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View Full Version : YFZ w/ FMF and K&N, what jet?



pbell75
02-13-2004, 01:39 PM
What jet should be used in this bike. It's a yfz with a FMF pipe, has run fine. last night added a K&N Airfilter and it's back firing. I think it has a 165 in it now.

Maxx_Action
02-13-2004, 02:09 PM
Hey...

dependant on where you have the needle set, in this weather for where you are you could easily be running a 170 with that set up. Some people may say even more. But if it is backfiring on Decel, it's a Pilot/Fuel screw issue. Up your pilot to a 45 and start at about 2 and a half turns. Up your main to a 170-172 maybe cause of the cold and you should be fine.

Maxx