grey wire on the wr 450,08 reg alloy frame
Posted August 12, 2010 - 09:37 AM
Posted August 16, 2010 - 11:09 AM
Yeah that's the one.
I believe its an earth wire and disconnection causes minor changes in the ignition advance curve.
There was an image of a (2009 WR450F from memory) before/after dyno run somewhere here in Thumpertalk a while back. The disconnection does make a difference to the power delivery, but its minor.
Apart from that, engine-wise, replace the pea-shooter in the end of the muffler with a better breathing one and re-jet if necessary.
I've also fitted a YZF header to my '08 and opened the stock muffler up. You can often find YZF exhausts real cheap on eBay.
http://www.thumperta... saves big $$$$
The suspension is pretty average. The compression damping on the front end especially. Set you race-sag at both ends and look at re-valving as soon as you can.
Posted December 06, 2010 - 03:07 PM
Posted December 06, 2010 - 03:21 PM
Posted December 07, 2010 - 01:28 AM
Posted December 13, 2010 - 09:21 PM
I've done the same mod to my 08 450 and I reckon the difference was only very minor for me, certainly not as much as on the 426. Might be showing my lack of feel for the motor here
As WR450FGREG said, suspension is a must-do, especially if it's got a few miles on it and never been done, as the forks apparently get worse very quickly after a while from new - start blowing through their stroke even more quickly than when brand new.
I'm only going on what I've read here, as I sent mine off pretty much as soon as the bike was run-in.
Posted December 13, 2010 - 09:29 PM
the forks apparently get worse very quickly after a while from new - start blowing through their stroke even more quickly than when brand new.
Apparently the main issue with the stock Yamaha setup is that silly little spring in the valving that controls the compression damping. It "softens" with use and susequently the forks slowly lose compression damping effect.
I may well be shot down by the "experts" here, but that's what I've been told (and read) is the main problem with the forks' valving.