Planet Minis

whighty450rider · 08-20-2008, 01:00 PM

hi, just got my vm26 today for my ogm140 and here are my symptoms. the choke cuts out the engine, it just dies, runs fine with no choke. if I gas it from idle it bogs for a while, then it picks up. top end seems to be okay but I think better jetting can do alot. Main jet is a #190 (seems a little big), pilot is a 22.5 (seems a little small), needle is at the 4th slot down. one more thing, what screw does what? there is one that sticks out from the side about 1/2 inch, there is also one that is very close to the air filter end. I just need to know which one is air/fuel screw, and which is idle. thanks for all the help.

Tunk31x · 08-20-2008, 01:30 PM

the one that sticks out the side a ways is your idle screw, it should possibly have a srping on it as well. the one next to the air filter i dont worry about. as far as your jets go, i have the same problem with my ogm, i just posted a thread asking someone if they have played with the jetting yet to figure out what they need to run. the problem you are having it is way to rich and drowning it out as well. thats what the choke is doing to cutting off air so there is a richer air to fuel ratio. i dont know what jet to use. i wish i had a kit i would try them all and let you know. i think i am going to try a 165 or 170 first. also your needle you want the clip all the way at the top of the needle this is goin to put the needle all the down into the carb letting less fuel come up from the bowl, therefore makeing it leaner, than as you find the right jet, move the needle clip down the needle until you fine the mixture that you want. i go by the spark plug, smell, and sound.

boonacka · 08-20-2008, 01:55 PM

set your needle clip in the middle. turn your airscrew 1.5 turns out. turn up your idle. start the bike and let it warm up. once warm, make sure the idle is high. now turn the airscrew in clockwise until the idle starts to drop. turn the airscrew back out until the revs pick up and remain steady.

the stock jets should work with the 140. if you dont have any other jets, adjust your needle clip.

AHPminis · 08-20-2008, 02:07 PM

That main is way too big for where we are (800 ft). I would run a 155 or even 145 on that setup here. Start with your clip in the middle with that main and fuel screw 1.5 turns out.

loopedout · 08-20-2008, 02:19 PM

dont mean to post whore but I just got a 140 that came with a molkt 26, vm 26 knock off, I think the alt is around 1200 here, any idea where to start with jets?

whighty450rider · 08-20-2008, 02:43 PM

Quote:

Originally Posted by AHPminis

That main is way too big for where we are (800 ft). I would run a 155 or even 145 on that setup here. Start with your clip in the middle with that main and fuel screw 1.5 turns out.

thats what I thought, when I first started it and revved it, there was some black smoke. I will go to the store tomorrow and see if I can pick up a 155. also the overflow tube for the float bowl is spilling gas, I made sure its not stuck, is there a way to fix this?

2wheeltyson · 08-20-2008, 03:13 PM

pm sent.

CJsDad · 08-20-2008, 03:31 PM

Quote:

Originally Posted by loopedout

dont mean to post whore but I just got a 140 that came with a molkt 26, vm 26 knock off, I think the alt is around 1200 here, any idea where to start with jets?

Try a 25 pilot jet and a 115 OKO main jet in the MOLKT. Air screw about a turn out.

whighty450rider · 08-20-2008, 06:44 PM

ok, played with it a little, needle all the way down and air/fuel screw 1 1/2 turns out. has great top end, but when I give it a lot of throttle at once while at idle it still bogs. Im still gonna put a smaller main in, but is the 22.5 pilot the problem? thanks for the help.

whighty450rider · 08-21-2008, 05:45 PM

ok, went to the store today and got a 150, still no luck. So I went back and got a 140, and a 25 pilot. Still poppin and doin some weird funky stuff, and the plug is BLACK. In the higher revs it pops too. Got the needle all the way down, and the screw about 4 or 5 turns out and still not performing the way I want it to. Should I get a 130 or a 125? or both? theyre only 3 bucks.

