Planet Minis

fatcaaat · 10-09-2008, 06:35 PM

Well, I never thought I'd actually write this, but compared to my Jialing 157 setup 57 bore and 61.5 stroke, I have to say that the GPX177 V2 is a bit of a disappointment.

I was expecting a significant power increase over this Jialing motor configuration...better acceleration, more grunt...but it is just not the case. My Jialing motor appears to outperform this on both acceleration and low level grunt. I have not done high-speed stuff yet, so that remains to be seen.

I also ran my Jialing with a Mikuni VM26 carb and this GPX is using the TB28. Do you think that is imparing it at all?

I guess I'll give it some time to see what happens. But I just thought I'd vent a little...

I think that once I get it broken in and I get my vintage racer built, I am going to go to a Dyno and have some pulls and see if it is true or if it is all in my head.

HACKMUNCH · 10-09-2008, 06:42 PM

what jets are you running?

fatcaaat · 10-09-2008, 06:44 PM

Quote:

Originally Posted by HACKMUNCH

what jets are you running?

Stock Pilot (50) and a 115 main. Stock main was 125

orracle · 10-09-2008, 06:48 PM

what gearing you running?

MAZZ77X · 10-09-2008, 06:48 PM

My stock YX 150 ran like a bear with a TB28mm with a 47 pilot and 125 main in the dead summer heat 90+*'s! I like to say you need more fuel

HACKMUNCH · 10-09-2008, 06:51 PM

try a 100 main. 177v2 ported head, runs like a raped ape. 50 pilot 100main tb 28. 800ft above sea level. more than likely your clutch is allready gone. we blew sams in 2 mins of riding, call pax and get the kevlars. wheelies in 3rd gear with 17/39 gearing.

fatcaaat · 10-09-2008, 06:51 PM

Quote:

Originally Posted by orracle

what gearing you running?

17/31...same gearing as I was running on my Jialing 157cc. I pulled the 157cc and replaced it directly with this.

fatcaaat · 10-09-2008, 06:54 PM

Quote:

Originally Posted by HACKMUNCH

try a 100 main. 177v2 ported head, runs like a raped ape. 50 pilot 100main tb 28. 800ft above sea level.

TBolt USA, LLC » Pitbike Engine Parts » CARB KITS » TB JET KIT 26MM/28MM OKO (smaller)

These are the jets I have and looks like I have the same setup as you. ANd I am about 300 ft above sea level. I'll try the 100 and see...

HACKMUNCH · 10-09-2008, 06:55 PM

Quote:

Originally Posted by fatcaaat

17/31...same gearing as I was running on my Jialing 157cc. I pulled the 157cc and replaced it directly with this.

no way is the stock plates gonna pull those gears unless it has a 10" rear.

brentley · 10-09-2008, 06:56 PM

I have one too. Wouldnt even run with the stock carb (Molktft). I put a Mikuni on and it ran ok, but was pretty unimpressed with the power. I expected at least a torquey low end but it was just kind of lame everywhere.

357 Racing · 10-09-2008, 06:57 PM

I thought you were going to run a 28mm pumper carb on it. I do see why you said you were dissapointed...

fatcaaat · 10-09-2008, 07:00 PM

THis CT70 has 10" wheels, but it is 120/90-10 which is the same diameter as a 120/70-12 or so. I have not gone on it enough to burn through clutches yet, but I assume that will be a problem. I'm just breaking it in real easy right now and will update to the kevlars for sure.

mototim · 10-09-2008, 07:05 PM

Who built your motor? That motor should be pretty damn fast, ive ridden a couple of those builds

357 Racing · 10-09-2008, 07:08 PM

Im pretty sure he built it himself like all of his other motors.

fatcaaat · 10-09-2008, 07:13 PM

Quote:

Originally Posted by mototim

Who built your motor? That motor should be pretty damn fast, ive ridden a couple of those builds

Yep...I've done it myself...just like the 50+ others I've built. Pretty sure its built correctly

.

After I get a new exhaust on it, I'll put some miles on it and we'll see what's going on.

357 Racing · 10-09-2008, 07:53 PM

Keep giving us updates along the way.

ssr motorsports · 10-09-2008, 08:23 PM

We picked up 1 hp going from a tb28 to a vm26 on our 165v2's

boonacka · 10-09-2008, 08:51 PM

Quote:

Originally Posted by ssr motorsports

We picked up 1 hp going from a tb28 to a vm26 on our 165v2's

where in the powerband?

HACKMUNCH · 10-10-2008, 03:12 AM

Quote:

Originally Posted by ssr motorsports

We picked up 1 hp going from a tb28 to a vm26 on our 165v2's

because of the jetting and needle.

