'03 WR450F. Low voltage to TPS. CDI?
Posted September 17, 2010 - 08:48 AM
Posted September 29, 2010 - 11:12 AM
I still haven't managed to get this bike running right.
Check the cam timing, confirm both the marks line up and the lobes look right (cams have been known to move in the sprockets unless welded).
Today I checked the cam timing as William suggested, it was fine. I also took the opportunity to check the valve clearances while I had the head cover off. They were all spot on, at the the tight end of range.
Also I've taken every electrical connector apart and cleaned it up with a small dental brush and WD40.
Any other ideas what to do next?
Posted September 29, 2010 - 11:39 AM
Posted October 08, 2010 - 01:19 AM
I think I'll go for a upgraded stator/DC conversion kit first (£133 or $210 - ouch) first
and if that doesn't fix it I'll take the head off and check out the valves, piston etc.
Just a thought, does the auto-decompressor ever cause problems on the WR450?
When the engine is struggling to rev it maybe sounds like it could be a valve not closing properly.
Posted October 14, 2010 - 06:05 AM
It's still not running right and won't rev past 5000rpm.
So I'm going to take William's advice and change the stator and crank position sensor next. The Trail Tech one, this one, is a similar price to the OE Yamaha item and is apparently higher output and a DC conversion.
Anyone think the TrailTech one would be bad choice for any reason?
Posted October 14, 2010 - 08:53 AM
Posted October 18, 2010 - 01:03 PM
This getting me down now.
Posted October 20, 2014 - 12:35 AM
I seem to have a same kind of problem (at 6000 rpm) - see http://www.thumperta...e-and-high-rpm/
- Engine was running bad at low rpm
- Noticed wrong valve cam timing setting - I noticed this when I was checking valve play (minimal adjustment was needed)
- Changed cams timing to spec + replaced ignition coil + replaced oil filter
- Engine running now fine at low rpm, but not at high rpm ---
- delayed the outlet cam - 1 teeth- to get better cleaning of the exhaust gas (valve opening overlap inlet - outlet), did not work...put cam outlet back to normal...
- Tried with and without DB killer (exhaust opening - restriction more / less) - No effect
- Now I suspect the ignition coil + oil filter
- Gonne run without oil filter today and check resistance levels ign coil vs spec.
PS did you solve the problem finally? Or sold bike
Edited by Arjan van Druten, October 20, 2014 - 12:38 AM.
Posted October 20, 2014 - 08:05 AM
I would remove the carburetor and clean it inside out. It probably takes you one evening to do so and then you know its clean and isnt causing you this problem.