bf519 · 08-21-2008, 06:24 PM

keep going down on the main until the plug turns brown

whighty450rider · 08-23-2008, 11:05 AM

I went down all the way to a 110, and it still bogs a little when I give it alot of gas at once, but I think its a typical 4-stroke thing, my 450 does it too. right now Im running 110 mainjet, 25 pilot, needle all the way down, and 2 turns out on the screw. Problem is I still think its rich, and the local shop doesnt have less than a 110 mainjet. the plug is cleaning up a bit but its still blackish. Is it possible for it to be running rich with this jetting setup? or is something screwed up? Ill go to sudco and see if I can find a 100, but it seems like everyone else is running 140 and higher on their vm26's. So i guess my question is, should I keep going down on the mainjet? or should I play with the pilot? The top end is running great, but the bog in the low rpm's is leading me to believe its still rich.

Branyers · 08-23-2008, 11:37 AM

Why do you leave the needle at the lowest setting? Get the clip in the middle or your bottom end will continue to bog while your top end dangerously leans out.

I use a 185 main, 20 pilot with needle at middle position and my motor is only 124cc. Runs perfect set up this way.

whighty450rider · 08-23-2008, 02:29 PM

Quote:

Originally Posted by Branyers

Why do you leave the needle at the lowest setting? Get the clip in the middle or your bottom end will continue to bog while your top end dangerously leans out.

I use a 185 main, 20 pilot with needle at middle position and my motor is only 124cc. Runs perfect set up this way.

Good catch, I checked again and I was wrong, the needle is at the highest for best performance. So I guess I gotta go back through all my jets and try all of em again, and find which one works best when the needle is at the middle. If the needle is all the way up, then I gotta go richer on the mainjet right? I got 110, 120, 130, 140, 150, and 190 which do you suggest to go back to? thanks for the help.

Fastcat1! · 08-25-2008, 02:37 PM

If its popping on top it's because you are going too extreme and leaning the motor out. You definitely do not want to keep going down on the main. You are dealing with two different issues. The main jet should be around a 170 or even higher depending on the color of the plug. You need to get an accurate plug reading by having the motor warmed up and a sustained above middle-upper throttle rev. I recommend you ride it so as not to overheat sitting on the stand.

Your plug is most likely bogging on the bottom because your pilot it too big, thus
giving you a black plug and leading you to think your main is the problem. Try going down on the pilot to a 22.5 or 20

turbo38t · 08-25-2008, 02:43 PM

Hey Mark, why would an OGM 140 need a 145 or 150 main in the vm26 when my OGM 150 has a 102.5 stock? And you had me go even leaner. Just curious, wouldn't a 140 suck less fuel?All the guys I talked to at southwick were running between 115 and 135. Dave

Quote:

Originally Posted by AHPminis

That main is way too big for where we are (800 ft). I would run a 155 or even 145 on that setup here. Start with your clip in the middle with that main and fuel screw 1.5 turns out.

fatcaaat · 08-25-2008, 02:55 PM

DO you have a REAL Mikuni VM26 Carb or do you have a knockoff VM26 Carb. They take different main jets and therefore the numbers are not the same!

If you are running a REAL mikuni VM26 carb, you should wind up around 20-22.5 on the pilot and 140-170 on the main. Your air screw should never be more than 3 full turns out or you have the wrong pilot jet in there.

And putting your needle all the way up or down is a dead give away your jets are off.

So, do you have a REAL VM26 or a knockoff? Post pics of what main jets you are using if you don't know the difference.

whighty450rider · 08-26-2008, 09:44 AM

Quote:

Originally Posted by Fastcat1!

If its popping on top it's because you are going too extreme and leaning the motor out. You definitely do not want to keep going down on the main. You are dealing with two different issues. The main jet should be around a 170 or even higher depending on the color of the plug. You need to get an accurate plug reading by having the motor warmed up and a sustained above middle-upper throttle rev. I recommend you ride it so as not to overheat sitting on the stand.

