Planet Minis

Kurlon · 09-17-2006, 09:45 AM

This FAQ is for all Import motors running a stock stroke of 52mm or longer. As you track down relevant info, post to the thread and I'll add it to the FAQ. For shorter stroke motors, there will be a separate FAQ.

Identification: There are many many different importers bringing over either crate motors, or entire bikes under a variety of labels. In most cases, the actual 'brand' of the motor can be traced back to a small group of producers in China. Generally speaking motors of a particular model number from a given producer will stick to a single common specification, so once you've identified your motor you can feel confidant ordering parts based on that ID.

Lately though with the larger displacement motors we're seeing variations even within a particular make and model of motor. Motors where inconsistencies have been observed that are more than just normal design updates over the life of a product will be noted. On these machines, you'll need to measure your machine specifically to determine which parts are appropriate.

Lifan - One of the most well known import brands. Like most manufacturers anyone can have a motor produced by Lifan with their name on the side, and some people buy Lifan side covers to slap on lessor motors so don't use those labels as reliable identifiers.
Identifying Marks

Known Lifan Motors
* SDG Pro Mini's '125' motor is basically a Lifan Monster 120 motor. This unit is a bit unique in that Lifan assigns SDG a unique model number rather than using their standard model number schema.
Jialing - Made 'famous' by GPX / Pitster Pro importing them with much fanfare starting in 2005.
Identifying Marks

Known Jialing Motors
* GPX 125
Zongshen - Runner up to Lifan and Jialing for brand recognition.
Identifying Marks

Known Zongshen Motors
* RCM bikes in 2005 and 2006 utilized Zongshen powerplants.
Loncin - Ebay favorite, no known 'big' import brands use this make of motor in their bikes, but many smaller brands do.
Identifying Marks

Known Loncin Motors

Ducar - Less seen than even Loncin, typically found on Ebay.
Identifying Marks

Known Ducar Motors

Faddybike - Produced in Thailand as a clone of the Honda Nice/Wave powerplant.
Identifying Marks

Known Faddybike Motors

Motor Specs: There are a few basic stats that help determine what parts will fit which motor. They also can help determine when you can 'borrow' bits from other motors to use as hop ups by cross referencing other machines with similar base specs.

To stay consistent, a few measurements will be based on the following giudelines when there is a chance for ambiguity:

Piston Pin Height: Measure from the TOP of the pin hole to the top of the outer edge of the piston. Some people measure to the middle of the pin hole, but this method allows or a direct read with a ruler or set of calipers making it simpler for others to check and compare.

Stud Spacing: Until a better way of quantifying stud spacing is developed, one motor will be designated as the 'reference' mill for a given stud pattern. All motors that are compatible will list that motor under stud spacing.

Lifan 'Monster' 120

Brand: Lifan
Bore: 52.4mm
Stroke: 55.5mm
Piston Pin: 14mm
Piston Pin Height: 12.8mm
Cylinder Height: 79mm
Stud Spacing: Lifan Monster Standard
Clutch: 4 disc primary mount
Oil Pump: Direct crank drive
Transmission: 4 speed, 1d3u or 4u depending on shift drum used
Countershaft: Coarse 17mm
Start in gear: Yes
Head: 27mm intake, 23mm exhaust, Honda CRF50 style cam

Zongshen 120

Brand: Zongshen
Bore: 52.4mm
Stroke: 55.5mm
Piston Pin: 14mm
Piston Pin Height:
Cylinder Height:
Stud Spacing:
Clutch:
Oil Pump:
Transmission: 4 speed
Countershaft: Coarse 17mm
Start in gear:
Head: 27mm intake, 23mm exhaust

Zongshen 124

Brand: Zongshen
Bore: 54mm
Stroke: 54mm
Piston Pin: 14mm
Piston Pin Height:
Cylinder Height:
Stud Spacing:
Clutch:
Oil Pump:
Transmission: 4 speed
Countershaft: Coarse 20mm
Start in gear: No
Head: 27mm intake, 23mm exhaust

