Maintenance & Technical > KX500 Original

Flywheel nut thread

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tschisi:
Hi!

I can?t attach my new flywheel nut to the crankshaft.
It goes 1 or 2 turns and that?s it.
It seems that the threads don?t fit and the crank would cut a new one into the nut.
I know that my frame is from March 1990 (my nut is also for a 1990), but maybe my engine isn?t?!
Engine number is KX500BE011113.
I measured the crank thread as something like 12x1,22mm.
Do you know if there were changes in the crankshafts?

thx

jonny500:
it sounds like you are trying to put a 12mm course thread on. the nut should be 12mm x 1.25mm where as a course thread is 12mm x 1.75mm. i would get a new nut from kawasaki to be sure. as damage to the crank thread will be expensive. i see you are in austria. if you cannot get one let me know and i will give you some contacts from the uk or send you one i have here for nothing
best regards
john

tschisi:
I got mine from kawasaki.
 :?

jonny500:
if that is new nut then the thread on the shaft must be damaged or stretched. you need to get a 12mm x 1.25mm die and try and revive the thread but be carfull as i said before if the thread on the crank shaft is damaged it is expensive. if the thread is damaged beyond repair you could cut it off and drill and tap a female thread in to the center of the crank and use use a bolt. i am not recomending this as it is a bit drastic but could be an option as a last resort.
regards
john

cbxracer30:
You may want to try a thread file , they are a great too; to have . You can usually fix up anything threaded with one of these. And test fit the nut on another bolt the same size and thread just to make sure it is not the nut that is screwed up , We have all got brand new parts that were wrong or screwed up from the factory- so much for quality checked. CBX

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