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.
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Best Crasher Yet!
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.
Senior Member
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
08 kfx 450r
Phoenix Performance Pipe
Fuel customs Intake
Dyna tek FI controller
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