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Discussion Starter #1
I recently bought a 99 cbr900rr for $2000 with 8,00 miles. The guy I bought it from said it has a spun bearing, if its the crank side can it be turned to fit a new bearing? or is the only option a new crank? what are some other possibilties?
 

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It depends how badly damaged it is. Can you hear it banging?
Usually it's rod bearings that spin. The shells bite the crankpin and get spun in the rod so you might have to replace a rod as well.
It should be possible to machine a journal under-size but you might struggle to find an over-size bearing to fit it.
You could also have the journal sprayed or welded up and then machined back to the correct size.
It might just be a whole lot easier and cheaper to find a good crank (or engine) and drop that in though.
Apparently, on the 900RR you can reach the bigends through the sump without removing the engine or splitting the cases so you can inspect the bearings first. If you're really lucky it's not too bad and you can just pop some new shells in.
 

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Falicon can repair the crank journal and resize your rod. They used to charge about 200 bucks for crank repair (per journal) but you might want to double check as it's been a while since I've had that done. Price for resizing the rod is around 50 bucks. Mic everything, you may have gotten lucky. I spun #3 twice. Got lucky first time, not so lucky second time. If you call Falicon, ask for Raoul, he will hook you up.
 

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Discussion Starter #4
ok my mechanic says the bearing is jacked, bent the rod, and scuffed the crank. The only place I can find to do it is the above falicon(at least 3 weeks) because they are in Florida and I'm in Michigan. I would rather find someone local to get it done, any idea where I can find the tolerance for the crank?
 

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Try ebay for a used one. I got one few months ago for 90 bucks. Do you mean the journal size? You'll have to check on the side of the crank for the code (marked in white) corresponding with that journal. They are broken down into size groups. Find the code and cross reference it with a manual to get an actual size or post here and I (or someone else) can get it for you. It will be the 4 digit code (the 5 digit is for mains). I can't remember off top of my head if it's a letter or number. The digits read left to right with the first one being for cylinder #1.
 

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ok my mechanic says the bearing is jacked, bent the rod, and scuffed the crank. The only place I can find to do it is the above falicon(at least 3 weeks) because they are in Florida and I'm in Michigan. I would rather find someone local to get it done, any idea where I can find the tolerance for the crank?
APE also do crank work APE
Any crankshaft shop can repair your crank if it's repairable.
If the rod is bent it's very likely you also have bent valves on that cylinder.
I don't know what you mean by "tolerance"?
I only have the '98 manual:
Runout is maximum 0.3mm (0.012").
Side clearance 0.05-0.20mm (0.002-0.008") maximum 0.3mm (0.012").
The journal should be 36.503-36.485 but use the colour code of the shell that came out and have the crank ground to suit that. The oil clearance you want is 0.017-0.035mm (0.0007-0.0014") with a maximum 0.04mm (0.002")
 
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