Jetting prob due to TPS setting
Posted April 12, 2001 - 03:47 AM
(main 175, pilot 45, clip #3)
The problem is that the bike rides great but is fouling plug after plug (plug is soot-black after riding).
Does somebody has any experience with this ?
'99 WR400 F, YZ exhaust, throttle stop trimmed, WR timing, airbox cover removed
Posted April 12, 2001 - 04:24 AM
change the needle to a dvp PT# 5be-14916-dp
clip#3 ,and change the main to a 180.pilot 45
Thats what I did and my bike runs like a bat out of hell.
98wr400f stock exhaust,throttle stop trimmed yz timing, airbox cover removed,fmf hi flow head pipe,
also do a search on this issue and you will get a ton of info.
Posted April 12, 2001 - 07:10 AM
What is your pilot screw setting at? Have you tried turning it in? This is most likely the problem.
The DVP bill suggested is a bigger diameter and is a sensible choice. It's not even close to how lean the newer '00 & '01 WR's diameters are (DRS and DRR).
Last letter sequence rich to lean is- M,N,P,Q,R,S
DVP#4 is a good starting point for a D-- needle regardless of cam timing.