wr 400 carb problems
Posted August 26, 2001 - 01:10 AM
Posted August 26, 2001 - 01:36 AM
Originally posted by NH Kevin:
Yes, at least two guys.
Posted August 26, 2001 - 09:37 PM
Originally posted by Damian:
Yes. I've had the same problem. I now check the slide every 1000km max. Have had to replace 4 of them. Running standard pipe and jetting. Yamaha dealers have been of no help (Melbourne, Australia) Any one got any ideas?.
Posted August 28, 2001 - 09:10 PM
Not hard to replace. Follow the manual if you have one. Otherwise, take the carb out, take the cover off the top and remove the slide. might be a couple of screws to remove also. Note how the slide fits so you can fit the new one the right way around. Not also it has a circular, lipped rubber seal on it. Note also how this fits ie which way the lip goes. The seal is bloddy expensive if you break it ($30 I think) and the plate is also a ridiculous $130. Clean the fuel pump/squirter diaphram wilst you have the carb off...it will be filthy.
I think the back firing might be the cause of the problem. Mine did the same. If this happens on a trailing throttle such as when going down hill, try adjusting the mixture screw on the bottom of the carb. Screw out to richen. Will need a short screwdriver bit or a something like a welding rod flattened on one end and bent to fit the screw.
Posted August 29, 2001 - 12:11 AM
Check it regularly. Or keep the throttle open.
'99 WR400 F, YZ exhaust, throttle stop trimmed, WR timing, airbox cover removed