New pipe jetting advice

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  • Pooley

Posted July 05, 2008 - 11:06 AM


This is my bike:
Year: 2001
Model (400 - 426 - 450): Yamaha WR 426
Cam Timing (WR/YZ): WR timed
Main jet: 168
Pilot Jet: 45
PAJ: 100
Leak Jet: NA
Starter Jet: 65
Fuel screw (turns out): 2 turns out
Needle Model/Clip position: JD Red #4
Grey Wire Mod (Y/N): Yes
TPS Connected (Y/N): Yes (not re-adjusted from factory)
Airbox Snorkel/Lid (on or off): Airbox lid off
AIS Removed (Y/N): NA
Airfilter Brand: Twin Air w/ No-Toil Oil

**Exhaust Brand: Stock, with GYT-R Insert**

Average Altitude: 700ft (Michigan)
Average Temperature: 70-90 F
Average Humidity: 70-90%
Degree of Satisfaction (0-10): 9 (we can always want more can't we?)
Additional Mods/Comments: Additional mods:
Light Blue Wire
O-Ring Mod
ACV disabled (which is why I have a 100 PAJ rather than a 75 stock)

I just picked up a FMF Q for my bike and wondering (if any) jetting changes I might need going from the stock pipe with GYT-R insert to the FMF. I haven't had the opportunity to ride it yet with the FMF to test, and won't be able to for several weeks. I'm actually quite bored at the moment, and not at home to play with the bike. Any suggestions would be appreciated. I'm just not sure how different the FMF is vs the Stock can with GYT-R.



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