I just picked up an 03' WR450, pretty much stock from what I can tell and doesn't seem to have a lot of hours on it judging by the condition. It has good power and does start right up. However it backfires (more like a popping, not a full blown backfire) on deceleration and has a pretty rough idle, not back enough that it will stall but not as smooth as it should be. Also, the first 2-3 inches of the exhaust are red hot after warming it up and revving it a few times on the stand.
So, is this an obvious problem, like a carb adjustment? Just from doing some quick searched it seems like it may be lean... I can make and fix just about anything, but when it comes to carbs I usually stay away... I'll probably end up taking it to the shop, but if it may be something simple I can give it a try first. I know it'll be worth getting this bike running good. I used to have a WR400 and it was my favorite bike I've ever owned. Last summer I got back into riding and got a 2013 WR250R, it's a great bike after doing some mods, but I missed the power...
Edited by acarter92, February 05, 2015 - 01:12 PM.