crankshaft and bushing problems - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 3 (permalink) Old 03-23-2012, 11:58 PM Thread Starter
hoss
 
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Question crankshaft and bushing problems

I was riding my 86 750 when I heard my motor start knocking and I lost power. I pulled over and the bike died,I started it but I could tell that something bad happened to the motor. I got a ride back home and took the oil screen out,and found metal shaving. I went ahead and took the motor out and started checking for the problem. Everything looked fine until I got to the front head when I pulled it off the rod had a lot of slack in it. Thats when I knew I found my problem the collar or rod bushing was almost completely gone. But that is not the worst of it the worn out bushing had scratched up my crankshaft pretty good. My question is what can I do to fix it ? Can I fix the crank or do I have to replace it?and I am going to need all the engine gaskets and can't find a kit anywhere any info would be appreciated.
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post #2 of 3 (permalink) Old 03-24-2012, 12:18 AM
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That depends on how bad the scoring is on the crank. you may be able to have it polished and use a oersizes bearing but you will have to mesure to find out.
You may need to get a new crank and rod if to bad.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
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post #3 of 3 (permalink) Old 03-24-2012, 12:50 AM
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Wow, a new crank is $670. You could get a used crank. One thing to be careful about is heat damage. Check the crank journal for heat damage. If it has heat damage, it will have molecular damage to the metal, and not be as hard as it once was. Such things can be fixed, metal can be rehardened, and the crank journal can actually be welded up and then machined down to the correct size. But for what it would cost, if you could find a shop to work on a motorcycle crank, it would probably be cheaper to buy a new one.

Motorcycle parts prices are insane, I could get a good quality crank for a small block Chevy for half what a Vulcan crank cost, and look at the difference in size.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
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1994 Yamaha XT225 parts bike
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