'GPX' 125

Brand: Jialing
Bore: 52.4mm
Stroke: 57.5mm
Piston Pin: 13mm
Piston Pin Height: 13mm
Cylinder Height: 79mm
Stud Spacing: Lifan Monster Standard
Clutch: 5 disc primary mount
Oil Pump: Direct crank drive
Transmission: 4 speed, 1d3u or 4u depending on shift drum used
Countershaft: Coarse 17mm
Start in gear: Yes
Head: 23mm intake, 20mm exhaust, uses 'E22' style cam, short

Transmissions: There are a few variations on a common theme floating around in the gear boxes of various motors. Most all import big displacement mills run a 4 speed box with either an international shift (1d3u) or all up shift pattern.

Jialing
Gear Ratios
1st: 3.181
2nd: 1.705
3rd: 1.238
4th: 0.958
Shaft Sizes
Lifan 120/125
Gear Ratios

Shaft Sizes
Main Shaft: 17mm clutch side, 12mm sprocket side
Counter Shaft: 14mm or 15mm clutch side, 17mm sprocket side

Cams: Remember to verify valve to piston clearance, and valve to valve clearance whenever swapping cams around.

There are many cam specs HERE for comparison amongst the various offerings. You can thank Cyclerider for gathering most of that data.

Jialing 'small valve' head - Uses 'short' E22 style cams with a 3 bolt sprocket. Note that it's been reported later heads have altered geometry, causing valve to valve contact with long duration cams. G1 and G2 Crower grinds are reported to work with both older and newer batches of the Jialing small valve head. As yet no external method of telling old vs new heads apart has been reported. VERIFY valve to valve clearance before running an aftermarket cam!

Crower
Import G1 Grind

Import G2 Grind

Dr ATV
'Takegawa Z40' Grind

Lifan 'Monster' big valve head - Uses Honda CRF style cams. Note, it normally uses a 3 bolt 32 tooth cam sprocket, Honda cams use a 2 bolt pattern. If you use this head on a motor with a 16 tooth crank sprocket, you will need to source a 32 tooth 2 bolt cam sprocket to use Honda cams. Periodically check your cam sprocket for signs of excess wear where the cam cover thrust button contacts, or the inside thrust tab rubs.

Crower
CRF50 G1 Grind

CRF70 G1 Grind

CRF70 G2 Grind

Dr ATV
'Z40' Grind

'Z28' Grind

TBQ Race Grind

Honda TB
'Race Head' Cam

'Stock Head' Cam

Piston Kits: Yeah, right, you're going to leave YOUR's stock...

Countershaft Sprockets: It used to be simple, you just ordered front sprockets for an old Z50 and they'd fit... but some motors started shipping with larger countershafts, with require different sprockets that don't seem to match any existing motors. See which shaft type your motor takes in the specs section, then check out some of the available options.

Coarse 17mm - Aka old Z50
Dr ATV
12 to 17 tooth

12 to 18 tooth

Coarse 20mm - Lifan and Zongshen 54 x 54 motors
Dr ATV
16 and 17 tooth

14 and 15 tooth, may require modification

Common Issues: What to look forward to with your new motor, along with preventative steps or post gotcha fixes.

Clutches
Primary Shaft Mounted Manuals - There are two varieties you'll see, 4 disk and 5 disk, with Jialing being the only one shipping a 5 disk setup at this time.
Slipping Clutch - Put heavier springs in. The most common suggestion is to get a set of clutch springs for a Honda 1999 or later TRX90 and swap them in for better clutch feel and more grabbing power.

5 disk upgrade - Some have sucessfully transplanted a 5 disk clutch stack from a Jialing to other motors that initially had 4 disk setups. This requires modifying the clutch basket, removing material from the bottom of the tab cutouts so the new stack will fit in.

Kurlon · 09-21-2006, 09:13 AM

Thread cleaned, all info gleaned and added to the above.

Anyone got more info to add?

Macka · 09-22-2006, 03:35 PM

Lifan has a 124cc same as Zongshen. Same specs as you have listed so far for the same cc zonger. I will be able provide more specs in the near future.

