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Front sprocket cover help!!!

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Gixzuki750

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Discussion starter · #1 ·
So I neglected to do proper maintenance on my 750 and while taking off front a light the chain link malfunctioned at about 80kpm. Passenger foot peg saved my leg from being cut clean off. The chain shattered the water pump and sprocket cover as a result. It also took a cumk off of the engine block were a bolt goes into. Is it safe to put a new cover on with only 3 bolt??? Having a very hard time finding a used motor in canada. I'll attach pictures.
Any help or advice is greatly appreciated 🙏
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#3 ·
yes, you can put the cover on, but take a good close up picture, cause you might be able to get the remaining bolt out and depending on how deep your tread is and if the broken part is still on the cover....just put a new bolt in.. or figure something out to fill the gap. but 3 bolts and some locktite your fine....next time, dont cheap out on any bike parts or maintance
 
Discussion starter · #5 ·
mallood said:
yes, you can put the cover on, but take a good close up picture, cause you might be able to get the remaining bolt out and depending on how deep your tread is and if the broken part is still on the cover....just put a new bolt in.. or figure something out to fill the gap. but 3 bolts and some locktite your fine....next time, dont cheap out on any bike parts or maintance
Click to expand...
That's great thank you and I definitely will maintain her properly going forward. Cheers!
 
#6 ·
The clutch release mechanism sits on the sprocket cover midway between the post that broke and one below it and backwards. I'm concerned about the lack of support. You might as well give it a try but it might affect the clutch feel or, worse, provide a basis for breaking the cover. Do you have the broken bits and are there any good welders who could repair the post?
 
#8 ·
You've got nothing to lose trying to put the cover on. See how it feels. It's a tough area to weld there but you may be able to find one that can do it.
Looks like you've got oil coming from the area though meaning a cracked case? Or shaft seal? Better figure that out first.
 
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#9 ·
i'm with dave, safely weld up that broken bit, if you can find the chunk that broke off even better, otherwise build up, grind perfectly flat again, retap, you need that support, consider a billet slave housing..

take better care of your equipment, it will take better care of you ..
 
#10 ·
The area in the pics is so grunged up that it's hard for me to tell but he seems to have removed the clutch push rod. The oil may just be coming out of it.

OP, time for a major cleaning.
 
#11 ·
What Billy V said about the clutch is correct. Any bit of flex is going to cause the clutch to wonky at best. I would definitely figure out the mount. Weld would be the best fix. Also the clutch rod is out and the seal looks pooched out and was probably already leaking. I believe on this model cases have to be split to replace . I have done it w/ out splitting but had to build a retainer to keep it in place.
 
#12 · (Edited)
I now see that the post that broke is one of two that uses an alignment pin. This is probably weaker than one without a pin and contributed to the failure. Also the part is magnesium, which makes it weaker. Here's what the underside of the cover looks like:

The other post that gets a pin is at the top. That's a significantly longer span if the post that broke (rightmost in the pic) isn't supporting anything.
 
#13 ·
That's an ugly chain snap incident, man. If you get it fixed or swap the motor, just clean the next chain for your own safety. All that rust dust in your photos should have been the warning sign multiple times over that you needed to first clean the chain, and then replace the chain and sprockets.

Parts can be welded and replaced, but I'd also worry about other parts bending from the chain binding up like yours did. I would take a dial indicator to the countershaft output and rear axle to check for runout, and make sure the shift shaft or anything else around there didn't take a big hit too.

If it was me, I'd drop the motor and at least remove all the peripheral items like the water pump, hoses, and sensors, just to get a good look at all the damage and anything you might have missed. Gives you a chance to check out the frame and swingarm while that's all off too.

Good luck with the repairs, wish I had more info on the welding and crankcase repair.

-Mike
 
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