Hello again folks!

I have been checking out the XT600E service manual(that can be found in another posted thread in here ) a few times and it tells me about the same facts that I allready have discovered before...

On the older XT600-2KF the specification of the bearing on the left side of the crankshaft is unknown.. But the eyes can tell atleast its a 6306. But the right side seems to have the same specification as the E models both bearings on the crankshaft: Bearing 6307SH2-C4. In my research I have discovered that this bearing 6307(and others) C2-C3-C4 tolerance depends on the manufacturer who made the bearing, its not always C4 !! Or C3 or C2. The same letters doesnt need to be the same tolerance play under measure! (I hope my point got through before in this thread.) Another thing I have discovered before: C3-coldplay is made to disappear when the bearing operates at high temperature, while the C4 play maybe never disappears totally. Thats why the C3 mostly goes by the name "heatplay" and the C4... I dont know. Yamahas mechanics only told me it was "special".. This could be a reason(one of them) of the shorter length of life when we use bearings with ordinary heatplay instead of C4... as in the manual... Maybe I have to do some more research about C4...

Ofcourse, I agree, mostly the Yamaha Genuine Parts as gaskets, valves, springs, pistons, clutch-parts, steel-wires and more is the best for the bike. Also little more expensive. And maybe not as exciting to use either
Have to say that I always have used genuine parts, no matter what the bike or manufacturer, but sometimes EXEPT for the bearings!
This kind of experiments is only recomended when you use the bike inside your own country, wouldnt recommend to do it longer round trips abroad.

The quest for the exact bearing-specifications continues. Only maybe a little bit slower than before...

/ Carl Henrik