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mnichols

Case... Can it be fixed?

29 posts in this topic

Well, just had my engibe rebuilt and took it our for my first ride on it. Long story short, it threw a chain. Cleaned the bike up today, started it and now I see where my oil leak came from after the chain came off. I have a small crack on the case behind the front sprocket (where it's still flat and starts to meet where the clutch cable goes in)... can that be fixed or am I looking at a new case? Thanks

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You could always put some JB Weld on it and that fixs those types of issues really well. Without seeing the crack I would be very curious if it is a crack. There are many casting flaws that look like cracks and the chain throwing oil or a leaking counter shaft sprocket seal could be the real issue.

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CAT Epoxy

They sell it in small mixer cups.

Lets see a photo.

I would worry more about gettting the shavings out.

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I'll try and find my camera and post a picture. It's more of a puncture/crack. When I did it, I thought the oil came from the seal so I stopped at the bike shop on the way home and ordered a new seal, chain guide and gaurd. After cleaning it today, I see it's not the seal.

I stared the bike and that's when I saw where the puncture/crack was by the oil coming out pretty good. Thanks

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I have seen jb weld, seal these types of cracks up well. As long as the surface is clean, it will stick and then you can sand it down to look almost flat and repaint that side of case with pj1 case paint. My buddy did it and it looks almost like stock. If you didnt know it happened you wouldnt even notice it there

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I know some of the parts on my 426 are magneseum (I think it is just the valve cover and the flywheel cover)... which cannot be welded, but if your case is aluminum, go to a machine shop and have it welded, as long as you are sure there are no pieces inside the case. A good aluminum welder can patch it up and file it down and it will almost look like there was no fix done.... really do need to see pics though to make a good recomendation. JB weld or other epoxies are pretty awesome, but I would be scared of them coming off while you are riding and relieving you of all your oil... bad news for you and the trail

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Tig welding will kill that seal and with oil in the joint it will not weld good at all....I would clean the area and try the CAT sealant....Welding would require dis assembly to do it right...

BC

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i am a welder, and get it welded. Do it right the first time.

jb weld and epoxy glues fall out after a while, especially when adhering with oil contaminated surfaces . then if you do decide to get it welded, the welder has to grind out where the epoxy was because the glues have contaminated the good weld area,making a bigger hole to weld. glues does not mix well with filler material.

My two cents worth with dealing with glue patch jobs.

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For some reason my camera will not focus when I try and take a pic that close. The seal that is in there is the old one, I have a new one that I haven't put in yet. Do you think it can be welded without pulling the motor, seems like it could be? Thanks

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For some reason my camera will not focus when I try and take a pic that close. The seal that is in there is the old one, I have a new one that I haven't put in yet. Do you think it can be welded without pulling the motor, seems like it could be? Thanks

Thats a question you would want to ask a professional welder. If I was you, I'd load the bike up and take it to a welding shop and ask their opinion.

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I would take the advice to load it up and see what a professional says, it won't cost you a ton of money to fix and will last forever, or until your chain decides to hook you up again.

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A note about JB Weld. I had an 05 CRF and the clutch cover on those are magnets for the lever to go through, mine did early on causing it to have oil pour out. I cleaned the outside and JB Welded it and it lasted over a year until I sold the bike, with the JB Weld cover still on it. Never leaked. No doubt welding would be the best option but may require more effort, money, and time.

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Called around to a few places and it sounds like the motor will have to pulled, split the case, etc, etc. Not what I wanted to hear after just getting the bike back together. What sucks is that I had new front/rear sprockets and chain on order that just hadn't shown up before taking it riding.

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hope this works.?action=share&pic=IMG_0003.jpg

The link works, but if you copy and paste the 'img code' into your message the pics will show up here in this thread.

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