Your plug is most likely bogging on the bottom because your pilot it too big, thus
giving you a black plug and leading you to think your main is the problem. Try going down on the pilot to a 22.5 or 20

I put the 150 back in, and have a 25 pilot, and the needle all the way up. I will go out today and buy a 160, 170, and 180, because those are the only ones I dont have. I will try the 170 first, with the 22.5 pilot that I already have, and the needle in the middle. see what that does.

magiksc · 08-26-2008, 09:54 AM

150s sound high but I guess its your locals. Cause here we never break the 120s thats.

fatcaaat · 08-26-2008, 10:08 AM

Quote:

Originally Posted by magiksc

150s sound high but I guess its your locals. Cause here we never break the 120s thats.

Again...different carbs. A real VM26 carb uses different jets which in turn use different numbers

A 120 in a REAL mikuni will be small for a stock 70cc at 2000ft and lower

For me...a 146cc jets about perfect on a mikuni vm26 at 22.5/180 at 2000 ft

08-20-2008, 01:00 PM	#1 (permalink)
whighty450rider 1st Gear Member Join Date: Jun 2008 Location: Michigan Posts: 145	vm26 jetting hi, just got my vm26 today for my ogm140 and here are my symptoms. the choke cuts out the engine, it just dies, runs fine with no choke. if I gas it from idle it bogs for a while, then it picks up. top end seems to be okay but I think better jetting can do alot. Main jet is a #190 (seems a little big), pilot is a 22.5 (seems a little small), needle is at the 4th slot down. one more thing, what screw does what? there is one that sticks out from the side about 1/2 inch, there is also one that is very close to the air filter end. I just need to know which one is air/fuel screw, and which is idle. thanks for all the help.

08-20-2008, 01:30 PM	#2 (permalink)
Tunk31x PM Newbie Join Date: Aug 2008 Location: Spokane,WA Posts: 9	Re: vm26 jetting the one that sticks out the side a ways is your idle screw, it should possibly have a srping on it as well. the one next to the air filter i dont worry about. as far as your jets go, i have the same problem with my ogm, i just posted a thread asking someone if they have played with the jetting yet to figure out what they need to run. the problem you are having it is way to rich and drowning it out as well. thats what the choke is doing to cutting off air so there is a richer air to fuel ratio. i dont know what jet to use. i wish i had a kit i would try them all and let you know. i think i am going to try a 165 or 170 first. also your needle you want the clip all the way at the top of the needle this is goin to put the needle all the down into the carb letting less fuel come up from the bowl, therefore makeing it leaner, than as you find the right jet, move the needle clip down the needle until you fine the mixture that you want. i go by the spark plug, smell, and sound.

08-20-2008, 01:55 PM	#3 (permalink)
boonacka 2nd Gear Member Join Date: Mar 2006 Location: DC MD VA motard Posts: 722	Re: vm26 jetting set your needle clip in the middle. turn your airscrew 1.5 turns out. turn up your idle. start the bike and let it warm up. once warm, make sure the idle is high. now turn the airscrew in clockwise until the idle starts to drop. turn the airscrew back out until the revs pick up and remain steady. the stock jets should work with the 140. if you dont have any other jets, adjust your needle clip.

08-20-2008, 02:07 PM	#4 (permalink)
AHPminis Advertiser Join Date: Aug 2004 Location: East Coast - PA Posts: 3,940	Re: vm26 jetting That main is way too big for where we are (800 ft). I would run a 155 or even 145 on that setup here. Start with your clip in the middle with that main and fuel screw 1.5 turns out. __________________ Website - www.ahpminis.com Email - mark@ahpminis.com AHP - TB -Sano - RB - Kitaco - iShock - Fox - Marzocchi - F50s - Utopia - Takegawa - Crower

08-20-2008, 02:19 PM	#5 (permalink)
loopedout 1st Gear Member Join Date: Jul 2008 Posts: 149	Re: vm26 jetting dont mean to post whore but I just got a 140 that came with a molkt 26, vm 26 knock off, I think the alt is around 1200 here, any idea where to start with jets?

08-20-2008, 03:13 PM	#7 (permalink)
2wheeltyson 3rd Gear Member Join Date: May 2005 Location: michigan Posts: 1,533	Re: vm26 jetting pm sent.

