Maintenance & Technical > KX500 Original

she wont rev out...

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Grunty-Motor:
i am trying desperatly not to have another motor in bits (until the middle of winter at the least...) but if i do, i'll check the KIPS properly - cheers.

put the old coil back in and drained 1/2 the gearbox oil out. new HT lead, plug and plug cap. its missfiring worse. so, maybe the coil aint that good (meets the specs of the manual though).

did a compression test - 140psi (bearing in mind it has bouble base gasket fitted). so that would seem to be ok.

next chance is to fit a new coil and heavier (mineral) oil rather than the semi thats in it now.



any thoughts on why it might surge on the over run?

Hillclimb#42:
My 500 quit surging when I got the idle screw backed out to a useable position. When I bought the bike it was worn-out and the throttle cable was tightened in the adjusters to get it to idle. I didn't know that right away, but I did notice that the idle adjustment did nothing. That was because the seals were worn and so was the cylinder. The slide slamming closed completely is what you want for less surging. Jetting can get you to idle as long as the seals are tight.
  Also, the surging will only get you into trouble, if you forget to grab the clutch.
  On another note, I recently discovered that floats set too high(to shut-off the gas later) robs lots of power and causes a rich condition that is impossible to jet- out completely. Getting the floats set perfect, and being absolutely positive the reeds are sealed ( resisiting raw fuel) makes it rev hard. A few times we have tinkered on the jetting or float level and actually somehow caused the floats to stick or not get it back right. Keep an eye on overflows when having these issues. Fuel pouring out is a stuck float which is easily fixed. Make sure the flow of air is as free as possible, i.e clean filter, clean functioning powervalves, clear silencer.

serafin:
To me it sounds like your problem may be an electrical issue.  Not really knowing the history of the bike (how many owners/rebuilds ect..) and it being a 20 year old bike.  The electrical components have probably broke down.  The coils may test ok but may actually be bad.  I would consider replacing the stator coil.

Serafin

Grunty-Motor:
a little update - havent had much time of late...

bought a new coil - it now revs out, but no power.

put 20-50oil and only half filled it - made no difference [that was to see if it was drawingoil through the crank seals]

pic of the plug attached - brand new, done about 10miles. running a pre-mix of 45:1.

does it look like its drawing tranny oil?


next step is to get a flywheel puller and check the stator.

kaw rider:
get a new spark plug and set the gap at .250" & .375" and see if it jumps the big gap.

Sounds like maybe a carb issue.

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