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2 Oct 2010
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Registered Users
HUBB regular
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Join Date: Sep 2010
Location: Central Illinois
Posts: 23
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Any bearing experts? Replacement engine/transmission bearings
I plan on replacing all the bearings internal to my '92 XT600 motor (they need it, trust me). Crank, transmission, etc.
The actual Yamaha parts average about $30 per bearing and I know that Yamaha is usually pretty pricey on their parts. Most of the bearings are a standard size so I imagine that I can get high-quality (non-Chinese) bearings from a bearing supplier for cheaper.
I know that even within a given standard size, bearings have different internal clearances for different operating temperatures (Normal, C2, C3, etc.). What size is optimal for the high temperatures a unit-construction motorcycle engine operates in? I have an old Classic Motorcycle Mechanics magazine that states that they should be the C3 design, but I'd like to get some other opinions.
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5 Oct 2010
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Registered Users
New on the HUBB
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Join Date: Dec 2002
Location: sydney, australia
Posts: 16
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bearings
Hi Radbaron,
I went through all this c1, c2, c3 bearing business when I rebuilt my motor. In the end I used genuine Yamaha bearings, just to be on the safe side. Also, a while ago there was a long and detailed thread (On Horizons Unlimited.) on the same subject and from memory it came to the same conclusion. I.E. Use genuine bearings.
Hope this is of some help Paul.
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5 Oct 2010
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Contributing Member
Veteran HUBBer
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Join Date: Jun 2005
Location: cardigan,wales
Posts: 249
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__________________
Just going for a short ride on my bike....
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6 Oct 2010
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Registered Users
Veteran HUBBer
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Join Date: Mar 2008
Location: Back in Melb
Posts: 287
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Research and more research
I had a similar dilemma and I did two main things.
Get the manufacturer number info off the bearing you are replacing like "KOYO BHKM1730JU" it should be stamped on the bearing. If you can't get the bearing info from the bearing you can try measuring the bearing, internal, external diameter, width and do a google search. It is rare for a bike manufacturer to use a non off the shelf bearing, that is not made by about three different bearing manufactures
Do trawl of the internet for motorbike bearing suppliers. Quite a lot have bearings and models matched up.
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