FlackMagnet · 09-25-2006, 09:47 AM

Some more on the Zongshen:

Identification:
From what I have seen, all the Zongshens engine numbers start with ZS, in my case, ZS154FMI for my 125cc, then below it the identification number.

winston1192 · 10-08-2006, 02:07 PM

Just got a new Lifan 125 Monster

127.1cc
9.5 hp
55.5mm Stroke
54mm Bore
23mm Exhaust Valve
27mm Intake Valve

Start in any gear with 4 up transmission

Kurlon · 10-08-2006, 09:37 PM

Winston, have you actually measured the bore and stroke on that motor?

(And for reference, the Lifan 'Monster' tag refers to a specific Lifan 120 motor, all others are not monsters despite similar specs or bottom ends.)

winston1192 · 10-09-2006, 11:18 AM

No but here is a link to where i got it from

http://www.britishamericanmotorsport...n/lifan125.htm

Also on the side of the engine is 137cm3 dont no if that is any help

Kurlon · 10-09-2006, 12:32 PM

So, fun question is weather or not that bore kit was installed at build time by Lifan or by the shop selling the motor... If you get a chance, crack into that mill, get some pics, and take some measurements. : )

chiribomb · 10-17-2006, 09:51 PM

kurlon,
Do you know the history of the 120 or a link, whats a honda nice, this is a chinese clone of the honda?
Here is my lifan 120 or 125 piston specs

40mm tall
52.4 dia
14mm pin
pin center to dome top 22.5mm
pin center to skirt 17.5mm
pin center to oil scraper 8.25mm center to center
pin center to oil ring 12.25 mm
pin center to compression ring 15.25 mm
the valve relief are 3mm deep

Kurlon · 10-18-2006, 06:07 AM

Unfortunately I don't have the history of the Lifan mills.

The Honda Nice is a motor Honda had built in Thailand for scooters in Thailand that have since been discontinued. It's a popular motor to build because it's damn rugged, easily builds out to 160cc, and parts are still available direct from Honda. The downside, you generally have to get one that was used in Thailand and 'rebuilt' by one of the local scooter shops who don't use what we'd consider best practices. So after spending a large chunk of change to get one, you have to turn around and spend more to bring it back to spec.

chiribomb · 10-26-2006, 12:04 AM

Kurlon here are con rod specs for the 55.5 x 52.4 motor.
25mm x 39mm rod pin.
14mm piston pin.
100mm rod length center to center.

you got a gpx rod, need to know the dims?

What about the piston height, pin to dome top?

Pat Farsole · 11-24-2006, 03:40 AM

Quote:

Originally Posted by Kurlon

So, fun question is weather or not that bore kit was installed at build time by Lifan or by the shop selling the motor... If you get a chance, crack into that mill, get some pics, and take some measurements. : )

I bought one Lifan B/Valve kick in gear engine (1P52FMI) with 124 cc on the cylinder and pulled it down to find that it had a 52.4 bore x 55.5 stroke (119.73590666161965 cc) The output shaft has a 17 mm coarse spline :

and another Lifan B/valve kick in gear engine (1P54FMI) with 138 cc on the cylinder that is 54 mm bore x 55.5 stroke (127.15965846442622 cc) :

and I also have another Lifan B/valve crank clutch motor (1P54FMI) that has 138 on the cylinder , that I suspect is a 54 bore x 54 stroke (123.72291093836067 cc) but I'll be able to find out now (thanks to the info in this thread) , by checking the diameter of the countershaft .

I checked the countershaft and it has a 20 mm coarse spline .

