left hand crankshaft bearing failure!
Posted: Thu May 20, 2004 3:38 pm
Hi all, new to this list but not to motorcycling. Been riding since 1965. I love em all, even if I don't understand the Harley Davidson mindset. I have crotch rockets, sport tourers, motocrossers, dual sports and vintage.
I finally figured out why my `96 KLR sounded like the bottom end was coming apart. That's because the bottom end WAS coming apart! The left hand roller bearing was failing. It was finally revealed to me when I grabbed the magneto/flywheel and moved it up & down over an 1/8th of an inch. It's all apart now and the damage is obvious.
It's a damn shame, as the bike was running great and it only has 13K miles on it. I've been using Mobil 1 and the oil consumption had been negligible. My machinist friend suggests that that bearing has an unusually heavy load to bear because of all the balance weights that its driving.
I want to share this experience with others to see if there's any collective wisdom available. I'm also seeking parts advice as I'm now debating replacing the whole crankshaft, just the left half or merely fitting a new bearing. Plus a 1/2mm overbore and a valve job just to finish it all off properly. With me doing the labor the parts alone may add up to over 1K. All this for a bike that's only worth a couple thou?
Help!
Jerry,
Davis, CA
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