KX 80 crank

[YZ 125]

Hi, I bought a 1993 kx 80 about 1 year ago and I have gone through 3 cranks. The first and second ones was I was being stupid because clutch was grabbing it would over rev and seize, they had about 30 minutes on each one so I replaced the clutch after I realized it was grabbing. The third one has about 15 hours on it and now it connecting moves up and down. How long should a crank last? Is it just because I have a older bike and every thing is old. I s it normal for crank to only last 15 hours.

 

[minutz]

I would say at least a year, you have other issues, it is suckin dirt or your premix is messed up.
Check the pipe o ring it will suck dirt there if it leaks bad enough.