Apparently , they have a taller 1st gear ratio than the kick in gear Lifans . Here are the specs of them :

Specifications:
Single cylinder, 4-stroke, 2 valves, OHC racing head, air cooled, 125cc
Bore x Stroke: 54mm x 54mm, this is a 'square' engine for best balance between power and torque
Valve Sizes: 27mm intake, 23mm exhaust
Displacement: 123.7cc
Compression Ratio: 9.47:1
Gear Ratios: 1st 2.833:1, 2nd 1.706:1, 3rd 1.238:1, 4th 0.958:1

This is the same as the (1P54FMI) "138" Lifan crank clutch engine and has the same type of flywheel cover !
http://cgi.ebay.com.au/ws/eBayISAPI....ype=osi_widget

They are also selling 140's with 55 bore x 59 stroke on ebay OZ :

http://cgi.ebay.com.au/ws/eBayISAPI....8492&rd=1&rd=1

Kurlon · 11-24-2006, 06:01 AM

Interesting, where did you get the gearbox data? That's a much closer ratio setup that I'm using to seeing in an import mill.

jkline805 · 12-04-2006, 07:54 PM

hey i have the same Lifan big valve with the 124cm3 on the cylinder that turned out to be a 52.4x55mm, but the funny thing is, my engine # is 156FMI. I dont think that you can trust any of the markings on the cylinder and apparently not the model # either. oh well.

ghostryder · 12-08-2006, 05:27 PM

I have 2 china 110's that from exterior measurments are the same, both are stamped as 107's one is my oldest sons, one is my daughters. I just recently bought another. Its an ebay special I got very, very cheap. Its stamped 107 but the cylinder appears to be close to 1 inch longer and 1 inch narrower than the other two. The kids bikes run really well and are semi auto's, this new one is gutless as can be and is a manual clutch. I bought it hoping to sell it for a small profit but if that doesnt happen will integrate it into the family and definately want to pep it up. I didnt realize the china 110's could be so different. Any clue which one this new one is. The old ones appear to be fairly square(bore x stroke) from the outside, this new one is more rectangular.

TRT · 12-08-2006, 05:36 PM

Here's one for ya...
I tore apart a 124cc only to find that it's stroke was only 49.5 and bore 52.4...

Thats not the unusual part though. The cyllinder was actuallly 78mm tall...Figure that one out. Most 110cc based engines 107,108.. have the 69mm tall cylinder with the 49.5 stroke and 52.4 mm bore.....????????Hmmm

Troy

Pat Farsole · 12-26-2006, 07:14 PM

Quote:

Originally Posted by Kurlon

Interesting, where did you get the gearbox data? That's a much closer ratio setup that I'm using to seeing in an import mill.

It's on the ebay listing under engine specs . Whether it can be trusted or not I don't know . What I can do is mark the flywheel and countershaft sprocket and count the flywheel turns to each C/S sprocket turn in each gear .

http://cgi.ebay.com.au/ws/eBayISAPI....ype=osi_widget

Z50King · 12-26-2006, 11:44 PM

i have some info on the Loncin 107(called a 110) 3 valve engine.

VIN id numbers:

#.) VIN= engine id
1.2.) LC= Loncin
3.) 1= single cylinder
4.5.) 52= rounded off for bore size of 52
and then i think the rest of it is all engine# from the run

mine says on the Ohalee website that its a 52.4x49.5

it is a 3 valve with two intakes and 1 exhaust.
also has a left-side cam chain and sprocket.

Identifying marks are:

"Loncin" on the left-side cover, as well as "Designed in Japan" curved underneath it.
"3valve" on both the upper tappet and the cam side cover

ill post some more specs if i take it apart

Z50King · 01-11-2007, 12:12 AM

the last three numbers on the top row,

FAH or FMH

A = automatic clutch
M = manual clutch

i dont think anyone knows what F or H mean

Pat Farsole · 01-12-2007, 08:23 AM

Quote:

Originally Posted by Kurlon

Winston, have you actually measured the bore and stroke on that motor?

(And for reference, the Lifan 'Monster' tag refers to a specific Lifan 120 motor, all others are not monsters despite similar specs or bottom ends.)

Kurlon is dead right . The actual 120 monster Lifan has ports that are larger (wider) , smoother and cleaner finished inside and the casting around the guide is larger diameter than the later "R" type big valve heads .

