10 450f Only three gears after a case swap

5 replies to this topic
  • oldtymehockey

Posted December 22, 2014 - 06:49 PM


Hi all. New guy here. Some of you may know me from other forums. I did my diligence and searchEd for my problem. Either I stink at searching or I have a new issue to ask on.

I got a 10 450f which the chain had broke and damaged the clutch push lever shaft part of the left case. I have spent the past month swapping the crank case and waiting for Yamaha to send parts.

I finally finished assembly of the engine today. There is no gear down from neutral. The shift lever goes down but there is nothing there. I have only three gears up. I am hoping it is something with the segment and I don't have to split the cases again.

Has anyone had this happen to them?


  • Krannie McKranface

Posted December 22, 2014 - 07:14 PM


Yes, you will have to split the cases again.

Closely inspect the exloded diagram of parts to see what is missing.

  • oldtymehockey

Posted December 22, 2014 - 07:18 PM


Ouch. Thanks. I feared it was those dreaded shift forks. The diagram in the service manual is upside down and reversed. Very hard to follow.

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  • oldtymehockey

Posted December 22, 2014 - 07:23 PM


Sorry for posting in the incorrect model specific forum.

  • bikedude987

Posted December 23, 2014 - 06:50 AM


you should be able (with everything in one case half, usually the right) to shift through all the gears to ensure you don't have any more nasty surprises...

  • oldtymehockey

Posted December 23, 2014 - 07:29 AM


I have been advised to use the right side when assembling as well. That matches up better with the visual in the manual. I was understanding things only went together one way. I guess that isn't necessarily the case. Pun not intended. I didn't force anything. Things just slid together.


As for the right side, I do find it challenging because the crank needs to be pulled through the left side. This causes me concern on joining the case halves when reassembling. If I drop the crank in the right side, assemble the tranny in the right side, set the left on top and pull it through with the puller, I fear if something isn't lined up just right it will bend under for force of the puller. I like the feeling of things sliding together and fitting into place. 


What I did when I assembled this the first time is set the transmission in the right side without the crank installed. I then brought the case halves together to move the assembled transmission to the left side. Then while making sure the transmission didn't move I pulled the crank through. Then I Yamabonded the now empty right side and slid it into place. That way I could make sure everything fit smoothly and noting bent. 


I guess I'll be real good at splitting cases by the time I'm done. Should make replacing shift forks on the SV racebike much easier. 


Thanks all!


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