Try adjusting the air screw first. If the carb im thinking of, Its underside in the front of the floatbowl. Id try going in first. That carb is really small for that engine.

 

Also try raising the needle one spot.. (Richen it up a little)

 

Also try raising the needle one spot.. (Richen it up a little)

When you say raising the needle is taking the e clip off and moving it down 1 position? I already moved that (today) and the screw mid way up on the exhaust side is what? Sorry I am really confused when it comes to carbs. I saw one screw at the bottom of the bowl but dont think it is the right screw.

 

with moving the needle up it seemed to run better but it is still cutting out a little.

 

is it a REAL Mikuni 22 or one of them knock offs........the knock offs are hit or miss but mostly miss

 

is it a REAL Mikuni 22 or one of them knock offs........the knock offs are hit or miss but mostly miss

What do you look at to know if its real or knockoff.

 

clone

 

I dont know what they come with. I bought a few motors but upgraded the carbs on them. the one that came with the little original carb I think a 22,says Mikuni. Has the air screw under the front of the bowl where you cant get to it. Mine was never used sitting on shelf where it will probably be for a long time. Usually in on the air screw helps. How dose it run when its cold "the motor" better or worse?

 

The carbs are fine, usually. Millions of them out there, on all sorts of engines. Sure, a $110 VM26 would make a bit more top end power, but not be easier to tune, or be included with a $329 engine kit



Adjusting the fuel screw is easy, with a shortened eyeglass screwdriver, modded roofing nail, 90-degree driver, flex-driver. Out for richer.

 

I dont know what they come with. I bought a few motors but upgraded the carbs on them. the one that came with the little original carb I think a 22,says Mikuni. Has the air screw under the front of the bowl where you cant get to it. Mine was never used sitting on shelf where it will probably be for a long time. Usually in on the air screw helps. How dose it run when its cold "the motor" better or worse?

I adjusted it all over the place yesterday and at one point I had it running awesome and then shut it off and came out a couple hours later to ride it again and it was missing out running cold. As it warmed up it started running alot better then my rear caliper locked up so have to fix that before I can try anything else.

 

make sure all your intake to carb and intake to head bolts are snug so you dont have an air leak also clean and oil you air filter (foam type)



if it wont come off an idle clean it could be to lean on the pilot

 

The 22mm carb is too small no matter what you do with jetting.



We purchased the Pirahna yx140 and experienced the same problem - we bought the VM26 & Uni pod filter and installed it using the stock jets - then a little fine tuning with a/f screw & idle.



My son races a 50 size frame with this motor, he say's "this thing rips".



Good luck!

 

I adjusted it all over the place yesterday and at one point I had it running awesome and then shut it off and came out a couple hours later to ride it again and it was missing out running cold. As it warmed up it started running alot better then my rear caliper locked up so have to fix that before I can try anything else.

If it runs better hot than it is lean for sure. I didnt know that screw was a FUEL screw,on most carbs the only outside mixture is usually a air screw. I never used mine. T-Bolt got me a pe28, REAL carb. He stocks them.

 

Thanks for all the advice I am just gonna have to find a better carb.

 

yeah good idea. FPM know his stuff.

 

I adjusted it all over the place yesterday and at one point I had it running awesome and then shut it off and came out a couple hours later to ride it again and it was missing out running cold. As it warmed up it started running alot better then my rear caliper locked up so have to fix that before I can try anything else.

Yep, that sounds lean. If you can't get it sorted, I'll give you credit towards a VM26, also real and stocked @FPM, and a much better match for a 140 than an also-stocked PE28. You'll have to turn the right screw in the right direction, though In front of the slide is typically a fuel screw, behind is typically air. Most street carbs have the more accurate fuel screw.

 

Thanks for all the advice I am just gonna have to find a better carb.

Can still go out today.

 

Yep, that sounds lean. If you can't get it sorted, I'll give you credit towards a VM26, also real and stocked @FPM, and a much better match for a 140 than an also-stocked PE28. You'll have to turn the right screw in the right direction, though In front of the slide is typically a fuel screw, behind is typically air. Most street carbs have the more accurate fuel screw.

What does the VM26 run?

 

What does the VM26 run?

$109, less trade-in.