There are pins on the other 3, but not this one as far as I can see. When you say it like that, it totally makes sense that it wouldn't be absolutely critical, so long as its not allowing the crank to wobble or anything.Tim said:I'm no professional, but it seems to me the mating surface of the engine case for the outer race of the bearing shouldn't be super critical.
I expect there is a positioning pin of some sort to keep the race from rotating (I seem to recall this on the main bearings of the XS650 crank).
Perhaps the shavings you have are the pin, which I expect would have been in the holes shown in your photo. If the bearing locked up I guess the pin might shear, but I would have thought it would spin on the crank first (it's probably pressed onto the crank and then positioned with the pin in the case).
Yes they are fed by engine oil. The bearing surfaces are not really critical, though I would guess that the bearing pictured may have overheated at some point. I would replace it, its pretty straightforward with the correct puller. Heat the bearing and freeze the crank to put the new one on. I use PVC pipe that just fits over the crank as a drift to seat them.CALfeRacer said:There are pins on the other 3, but not this one as far as I can see. When you say it like that, it totally makes sense that it wouldn't be absolutely critical, so long as its not allowing the crank to wobble or anything.
Also, all 4 bearings do seem to spin fine, but definitely not great. I assume they're fed by engine oil and not packed with grease?
Well in that case I would just look for a complete engine, and use what you have as spares or sell to offset the cost. I've pieced together engines and its not a cost effective way to get yourself a good powerplant.CALfeRacer said:I'm concerned that the center bearings might be broke :-\
Cam and rockers are MIA, when I got the bike it was for free out of a dead guy's shed in Bakersfield, cam and rockers (along with most of the top end) were nowhere to be found. This is part of why I'm concerned moisture got in to the bottom end/center bearings. Maybe I just need to pump oil in and turn a bunch to see how they feel.
Also after some internet digging, Honda might have gotten rid of the pin on the 4th bearing during the production run??
That's the right attitude.CALfeRacer said:I gave the bearings/crank some love with brake cleaner and WD40, everything spins real nice now. Not too worried about the bearings anymore, worst case something seizes when it’s running and I have to get a new engine anyways
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