09-17-2006, 09:45 AM	#1 (permalink)
Kurlon Super Moderator Join Date: Feb 2005 Location: Windham, ME Posts: 7,555	Import Motor FAQ - Long Stroke Mills This FAQ is for all Import motors running a stock stroke of 52mm or longer. As you track down relevant info, post to the thread and I'll add it to the FAQ. For shorter stroke motors, there will be a separate FAQ. Identification: There are many many different importers bringing over either crate motors, or entire bikes under a variety of labels. In most cases, the actual 'brand' of the motor can be traced back to a small group of producers in China. Generally speaking motors of a particular model number from a given producer will stick to a single common specification, so once you've identified your motor you can feel confidant ordering parts based on that ID. Lately though with the larger displacement motors we're seeing variations even within a particular make and model of motor. Motors where inconsistencies have been observed that are more than just normal design updates over the life of a product will be noted. On these machines, you'll need to measure your machine specifically to determine which parts are appropriate. Lifan - One of the most well known import brands. Like most manufacturers anyone can have a motor produced by Lifan with their name on the side, and some people buy Lifan side covers to slap on lessor motors so don't use those labels as reliable identifiers. Identifying Marks Known Lifan Motors * SDG Pro Mini's '125' motor is basically a Lifan Monster 120 motor. This unit is a bit unique in that Lifan assigns SDG a unique model number rather than using their standard model number schema. Jialing - Made 'famous' by GPX / Pitster Pro importing them with much fanfare starting in 2005. Identifying Marks Known Jialing Motors * GPX 125 Zongshen - Runner up to Lifan and Jialing for brand recognition. Identifying Marks Known Zongshen Motors * RCM bikes in 2005 and 2006 utilized Zongshen powerplants. Loncin - Ebay favorite, no known 'big' import brands use this make of motor in their bikes, but many smaller brands do. Identifying Marks Known Loncin Motors Ducar - Less seen than even Loncin, typically found on Ebay. Identifying Marks Known Ducar Motors Faddybike - Produced in Thailand as a clone of the Honda Nice/Wave powerplant. Identifying Marks Known Faddybike Motors Motor Specs: There are a few basic stats that help determine what parts will fit which motor. They also can help determine when you can 'borrow' bits from other motors to use as hop ups by cross referencing other machines with similar base specs. To stay consistent, a few measurements will be based on the following giudelines when there is a chance for ambiguity: Piston Pin Height: Measure from the TOP of the pin hole to the top of the outer edge of the piston. Some people measure to the middle of the pin hole, but this method allows or a direct read with a ruler or set of calipers making it simpler for others to check and compare. Stud Spacing: Until a better way of quantifying stud spacing is developed, one motor will be designated as the 'reference' mill for a given stud pattern. All motors that are compatible will list that motor under stud spacing. Lifan 'Monster' 120 Brand: Lifan Bore: 52.4mm Stroke: 55.5mm Piston Pin: 14mm Piston Pin Height: 12.8mm Cylinder Height: 79mm Stud Spacing: Lifan Monster Standard Clutch: 4 disc primary mount Oil Pump: Direct crank drive Transmission: 4 speed, 1d3u or 4u depending on shift drum used Countershaft: Coarse 17mm Start in gear: Yes Head: 27mm intake, 23mm exhaust, Honda CRF50 style cam Zongshen 120 Brand: Zongshen Bore: 52.4mm Stroke: 55.5mm Piston Pin: 14mm Piston Pin Height: Cylinder Height: Stud Spacing: Clutch: Oil Pump: Transmission: 4 speed Countershaft: Coarse 17mm Start in gear: Head: 27mm intake, 23mm exhaust Zongshen 124 Brand: Zongshen Bore: 54mm Stroke: 54mm Piston