08-20-2008, 06:44 PM	#9 (permalink)
whighty450rider 1st Gear Member Join Date: Jun 2008 Location: Michigan Posts: 145	Re: vm26 jetting ok, played with it a little, needle all the way down and air/fuel screw 1 1/2 turns out. has great top end, but when I give it a lot of throttle at once while at idle it still bogs. Im still gonna put a smaller main in, but is the 22.5 pilot the problem? thanks for the help.

08-21-2008, 05:45 PM	#10 (permalink)
whighty450rider 1st Gear Member Join Date: Jun 2008 Location: Michigan Posts: 145	Re: vm26 jetting ok, went to the store today and got a 150, still no luck. So I went back and got a 140, and a 25 pilot. Still poppin and doin some weird funky stuff, and the plug is BLACK. In the higher revs it pops too. Got the needle all the way down, and the screw about 4 or 5 turns out and still not performing the way I want it to. Should I get a 130 or a 125? or both? theyre only 3 bucks. Last edited by whighty450rider; 08-23-2008 at 02:30 PM.

08-21-2008, 06:24 PM	#11 (permalink)
bf519 1st Gear Member Join Date: Jun 2005 Posts: 193	Re: vm26 jetting keep going down on the main until the plug turns brown

08-23-2008, 11:05 AM	#12 (permalink)
whighty450rider 1st Gear Member Join Date: Jun 2008 Location: Michigan Posts: 145	Re: vm26 jetting I went down all the way to a 110, and it still bogs a little when I give it alot of gas at once, but I think its a typical 4-stroke thing, my 450 does it too. right now Im running 110 mainjet, 25 pilot, needle all the way down, and 2 turns out on the screw. Problem is I still think its rich, and the local shop doesnt have less than a 110 mainjet. the plug is cleaning up a bit but its still blackish. Is it possible for it to be running rich with this jetting setup? or is something screwed up? Ill go to sudco and see if I can find a 100, but it seems like everyone else is running 140 and higher on their vm26's. So i guess my question is, should I keep going down on the mainjet? or should I play with the pilot? The top end is running great, but the bog in the low rpm's is leading me to believe its still rich. Last edited by whighty450rider; 08-23-2008 at 02:29 PM.

08-23-2008, 11:37 AM	#13 (permalink)
Branyers 1st Gear Member Join Date: Jul 2006 Posts: 119	Re: vm26 jetting Why do you leave the needle at the lowest setting? Get the clip in the middle or your bottom end will continue to bog while your top end dangerously leans out. I use a 185 main, 20 pilot with needle at middle position and my motor is only 124cc. Runs perfect set up this way.

08-25-2008, 02:37 PM	#15 (permalink)
Fastcat1! PM Newbie Join Date: Jun 2007 Location: Cortland, NY Posts: 27	Re: vm26 jetting If its popping on top it's because you are going too extreme and leaning the motor out. You definitely do not want to keep going down on the main. You are dealing with two different issues. The main jet should be around a 170 or even higher depending on the color of the plug. You need to get an accurate plug reading by having the motor warmed up and a sustained above middle-upper throttle rev. I recommend you ride it so as not to overheat sitting on the stand. Your plug is most likely bogging on the bottom because your pilot it too big, thus giving you a black plug and leading you to think your main is the problem. Try going down on the pilot to a 22.5 or 20

08-25-2008, 02:55 PM	#17 (permalink)
fatcaaat 3rd Gear Member Join Date: Sep 2004 Location: Arlington, VA Posts: 2,969	Re: vm26 jetting DO you have a REAL Mikuni VM26 Carb or do you have a knockoff VM26 Carb. They take different main jets and therefore the numbers are not the same! If you are running a REAL mikuni VM26 carb, you should wind up around 20-22.5 on the pilot and 140-170 on the main. Your air screw should never be more than 3 full turns out or you have the wrong pilot jet in there. And putting your needle all the way up or down is a dead give away your jets are off. So, do you have a REAL VM26 or a knockoff? Post pics of what main jets you are using if you don't know the difference.

08-26-2008, 09:54 AM	#19 (permalink)
magiksc Join Date: Oct 2006 Location: Somewhere between Heaven and Hell Posts: 2,445	Re: vm26 jetting 150s sound high but I guess its your locals. Cause here we never break the 120s thats.

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