Jetting, again...

[Thomas R]

Sorry but i just can't get my bike to idel. I is a MC250 from '00 main jet is 175 and pilot is now 45, i tried to switch my 38 pilot to the 45, with absolutly no effekt what so ever. It still is way to slow in idel. The idel screw i fully in, stil the same, i can hold it a idel with a realy small amount of gass on the throtle. What to do..

[desertgasser300]

Originally Posted by Thomas R

Sorry but i just can't get my bike to idel. I is a MC250 from '00 main jet is 175 and pilot is now 45, i tried to switch my 38 pilot to the 45, with absolutly no effekt what so ever. It still is way to slow in idel. The idel screw i fully in, stil the same, i can hold it a idel with a realy small amount of gass on the throtle. What to do..

Have you checked your float height? And has the carb ever been rebuilt? May have a small air leak somewhere?

[Thomas R]

I have not cheked the float hight, but completly disasembly and cleaned. Would a wrong float hight not make it run bad, only thing is the missing/too low idel. And some spool, but i still drive as a old lady, so that is to be expekted. :")

[Thomas R]

Do you by any chanse know the float hight, or is i just paralel.

[desertgasser300]

Originally Posted by Thomas R

I have not cheked the float hight, but completly disasembly and cleaned. Would a wrong float hight not make it run bad, only thing is the missing/too low idel. And some spool, but i still drive as a old lady, so that is to be expekted. :")

http://www.gasgasrider.org/forum/sho...t=float+height

[Thomas R]

Thanks, i will try that.

[Thomas R]

By the way as i read it pilot jet is from idel to about 1/4 throtle, and with my extra spool with the 45 it might be a good idea going back to the 38 one, yes it is a small track and I'm just learning to fly. And since it did not change anything to switch in the first place..

[Capz85]

I had a similar thing with my bike, it's simple I know but you should check.
My throttle cable adjuster had turned out a couple of turns putting slight tension on the throttle so the idle screw did pretty much nothing

Stupid but simple fix

Hope it's the same for you

[webmaster]

The symptoms you describe indicate that it is pulling over. This is where needle/nozzle is supplying too much fuel at low end and swamps out the idle fuel circuit.

The problem is the needle that is supplied by the factory. Depending on year, this is n1ef or something similar. It is garbage.

With a bike with more time on it the nozzle will wear and make bike very difficult to jet and work well.

If you do rb designs carb mod ron was offering replacement of the nozzle. He is very meticulous and machines a new nozzle....

For folks in North america - Two things I would have at the top of my list are rb designs head work to dial in the squish. Then his carb mod second. The carb mod fixes the inherent insensitivity in the idle circuit.

The head work is, by far, the biggest bang for the buck.

Jeff

[memphis2857]

Go to a 40 pilot and drop your needle one clip then reevaluate. With it being a 15 year old bike the carb probably has lots of wear. How does it run at half throttle?


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