Pin: 14mm Piston Pin Height: Cylinder Height: Stud Spacing: Clutch: Oil Pump: Transmission: 4 speed Countershaft: Coarse 20mm Start in gear: No Head: 27mm intake, 23mm exhaust 'GPX' 125 Brand: Jialing Bore: 52.4mm Stroke: 57.5mm Piston Pin: 13mm Piston Pin Height: 13mm Cylinder Height: 79mm Stud Spacing: Lifan Monster Standard Clutch: 5 disc primary mount Oil Pump: Direct crank drive Transmission: 4 speed, 1d3u or 4u depending on shift drum used Countershaft: Coarse 17mm Start in gear: Yes Head: 23mm intake, 20mm exhaust, uses 'E22' style cam, short Transmissions: There are a few variations on a common theme floating around in the gear boxes of various motors. Most all import big displacement mills run a 4 speed box with either an international shift (1d3u) or all up shift pattern. Jialing Gear Ratios 1st: 3.181 2nd: 1.705 3rd: 1.238 4th: 0.958 Shaft Sizes Lifan 120/125 Gear Ratios Shaft Sizes Main Shaft: 17mm clutch side, 12mm sprocket side Counter Shaft: 14mm or 15mm clutch side, 17mm sprocket side Cams: Remember to verify valve to piston clearance, and valve to valve clearance whenever swapping cams around. There are many cam specs HERE for comparison amongst the various offerings. You can thank Cyclerider for gathering most of that data. Jialing 'small valve' head - Uses 'short' E22 style cams with a 3 bolt sprocket. Note that it's been reported later heads have altered geometry, causing valve to valve contact with long duration cams. G1 and G2 Crower grinds are reported to work with both older and newer batches of the Jialing small valve head. As yet no external method of telling old vs new heads apart has been reported. VERIFY valve to valve clearance before running an aftermarket cam! Crower Import G1 Grind Import G2 Grind Dr ATV 'Takegawa Z40' Grind Lifan 'Monster' big valve head - Uses Honda CRF style cams. Note, it normally uses a 3 bolt 32 tooth cam sprocket, Honda cams use a 2 bolt pattern. If you use this head on a motor with a 16 tooth crank sprocket, you will need to source a 32 tooth 2 bolt cam sprocket to use Honda cams. Periodically check your cam sprocket for signs of excess wear where the cam cover thrust button contacts, or the inside thrust tab rubs. Crower CRF50 G1 Grind CRF70 G1 Grind CRF70 G2 Grind Dr ATV 'Z40' Grind 'Z28' Grind TBQ Race Grind Honda TB 'Race Head' Cam 'Stock Head' Cam Piston Kits: Yeah, right, you're going to leave YOUR's stock... Countershaft Sprockets: It used to be simple, you just ordered front sprockets for an old Z50 and they'd fit... but some motors started shipping with larger countershafts, with require different sprockets that don't seem to match any existing motors. See which shaft type your motor takes in the specs section, then check out some of the available options. Coarse 17mm - Aka old Z50 Dr ATV 12 to 17 tooth 12 to 18 tooth Coarse 20mm - Lifan and Zongshen 54 x 54 motors Dr ATV 16 and 17 tooth 14 and 15 tooth, may require modification Common Issues: What to look forward to with your new motor, along with preventative steps or post gotcha fixes. Clutches Primary Shaft Mounted Manuals - There are two varieties you'll see, 4 disk and 5 disk, with Jialing being the only one shipping a 5 disk setup at this time. Slipping Clutch - Put heavier springs in. The most common suggestion is to get a set of clutch springs for a Honda 1999 or later TRX90 and swap them in for better clutch feel and more grabbing power. 5 disk upgrade - Some have sucessfully transplanted a 5 disk clutch stack from a Jialing to other motors that initially had 4 disk setups. This requires modifying the clutch basket, removing material from the bottom of the tab cutouts so the new stack will fit in. __________________ http://www.x386.net/TTR 2004 ST3 - 'Duckie'?!?! 2005 CRF70RR - MiniGP Weapon 2005 CRF70 - Dirt Donk 2008 Pitster Pro X4 Motard 1991 GS500E - LRRS/CCS #771 Last edited by Kurlon; 11-22-2006 at 11:16 AM.

