2002 WR426 - Cam timing ,Grey wire, Exhaust
Posted March 17, 2002 - 02:54 AM
My question is there a after market exhaust that has the same or better performance that is not so loud.
The YZ cam timing I,m going try it after I,m used to the bike. I have heard differance storys on what it will do to performance. I like to hear from someone who try it both ways.
One last thing any one run in East coost - CT area . Any jetting suggestion. Right now it seem to run great stock. No problems
Thanks in advance
Posted March 17, 2002 - 05:01 AM
Posted March 17, 2002 - 04:40 PM
Posted March 18, 2002 - 09:28 AM
Posted March 20, 2002 - 02:26 PM
Posted March 20, 2002 - 02:44 PM
The light blue wire apparently connects to the neutral detection circuit. Apparently that changes both the ignition timing in neutral and engages a more restrictive rev limiter. Local hop shop owner swears WR250F has a 7.5K rev limiter because he tested it. What he doesn't know is if the bike were in gear, it would have rev'ed to 13.5K.
I've read (on this forum) three possible explanations for why the hell Yamaha would have this here (1) noise measurements in neutral, (2) protection from reving on stand, and (3) protection from missing a gear, hitting neutral and overreving. I think all of these are weak. Could be overheating protection while on stand (retarded spark, less heat while no air through radiator).
If you pull the light blue wire, you don't lose the normal rev limiter, you lose the more restrictive rev limiter (and timing change) that only occur in neutral.
Does this change tuning on brake dyno, since that testing is all in neutral?
Posted March 21, 2002 - 07:56 AM