Maintenance & Technical > KX250 / KX125

Main Bearing Repacement

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BDI:
this is my high tech case splitting tools. steering wheel pullers work just fine but you need to source up the correct bolts. On the pullers I have the slots had to be lengthened by 1/8" with a round file but thats no big deal. I like useing two pullers when ever possible, on yamaha 450 engines if you let the cases get out of parallel to each other just a little bit it will crack the case where the shift fork slides in. On any engine if you let the cases get out of parallel you run a chance of screwing something up.

bigbellybob:
nice when we going to split my cases?

mustangfury:
Cool, I have a steering wheel puller and i was wondering if it would work.  The only problem i have is i dont have bolts long enough.

I was looking over my parts and the piston has some wear patterns on it. I was wondering what they could be signs of.  This could be from the goofy mixture that was being run due to the leaking crank seal. I know the black crown is from all the crank oil getting in to the cylinder. I was just wondering about the marks on the skirt. Let me know what you guys think.  My camera takes good pictures up close. If you need a zoomed in shot click on the image.

I will post pictures of the inside parts once i split it.

Thanks.
Stang.

jonny500:
i would renew that piston. you need to have your bore measured too. i have not :| see marks like that on  a piston before.
take the ring off the piston and put it in the bore as if it was on the piston about 1/4 inch down the bore and post a pic

kaw rider:
check your piston clearance

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