09-21-2006, 09:13 AM	#2 (permalink)
Kurlon Super Moderator Join Date: Feb 2005 Location: Windham, ME Posts: 7,555	Thread cleaned, all info gleaned and added to the above. Anyone got more info to add? __________________ http://www.x386.net/TTR 2004 ST3 - 'Duckie'?!?! 2005 CRF70RR - MiniGP Weapon 2005 CRF70 - Dirt Donk 2008 Pitster Pro X4 Motard 1991 GS500E - LRRS/CCS #771

10-08-2006, 09:37 PM	#6 (permalink)
Kurlon Super Moderator Join Date: Feb 2005 Location: Windham, ME Posts: 7,555	Winston, have you actually measured the bore and stroke on that motor? (And for reference, the Lifan 'Monster' tag refers to a specific Lifan 120 motor, all others are not monsters despite similar specs or bottom ends.) __________________ http://www.x386.net/TTR 2004 ST3 - 'Duckie'?!?! 2005 CRF70RR - MiniGP Weapon 2005 CRF70 - Dirt Donk 2008 Pitster Pro X4 Motard 1991 GS500E - LRRS/CCS #771

10-09-2006, 12:32 PM	#8 (permalink)
Kurlon Super Moderator Join Date: Feb 2005 Location: Windham, ME Posts: 7,555	So, fun question is weather or not that bore kit was installed at build time by Lifan or by the shop selling the motor... If you get a chance, crack into that mill, get some pics, and take some measurements. : ) __________________ http://www.x386.net/TTR 2004 ST3 - 'Duckie'?!?! 2005 CRF70RR - MiniGP Weapon 2005 CRF70 - Dirt Donk 2008 Pitster Pro X4 Motard 1991 GS500E - LRRS/CCS #771

10-17-2006, 09:51 PM	#9 (permalink)
chiribomb 1st Gear Member Join Date: Dec 2005 Posts: 117	kurlon, Do you know the history of the 120 or a link, whats a honda nice, this is a chinese clone of the honda? Here is my lifan 120 or 125 piston specs 40mm tall 52.4 dia 14mm pin pin center to dome top 22.5mm pin center to skirt 17.5mm pin center to oil scraper 8.25mm center to center pin center to oil ring 12.25 mm pin center to compression ring 15.25 mm the valve relief are 3mm deep Last edited by chiribomb; 10-17-2006 at 11:30 PM.

09-22-2006, 03:35 PM	#3 (permalink)
Macka 2nd Gear Member Join Date: May 2006 Location: Australia Posts: 252	Lifan has a 124cc same as Zongshen. Same specs as you have listed so far for the same cc zonger. I will be able provide more specs in the near future.

09-25-2006, 09:47 AM	#4 (permalink)
FlackMagnet PM Newbie Join Date: Jul 2006 Location: San Diego Posts: 91	Some more on the Zongshen: Identification: From what I have seen, all the Zongshens engine numbers start with ZS, in my case, ZS154FMI for my 125cc, then below it the identification number.

10-08-2006, 02:07 PM	#5 (permalink)
winston1192 PM Newbie Join Date: May 2006 Location: East Yorkshire, UK Posts: 18	Just got a new Lifan 125 Monster 127.1cc 9.5 hp 55.5mm Stroke 54mm Bore 23mm Exhaust Valve 27mm Intake Valve Start in any gear with 4 up transmission

10-09-2006, 11:18 AM	#7 (permalink)
winston1192 PM Newbie Join Date: May 2006 Location: East Yorkshire, UK Posts: 18	No but here is a link to where i got it from http://www.britishamericanmotorsport...n/lifan125.htm Also on the side of the engine is 137cm3 dont no if that is any help

10-18-2006, 06:07 AM	#10 (permalink)
Kurlon Super Moderator Join Date: Feb 2005 Location: Windham, ME Posts: 7,555	Unfortunately I don't have the history of the Lifan mills. The Honda Nice is a motor Honda had built in Thailand for scooters in Thailand that have since been discontinued. It's a popular motor to build because it's damn rugged, easily builds out to 160cc, and parts are still available direct from Honda. The downside, you generally have to get one that was used in Thailand and 'rebuilt' by one of the local scooter shops who don't use what we'd consider best practices. So after spending a large chunk of change to get one, you have to turn around and spend more to bring it back to spec. __________________ http://www.x386.net/TTR 2004 ST3 - 'Duckie'?!?! 2005 CRF70RR - MiniGP Weapon 2005 CRF70 - Dirt Donk 2008 Pitster Pro X4 Motard 1991 GS500E - LRRS/CCS #771

