Yz426 splitting case?

4 replies to this topic
  • Clutchup

Posted April 29, 2015 - 04:07 PM


Hey whats up guys im gona be rebuilding my sm yz426. Got new piston and timming chain also will adjust valves while there. Now i found a good deAl on wr426 trans gears, the whole gear box. How hard is it to get to the trans gears? I can do rebuilds and all that but not to sure on the trans i know it will be stator side. Is it as easy as pulling motor, jug and stator side and getting to the trans gears and swaping for wr gears? Also i have all other gaskets but when splitting the case do u need the crank case gasket? Is it a sealant or paper gasket? I also bought a flywheel puller. Thanks for any help guys.

  • grayracer513

Posted April 29, 2015 - 07:16 PM


The trans can be left in either side, or loaded in either side, for that matter.  I'm not sure there's an advantage to doing it either way, but I always load it in the left with the crank so they're both on the same side. 


There is no center case gasket.  Use either Yamabond (best) or a top tier automotive RTV sealer like Permatex's "Right Stuff".  Loc-Tite makes several product for sealing aluminum metal-to-metal joints that work well, too.  Just don't use the typical low-cost "silicone sealers" from the auto parts store

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  • Clutchup

Posted April 30, 2015 - 06:18 AM


Ok will get yamabond herd good stuff about it. Now for splitting the case what has to be removed to get the trans gears out to swap? Would i have to pull the clutch basket? Thinking it might be bolted to the side of one of the sets of trans gears. Just looking for a heads up. Thanks alot for the tips and help.

  • grayracer513

Posted April 30, 2015 - 06:21 AM


Yes, the clutch has to come off since it's mounted on the main shaft.


Need a service manual?





  • Clutchup

Posted April 30, 2015 - 12:24 PM


Ok thanks grayracer513

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