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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 2 Sep 2008
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Join Date: Nov 2002
Location: Hofstade Belgium
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Advice on crankshaft bearing

During dismantling of my 2KF motor I found out that the left crankshaft roller bearing (alternator side) could be very easily moved on the axis. After removing the bearing the axis clearly showed a very shiny surface. The diameter of the axis is about 1-2/100 mm smaller than the nominal inner diameter of the bearing.
Is it possible to repair this by mounting a new bearing with locktight or should I take more drastic measures and what are the possibilities?
The motor clearly had a knock and more than normal vibrations before dismantling.

Any advice is welcome

Guy
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Old 4 Sep 2008
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Drastic

This is the bearing behind the gearwheel for the camchain, just to make sure ...

It should be press-fitted, so if it has movement, there is a problem. Installation with Locktite not recommended, this will not handle the forces on the bearing.
Three options:
- Yamaha sells this part of the CS complete with bearing and gear - probably very expensive
- A second hand CS, and overhaul it (bearing, big end (conrod)) - the gearwheel CAN be removed and re-installed
- Weld-on the missing metal and get it grinded to the correct dimensions - I think this might be the cheapest / easiest way to go, although picking up a second hand crankshaft cannot be that difficult either, they almost never break ...
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Old 5 Sep 2008
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I came across a guy selling some stuff on ebay based in canterbury who had a bunch of stuff, I managed to relieve him of a couple of crankcases.

But I know he is on the XRV forum as well, with a 750 super tenere he is building up. worth asking there, great guy
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