"Welded Driveshaft" - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 03-28-2011, 04:29 PM Thread Starter
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"Welded Driveshaft"

The guy I bought my bike from told me that the driveshaft had been welded a few years ago. So, I decided to do the spline shaft lube and check out the weld. What I found scares me. The coupler on the spline shaft side broke, probably due to no lube, so insted of replacing it, they welded it back together, and then welded it to the spline shaft on the final drive. Now the coupler slides on the drive shaft (which had no grease on it, but the teeth look good). Ya think this will be O.K.? I'm thinking I should just find a good final drive and replacement driveshaft, otherwise I'll always be thinking about it!
Sorry...didn't take any pics.
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post #2 of 14 (permalink) Old 03-28-2011, 07:25 PM
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Ya I'd be scared too.

I found a good rear drive and drive shaft on Ebay for 200 plus shipping. The coupler wasn't too good so I bought a new one from Cheap Motorcycle Parts. It was all worth it and very easy to change out.

FYI....My splines were worn and blew out on me out on the highway. No fun. Now I ride with confidence.
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post #3 of 14 (permalink) Old 03-28-2011, 07:30 PM
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If you have no noise in the final drive, stick with it. Get a new coupler and spline shaft for the final drive. Remember there is a spring you need in the coupler, that is if it is missing. There is also a sping clip that holds the coupler to the drive shaft. Spline shafts are sometimes found on the Ebay sight, the final drives can cost some big bucks if you can find one.

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post #4 of 14 (permalink) Old 03-28-2011, 07:32 PM
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I've got a driveshaft and coupler for sale if you need one. PM me if interested.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
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post #5 of 14 (permalink) Old 03-28-2011, 08:10 PM Thread Starter
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Quote:
Originally Posted by weh44att View Post
If you have no noise in the final drive, stick with it. Get a new coupler and spline shaft for the final drive. Remember there is a spring you need in the coupler, that is if it is missing. There is also a sping clip that holds the coupler to the drive shaft. Spline shafts are sometimes found on the Ebay sight, the final drives can cost some big bucks if you can find one.
How do I replace the spline shaft? Everything else on the final drive is perfect, so I guess it would be a waste to buy the whole thing.
The spring is there, but the spring clip is gone.
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post #6 of 14 (permalink) Old 03-28-2011, 08:21 PM
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I don't believe the final drive unit can be rebuilt. They welded the coupler to it, not the driveshaft, correct? Any chance of cutting/grinding it off? But that may not do you any good if the splines on the final drive are bad.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
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1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

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2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #7 of 14 (permalink) Old 03-29-2011, 02:32 AM
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Getting inside the final drive to service or repair it requires special Kaw tools according to the Clymer manual.

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post #8 of 14 (permalink) Old 03-29-2011, 08:34 AM Thread Starter
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Quote:
Originally Posted by flitecontrol View Post
I don't believe the final drive unit can be rebuilt. They welded the coupler to it, not the driveshaft, correct? Any chance of cutting/grinding it off? But that may not do you any good if the splines on the final drive are bad.
Yep. Welded to the final drive. The splines are most likley bad, so grinding it off wouldn't help much. Although, whoever did the welding was a pro at it. There's no way that weld will ever break.
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post #9 of 14 (permalink) Old 03-29-2011, 09:39 AM
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Wow! Talk about a redneck repair. Anyway, you need to find a replacement final drive and take up the offer on the drive shaft and coupler here. The final drive would take someone at the KAW factory to refurbish and would cost you more than you can buy a new one for probably, if it were even possible to get someone to work on it. Not really an option. Keep an eye out for ebay final drives, and insist that they shoot and send you photos of the splines so you don't end up buying one that's in poor shape. I wouldn't ride the bike at all until you get this replaced. The damage that could be done to the other end would be much more costly than a replacement final drive. That end is not designed to slide in and out and is going to heat up with that added movement and cause you real trouble in time.

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post #10 of 14 (permalink) Old 03-29-2011, 10:54 AM
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I'm still trying to wrap my head around why they welded it to the final drive? I could see the shaft it's self as that's where it's supposed to be. This is just a set up for disaster.
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