Maintenance & Technical > KX500 Original
KX500 Wont Start!!!!
cass:
hi guys got new plugs spark today!. spark is still prety s**t! if i earth plug to the pipe, coil and plug spark and it jumps to pipe ok . but if you try and use one of the head bolts the spark is s**t! it still wont start! just took clutch case off. power valve was not engaging into mech so would that stop it from starting? ie; valve ports not moving . im due to torch this f**ker because it should be running ! ive had this baby from 1991/ it`s a 89 uk model so me and this bike has a lot of history . ive just restored it back to new and its doing this to me! should have left it the way it was an old dog that still went! i will post pictures of before and after only when its running the way it used to !
cbxracer30:
cass,
when you say you just restored your bike , did you paint the frame ? If you did , you may not have a good ground at the coil. If you did paint it ,the best thing to do is grind the paint off the frame where the coil mounts for a good ground. Also are you sure you have good compression and motor also spin freely with the plug out ? A bad crank bearing will seem like compression. Just some thoughts hope you get it figured out RonM.
cass:
cheers for the advice, have already buffed paint of at coil , also every bearing and seal changed on engine! now fuel is leaking from crank into mag ?. does this mean seal is f**ked because it wont spark right. Ie flooding it self > what causes crank seals to fail when there brand new?
Hillclimb#42:
A little weeping is no big deal. Also, the spark doesn't look bright like a car or truch, IMO. I had a hard time seeing mine also, until I checked in the dark. More often then not, it has spark or no spark. Its not too often that its a weak spark, unless its a deal like that on a loose or bad ground. I'd say you are chasing a cylinder issue or carb problem. If the crank seal was bad, it would still run. I know this is basic, but does fuel poor freely from petcock? How bout when tipped over, does it come out of overflows? Exhaust is definately clear? U tried different throttle positions? Hows the kicker working? I have to get it just right on the sweet spot on top, so I get 2 cycles or it won't start. Especially right after the rings set-in and compression was the highest.
Air leaks or blown gaskets, will usually make it rev high.
Jopiz:
Offtopic:
What does a good spark look like? Is blue and fat good and white is bad?
-J
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