2002 wr426f question
Posted May 10, 2009 - 10:53 AM
Posted May 10, 2009 - 12:54 PM
Posted May 11, 2009 - 02:39 PM
Model (400 - 426 - 450): Yamaha WR 426
Cam Timing (WR/YZ): WR timed
Main jet: 168
Pilot Jet: 45 (or 48, I don't actually remember)
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: FMF Q
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
ACV disabled (which is why I have a 100 PAJ rather than a 75 stock)
YZ throttle stop
This is the list of my bike settings/mods. I had the same settings using the stock exhaust can with they GYT-R tip. The combination of a new exhaust and O-ring mod were the 2 most dramatic thing done. It cleaned up the low end bog, and unleashed a lot of extra power, especially down low. I did the BK mod to the carb and personally found that the O-ring mod was far superior, so I no longer have the BK. The carb should still be tuned such that the spray of gas just misses the slide. I MAY have gone from a 45 to a 48 pilot when I went from the GYT-R tip to the FMF Q pipe.
I used to have the dreaded bog down low, but properly jetted you can basically tune it away.
Posted May 20, 2009 - 09:07 AM
The O-ring mod rocks. I had noticed my AP was working poorly and was wondering how to fix it. This mod is exactly what I needed. Bog is now gone. I owe you a beer.
Good to hear:thumbsup: That mod was far and away the best I had ever done for performance.