yz450f crank question

5 replies to this topic
  • rbm33

Posted December 19, 2004 - 04:50 PM


does anyone have a picture of the timing chain gear on the end of a 450 crank??

im doing a rebuild and it looks like the gear is worn, kinda looks like an old sprocket and there isnt alot of material on the peak of the gears. i just broke a valve and bent 3 other valves and im not sure if it jumped time because of the gear or if i just broke a valve and damaged the others.

any help would be appreciated.

  • jimmyg

Posted December 19, 2004 - 05:00 PM


i just replaced mine when i took it apart the teeth were severely worn the timing chain in these things chew them up i wish they would put a replaceable gear on these things it would be a lot easier & cheaper to fix that way.

  • rbm33

Posted December 19, 2004 - 07:59 PM


did you replace the entire crank or just the half with the gear on it?

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  • jimmyg

Posted December 20, 2004 - 05:43 PM


i replaced the whole thing although you could get away with half im not sure if it would cause a balance problem or not never tried it.

  • rbm33

Posted December 22, 2004 - 06:39 PM


a few pics

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  • jimmyg

Posted December 23, 2004 - 06:01 PM


:cry: :cry: :cry:

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