TheCRKid · 10-10-2008, 05:08 AM

funny , like every other week someone calls raving about the v2 upgrade

10-09-2008, 06:35 PM	#1 (permalink)
fatcaaat 3rd Gear Member Join Date: Sep 2004 Location: Arlington, VA Posts: 2,970	GPX177 V2 Disappointment Well, I never thought I'd actually write this, but compared to my Jialing 157 setup 57 bore and 61.5 stroke, I have to say that the GPX177 V2 is a bit of a disappointment. I was expecting a significant power increase over this Jialing motor configuration...better acceleration, more grunt...but it is just not the case. My Jialing motor appears to outperform this on both acceleration and low level grunt. I have not done high-speed stuff yet, so that remains to be seen. I also ran my Jialing with a Mikuni VM26 carb and this GPX is using the TB28. Do you think that is imparing it at all? I guess I'll give it some time to see what happens. But I just thought I'd vent a little... I think that once I get it broken in and I get my vintage racer built, I am going to go to a Dyno and have some pulls and see if it is true or if it is all in my head.

10-09-2008, 06:42 PM	#2 (permalink)
HACKMUNCH 3rd Gear Member Join Date: Apr 2006 Location: BRUNSWICK OHIO Posts: 4,859	Re: GPX177 V2 Disappointment what jets are you running?

10-09-2008, 06:48 PM	#4 (permalink)
orracle 2nd Gear Member Join Date: Sep 2006 Location: Hudson, NH Posts: 640	Re: GPX177 V2 Disappointment what gearing you running?

10-09-2008, 06:48 PM	#5 (permalink)
MAZZ77X 3rd Gear Member Join Date: Oct 2006 Location: BLUEBERRY CAPITOL OF THE WORLD Hammonton N.J. Posts: 1,859	Re: GPX177 V2 Disappointment My stock YX 150 ran like a bear with a TB28mm with a 47 pilot and 125 main in the dead summer heat 90+*'s! I like to say you need more fuel

10-09-2008, 06:51 PM	#6 (permalink)
HACKMUNCH 3rd Gear Member Join Date: Apr 2006 Location: BRUNSWICK OHIO Posts: 4,859	Re: GPX177 V2 Disappointment try a 100 main. 177v2 ported head, runs like a raped ape. 50 pilot 100main tb 28. 800ft above sea level. more than likely your clutch is allready gone. we blew sams in 2 mins of riding, call pax and get the kevlars. wheelies in 3rd gear with 17/39 gearing. Last edited by HACKMUNCH; 10-09-2008 at 06:54 PM.

10-09-2008, 06:56 PM	#10 (permalink)
brentley 1st Gear Member Join Date: Mar 2006 Location: 425 area Posts: 204	Re: GPX177 V2 Disappointment I have one too. Wouldnt even run with the stock carb (Molktft). I put a Mikuni on and it ran ok, but was pretty unimpressed with the power. I expected at least a torquey low end but it was just kind of lame everywhere.

10-09-2008, 06:57 PM	#11 (permalink)
357 Racing 3rd Gear Member Join Date: Dec 2006 Location: Austin, Texas Posts: 3,573	Re: GPX177 V2 Disappointment I thought you were going to run a 28mm pumper carb on it. I do see why you said you were dissapointed...

10-09-2008, 07:00 PM	#12 (permalink)
fatcaaat 3rd Gear Member Join Date: Sep 2004 Location: Arlington, VA Posts: 2,970	Re: GPX177 V2 Disappointment THis CT70 has 10" wheels, but it is 120/90-10 which is the same diameter as a 120/70-12 or so. I have not gone on it enough to burn through clutches yet, but I assume that will be a problem. I'm just breaking it in real easy right now and will update to the kevlars for sure.

10-09-2008, 07:05 PM	#13 (permalink)
mototim 2nd Gear Member Join Date: Sep 2007 Location: so cal Posts: 310	Re: GPX177 V2 Disappointment Who built your motor? That motor should be pretty damn fast, ive ridden a couple of those builds

10-09-2008, 07:08 PM	#14 (permalink)
357 Racing 3rd Gear Member Join Date: Dec 2006 Location: Austin, Texas Posts: 3,573	Re: GPX177 V2 Disappointment Im pretty sure he built it himself like all of his other motors.

10-09-2008, 07:53 PM	#16 (permalink)
357 Racing 3rd Gear Member Join Date: Dec 2006 Location: Austin, Texas Posts: 3,573	Re: GPX177 V2 Disappointment Keep giving us updates along the way.

10-09-2008, 08:23 PM	#17 (permalink)
ssr motorsports Advertiser Join Date: Nov 2007 Posts: 101	Re: GPX177 V2 Disappointment We picked up 1 hp going from a tb28 to a vm26 on our 165v2's

10-10-2008, 05:08 AM	#20 (permalink)
TheCRKid Advertiser Join Date: Jan 2005 Posts: 3,773	Re: GPX177 V2 Disappointment funny , like every other week someone calls raving about the v2 upgrade __________________ T Bolt USA ALL top Pitbikes ,Engines and Parts for Pitbikes & Minis Website Contact THECRKID@TBOLTUSA.COM or Call 215-630-3554

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