WR400 hard starting
Posted December 20, 2007 - 09:16 PM
Posted March 12, 2009 - 09:32 PM
Posted March 13, 2009 - 05:45 AM
o.k. fellas, 99wr400 starts great (or did). tonight it seemed stuck open, no throttle on and the rpm's went to the moon. Pulled over, got it to restart after a long while-shot to the moon again on rpm's w/ no throttle on. This behavior would make me think one of the throttle cables broke. Visual inspection (in the dark) seems cables ok - Is this a stuck slide? or? Comp release handle was squirrley (Hot?) for awhile then compression returned, but would not start. Apologize in advance if this issue has been addressed, search wr400 put me here
Definitely a broken throttle plate. When a big chunk comes off it's like holding the throttle open. Mine broke out on a trail and I had to ride home controlling my speed in really tight spots with the kill switch.
Posted March 13, 2009 - 07:23 AM
Posted March 13, 2009 - 08:17 AM
Found the part#s from another thread, looked at Ronayers.com and the price of the slide has jumped from 74$ to 128$. Are there other options, or should I just put an Edelbrock on; Seems goofy putting a 400$ carb on a 1500$ bike, however 128$ for a slide that may break again is goofy too. Thanks again for your excellent advice. If a chunk of the slide has been sucked into the motor is there anything I can do at this point?
The chunk would pass through the combustion chamber only, so there shouldn't be any worry about pieces in the bottom end, unless a chunk did some damage to your piston and/or cylinder wall. There could be some damage to a valve or seat, but since your bike is still running you must have compression. A fairly big chunk broke off of mine and appears to have blown right out the exhaust with no obvious damage to the engine. I rode it for years after that with no related problems.
Posted March 13, 2009 - 10:27 AM
Posted March 24, 2009 - 08:36 PM