Been lurking the forum over the last few weeks and it helped me a lot in deciding to get a WR250R for my first bike.
Long story short, I recently found an '08 model with only 2000kms on it. Very clean and barely ridden, with a Powerbomb and Lexx slip-on installed. Test ride went fine upon inspection, revs nicely, all sweet. Got it home and it wouldn't start (pump wasn't priming). Did some google searches and promptly ordered a new fuel pump. Installed the pump, starts fine, happy days. Little did I know I accidentally and unknowingly pinched/kinked the fuel line when putting it all back together and spent the last week wondering why it was so boggy and wouldn't hit the rev limiter in any gear, haha.
So now i'm off to order a new fuel hose (hopefully this was the only culprit) and I'll finally be able to experience the bike in all its glory, FINALLY.