My buddy just bought a YFZ. He going to get a pipe in the future, but in the mean time, he heard that removing the air box lid and re-jetting can help in power. If this is the case, what jetting changes need to be made. And..does it really give much of a power increase? We are in Ohio..about 1000 ft elevation.

 

pull the peashooter out and take the lid off. Run a 170 main with 45 pilot and 3rd clip on the gytr needle. This should get you started.

 

if you are higher up in altitude do you need a lower # main jet and pilot?

 

yes

 

I think the jetting stevendsm95gst just stated will work just fine at 1000ft. I would go with that. People are running bigger mains than that with the same set up at sea level & doing just fine. So go for it.

 

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Originally posted by: stevendsm95gst
pull the peashooter out and take the lid off. Run a 170 main with 45 pilot and 3rd clip on the gytr needle. This should get you started.
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Is the GYTR needle a different needle than whats on the stock carb set-up? Does pulling the pea-shooter out make it alot louder? Give any power gains?