replace cam bearings on 99 yz400f??

10 replies to this topic
  • RocketRoss57

Posted October 24, 2011 - 06:24 AM


can you press them off to get some freshies?

  • grayracer513

Posted October 24, 2011 - 08:46 AM


You could, but the cam sprockets are press fit without keyways, so if they are removed, they have to be re-indexed manually in order to get the cam timing right. Neither Yamaha nor the aftermarket sell the bearings separately for that reason, although you can probably cross reference them.

  • intensem1rider

Posted October 24, 2011 - 09:22 AM


Any motor builder in the country can do it for you for pretty cheap. It's not something you can do at home without the proper knowledge or tools.

  • RocketRoss57

Posted October 24, 2011 - 05:21 PM


thanks fellas. was just thinking about it. i like fresh bearings.:thumbsup:

  • Sebastian Pavich

Posted October 26, 2011 - 11:07 AM


would it really be worth doing that? why cant u just buy hot cams or is it cheaper to get new bearings?

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  • RocketRoss57

Posted October 26, 2011 - 06:13 PM


bearings are cheap. cams are not

  • Sebastian Pavich

Posted November 01, 2011 - 06:30 AM


how much are just bearings? i never really heard of cam bearings going out.

  • grayracer513

Posted November 01, 2011 - 06:53 AM


i never really heard of cam bearings going out.

Ordinarily, they don't. The bearings will outlast the cams by 50% at minimum.

The cost of the bearings will be minor compared to the expense of having them properly installed.

  • Sebastian Pavich

Posted November 02, 2011 - 06:26 AM


the tools to do a job like that will be expensive too, right?

  • grayracer513

Posted November 02, 2011 - 06:51 AM


the tools to do a job like that will be expensive too, right?

You need a press, and some means of correctly re-indexing the cam sprockets within a degree of where they belong. Furthermore, the sprockets should not be removed and reinstalled without tack welding them to the camshaft for security, as the press fit will be weakened slightly by the operation.

  • Sebastian Pavich

Posted November 04, 2011 - 06:50 AM


ya that is some thin i would not want happenin to me, dont have the tools or time :busted:

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