Broken teeth on rotor - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 15 (permalink) Old 08-16-2013, 11:56 AM Thread Starter
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Broken teeth on rotor

OK been having some strange noises coming from the front part of the crankcase, so I decided to break her down this weekend. I was afraid it might be the front connecting rod bearing. However when I got to taking the flywheel cover off I found three pieces of gear tooth sitting in there, and after pulling the rotor discovered it was from the back gear on the rotor. It appears so far that I was really lucky and the broken teeth did not find their way into the rest of the engine, though I am gonna pull the heads while it's out and waiting for parts just for some inspecting/carbon cleaning. What I would like to know is what could possibly cause this? Has anyone else seen this before? I see no other signs of damage and no marks on the damper gear that look like it may have been aligned wrong.

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post #2 of 15 (permalink) Old 08-16-2013, 12:00 PM
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YIKES! Never seen anything like that on a bike. I have seen teeth sheered off by the starter on other vehicles I've owned. By the looks of things, it would have taken some serious force to break those teeth off like that!

Good luck!

EDIT: Look at the worn areas of the teeth. Looks like close to half were rubbing while the other half is clean. Also look at the length of the teeth. Not all are the same length. Possible the rotor is warped and those teeth were the weakest link or the shaft it mounts to is out of round? *scratches head*

I only understand what I don't understand.

Last edited by blazblu82; 08-16-2013 at 12:04 PM.
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post #3 of 15 (permalink) Old 08-16-2013, 12:13 PM
..have a vulcan good day!
 
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Quote:
What I would like to know is what could possibly cause this? Has anyone else seen this before? I see no other signs of damage and no marks on the damper gear that look like it may have been aligned wrong.
Ouch !

No, never.
WilliamTech

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post #4 of 15 (permalink) Old 08-16-2013, 12:16 PM
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Yeah, that's a new one.

Hey, have you bought a new rotor yet? I've got one sitting in my garage.
I'm sure we could work out a fair deal.
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post #5 of 15 (permalink) Old 08-16-2013, 12:18 PM
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Look at the edge all around it, it's worn too. Very strange.
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post #6 of 15 (permalink) Old 08-16-2013, 12:32 PM Thread Starter
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Yeah the more I look at it I think I got an unlucky buy from ebay. Couple months ago I replaced my original rotor because it was gouged from a fried stator. Looking at my balancer gear there are no marks at all that line up with the worn areas on the rotor gear, so I have to assume it came like that and I just didn't notice, maybe the teeth were already cracked/worn when I installed it. Well I'm just glad nothing else seems damaged.

Kanuck I'll send you a PM on that rotor.

Last edited by NM750; 08-16-2013 at 12:37 PM.
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post #7 of 15 (permalink) Old 08-16-2013, 02:08 PM
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the closest thing I ever saw to this was this

http://s376.photobucket.com/user/mer...le%20Sprockets

suggest you try to find a new one and get oem, not ebay or aftermarket. good luck.

kenny

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post #8 of 15 (permalink) Old 08-16-2013, 07:51 PM
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Originally Posted by Mercury View Post
the closest thing I ever saw to this was this

http://s376.photobucket.com/user/mer...le%20Sprockets

suggest you try to find a new one and get oem, not ebay or aftermarket. good luck.

kenny
The difference there Merc, is those gears are worn out on chains.
The broken gear teeth on the rotor are not just worn off, but broken off. Very odd.

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post #9 of 15 (permalink) Old 08-16-2013, 08:02 PM
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Scary stuff....mebbe I should sell mine quick and get that sweet VN900 Classic I liked...lol...good thing I have a spare 700 (hugs Mikey....).....

Looking at the damage....Id say it was an improper install, and a wobble/wear caused it....I dont think the cog was seated properly from the get-go....

But thats wobble wear fer sure.....



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post #10 of 15 (permalink) Old 08-16-2013, 09:48 PM Thread Starter
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I'm with ya Wolfie, but I'm also sticking with my theory that I got it already worn because I just can't see how it could end up like that from my install if my balancer gear is pristine.
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