10-26-2006, 12:04 AM	#11 (permalink)
chiribomb 1st Gear Member Join Date: Dec 2005 Posts: 117	Kurlon here are con rod specs for the 55.5 x 52.4 motor. 25mm x 39mm rod pin. 14mm piston pin. 100mm rod length center to center. you got a gpx rod, need to know the dims? What about the piston height, pin to dome top? Last edited by chiribomb; 12-05-2006 at 05:26 PM.

11-24-2006, 06:01 AM	#13 (permalink)
Kurlon Super Moderator Join Date: Feb 2005 Location: Windham, ME Posts: 7,555	Interesting, where did you get the gearbox data? That's a much closer ratio setup that I'm using to seeing in an import mill.

12-04-2006, 07:54 PM	#14 (permalink)
jkline805 2nd Gear Member Join Date: Apr 2006 Location: Northfield, Minnesota Posts: 651	hey i have the same Lifan big valve with the 124cm3 on the cylinder that turned out to be a 52.4x55mm, but the funny thing is, my engine # is 156FMI. I dont think that you can trust any of the markings on the cylinder and apparently not the model # either. oh well.

12-08-2006, 05:27 PM	#15 (permalink)
ghostryder 2nd Gear Member Join Date: Jan 2006 Location: northern california Posts: 917	I have 2 china 110's that from exterior measurments are the same, both are stamped as 107's one is my oldest sons, one is my daughters. I just recently bought another. Its an ebay special I got very, very cheap. Its stamped 107 but the cylinder appears to be close to 1 inch longer and 1 inch narrower than the other two. The kids bikes run really well and are semi auto's, this new one is gutless as can be and is a manual clutch. I bought it hoping to sell it for a small profit but if that doesnt happen will integrate it into the family and definately want to pep it up. I didnt realize the china 110's could be so different. Any clue which one this new one is. The old ones appear to be fairly square(bore x stroke) from the outside, this new one is more rectangular.

12-08-2006, 05:36 PM	#16 (permalink)
TRT 3rd Gear Member Join Date: Nov 2005 Location: Detroit,MI Posts: 1,753	Here's one for ya... I tore apart a 124cc only to find that it's stroke was only 49.5 and bore 52.4... Thats not the unusual part though. The cyllinder was actuallly 78mm tall...Figure that one out. Most 110cc based engines 107,108.. have the 69mm tall cylinder with the 49.5 stroke and 52.4 mm bore.....????????Hmmm Troy

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12-26-2006, 11:44 PM	#18 (permalink)
Z50King Almost Banned Join Date: Sep 2004 Location: Upland, Ca Posts: 6,608	i have some info on the Loncin 107(called a 110) 3 valve engine. VIN id numbers: #.) VIN= engine id 1.2.) LC= Loncin 3.) 1= single cylinder 4.5.) 52= rounded off for bore size of 52 and then i think the rest of it is all engine# from the run mine says on the Ohalee website that its a 52.4x49.5 it is a 3 valve with two intakes and 1 exhaust. also has a left-side cam chain and sprocket. Identifying marks are: "Loncin" on the left-side cover, as well as "Designed in Japan" curved underneath it. "3valve" on both the upper tappet and the cam side cover ill post some more specs if i take it apart Last edited by Z50King; 01-11-2007 at 12:11 AM.

01-11-2007, 12:12 AM	#19 (permalink)
Z50King Almost Banned Join Date: Sep 2004 Location: Upland, Ca Posts: 6,608	the last three numbers on the top row, FAH or FMH A = automatic clutch M = manual clutch i dont think anyone knows what F or H mean