Maintenance & Technical > KX100 / KX85 / KX80 / KX65 / KX60

big end bearing replace

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KXcam22:
Daggits,
  As a suggestion check what 2-stroke oil your friend is using.  I had an expereince with a friend who blew up their KX60 a number of times, lower end rod bearing each time from overreving.  They were using the "dealer" recommended oil which was a low grade injector oil that was not really meant as mixing oil.  I got them to switch to a more expensive high grade synthetic 2-stroke oil and their problems went away.  They then figured out that the "expensive" oil was actually the cheaper one to run. A $3000 lesson.  Cam.

ps I witnessed the dealer recomend this oil to a number of KX owners.  Must increase his business.

hughes:
To replace the big end bearing you would need to press the big end pin out of the crank shaft halves, and you'll need a special devise for tune / balance the crank once new rod and bearing was replaced. You made a good choice to buy a complete crank kit since they are priced about right. Might be a good time to replace crank main bearings and complete top end while your there.

lumpy790:
I do not know if they are making kits for 80's yet but I just picked up a Wiseco Bottom end kit for my YZ250 that included a complete crank, main bearings, piston bearing, seals and gaskets......and retails for only $216

Mind you that I could have pressed & trued the crank my self....but bought it all ready to install.

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