RSTChris said:checked valve clearences, all exhaust were fine but the inlets all were 7thou when they should be 4 to 6thou, would this make thta big a difference?
That was my thought as well. What you describe sounds like a lean condition. Did you use the hot-start to start the bike and then forget to close it? My buddy use to do it all the time on his YZ400F, we would get a great laugh at him in the pits about his "shotgun" bike whenever he did it...Ol'89r said:Check the hot start button and make sure it is closing all the way. Also check the rubber end of the hot start valve to see if it is sealing correctly and is not damaged.
RSTChris said:Theres alittle play in the hot start valve, i took it out and it seampt quite "wobbly", is this normal? also on the that goes into the carb, should there be rubber on it? mine was just brass....
QUOTE]
Chris.
That sounds like your problem. There should be a rubber pad on the end of the brass valve. The rubber pad should be in good condition with a round indention in it from where it sits against the orifice. If the rubber is damaged or missing or any of the parts that hold the valve against the orifice are missing, the bike will miss as you have described. The valve should not wobble and should snap shut when you close it.
Go online or to your dealer and check the parts scan to make sure you have all of the necessary parts in there and replace the hot start valve. If the rubber on your hot start valve has deteriorated, you will have to clean the little pieces of rubber out of the hot start orifice in the carb.
If your bike still misses, check your main jet circuit and make sure your slide needle is not bent.
I again point you to the Dirt Rider mag step-by-step tech article on this complex carburetor.RSTChris said:Well the new valve hasnt made ANY difference, although the valve they supplied is black and im pretty sure it the choke knob, had anyone got a pic of both valves for comparison?
Now the bike starts up after alot more kicks and at any revs missing but full throttle its spitting flames with a little black smoke
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