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Engine bearings XT600-2KF Engine bearings XT600-2KF
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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 15 Dec 2009
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Carl Henrik.

Thanks for this thread. Most interesting.

I read someplace that crankshaft bearings are “special” bearings that you should not buy from the local bearing house?? (This was not for an XT, but a 2-stroke MX bike, but I guess the same should apply) Have you heard this? Do you know if there is any difference in “genuine” bearings from the dealership and “ordinary” C3 bearings from the local bearing house?
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Old 15 Dec 2009
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Hi Carl Henrik,

Please excuse our British sense of humour.

Cheers.
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Old 16 Dec 2009
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Carl Henrik, I sent you a PM, please be kind enough to take a look.
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Old 16 Dec 2009
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Hmmm. I was not joking. I never have found out if “genuine” crankshaft bearings are indeed somehow different from “regular” bearings, or just three times more expensive.
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Old 16 Dec 2009
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Hello folks!

Straightening things out: The bearing-standard-number that is stamped on a genuine Yamaha bearings outer ring doesent always say if the bearing are having the C3 play or not. Mostly cases it dont say. You have to measure it up yourself.
But I suppose this could be different from Yamahappy to another brand, when the bearings are not japanese, FAG or SKF maybe.

I have been lucky to have been helped by the local Yamaha dealers own mechanics who have told me specially that a crankshaft bearing always needs to have C3 play, because the crankshaft is never doing high rpm:s being 100% straight. even if it is brand new. Too much weight and force going on in there. AND ofcourse the heat, that will take away the play and just precise give enough space for lubrication.

The conclusion would be: You should have C3 play on a 2-strokers crankshaft because the oil is only 2% mix with the gasoline, this makes the C3 play ( by the mechanics called "heatplay") even more necessary.

And yes, it should be enough with a "standard" bearing from the local bearing store.

Someone who know something I don´t??

Regards Carl Henrik
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Old 16 Dec 2009
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In my opinion Standard bearings from a local bearing store could be made of even better material than japanese ones mounted as "Yamaha Original".
You know the japs arent leading that development anymore.

Depending on what bearing-brand you choose, you should look up the specific facts about the brand your local bearing-store sells, for example 6306 that are often used as crankshaft bearings, in this case you could check for the C value, Dynamic bearing capacity, and compare it to the same 6306 in the other original mounted brands list. If there is a difference, there you have it.

I have learned in my former studies at The Royal Technical University in Stockholm how to test the hardness in a piece of metal, but in this case I leave that assignment to someone else, when I dont have access to the right equipment anymore... But I know Swedish bearings are good

I hope this sounds what you asked for?!! Or even better I hope!

Come on now, give me some info I dont allready know!!

/ Carl Henrik
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Old 16 Dec 2009
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When I used to buy things like swing arm bearings for Jap Motorcross bikes they tended to be a funny Japanese size and you couldn't get them from a normal bearing supplier.

Yeah I was only joking Carl Henrik
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