I have a 99 wr400 that I bought from a buddy. Besides being a bitch and half to start, the bike will stall everytime I try to push in the choke. I have cleaned the carburetor, replaced the spark plug, adjusted the pilot screw, and messed with the idle screw to no avail. I've also replaced the fuel. I don't think the oil is too bad, but I stripped the f-ing drain bolt and I can't get that off now for the life of me. If I can manage to give it throttle the whole time, the bike will run fine. But if I lay off the throttle the bike will stall. Any suggestions?
99 WR400 won't idle without the choke pulled
Posted April 02, 2014 - 06:34 PM
Sounds like a typical clogged pilot jet. Pull it out and clean it and run a strand of copper wire through it. Make sure you can see light through it. For the pilot screw, or fuel screw as it's usually called, 2 turns out is a good place to start. It should have an O ring, a washer and a spring on it, make sure those are all there. I've found a broken bit of an old O ring up in the hole where the fuel screw needle goes. Also, make sure the hot start isn't stuck open.