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jack_h

Sherco 250 Carb Setup

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I have just bought a 2016 Sherco 250 and it seems to be running a little rich and smoking a bit. Checking the mixture screw on the Keihin carb it is only half a turn out. Is this about right for this bike / carb set up?

I am running the fuel mixture at 70:1.

Thanks for any help!

Jack

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It could be that the air screw is in too far. One and a half turns to two and a half turns out from fully in is the normal adjustment range, providing somebody hasn't faffed with jetting. On a used bike I would check the jet sizes are standard and it has a clean air filter. 

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From experience with that bike new,  mixture screw was rich,  needle was lean,  drop needle clip,  richen mixture screw... 100:1 I find is plenty of oil

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For this bike and carb, I can say mixture screw range can be something from 1/4 to 1 turn....weired but true.

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