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Old 02-12-2013, 12:14 PM   #1
HardWorkingDog OP
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Best solution for gouged swingarm at pivot

During a long, multi-week Baja trip I got complacent with checking my chain and managed to grind the lower leading edge of the swingarm pivot head with the chain on my WR250R.

It took about 3mm of the existing weld bead, and then about 2mm into the swingarm head itself. It's not all the way through into the bearing area, but I have no idea how much material is remaining.



I'd appreciate hearing from knowledgeable welders/metallurgists/swingarm hackers on how best to recover from this. Options I see are:

1. Replace the swingarm--I see used swingarms on eBay for $125-175. Could just be getting another set of problems from a most likely wrecked bike.
2. Get it welded. Don't know if this will do more harm than good, considering the to-me unknowns of the swingarm composition, heat treatment, potential for deformation around the bearing surfaces, etc.
3. Fill with quicksteel-type epoxy.
4. Leave as is.

All of the options include replacing the chain slider ("seal guard") and chain/sprockets.

Thanks!
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Old 02-12-2013, 12:58 PM   #2
dmn0507
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The pic was taken a bit too close go get the idea of the entity of the damage but here are my 2cents anyways:

I'd go either for #1 or #2 (pick the cheapest solution) if u don't feel comfortable to leave it as it is
3 and 4 are pretty much the same, except for the cosmetic difference

Epoxy might be worth applying to the new (or welded) swingarm, in case the chain will try to grind it again it should take some more time before digging into the metal.
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Old 02-12-2013, 06:31 PM   #3
Saltydog86
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4. Leave it as is.

Then replace the slider and but a 14t front sprocket on.


That's what I did when I had the same issue as this.
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Old 02-12-2013, 07:44 PM   #4
Beezer
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plenty of metal there still... I'd leave it alone other than file off the ridges. then maybe build a slider or add on to one so that it extends a bit farther to cover the tube. another option would be to get a piece of steel & stick it with RTV so if the chain gets loose again it won't keep cutting into the swingarm. either that or ignore it & keep the chain tensioned
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Old 02-12-2013, 07:55 PM   #5
KustomizingKid
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Leave it... If it starts cracking, weld it. The worst thing to do is to fill it in with some epoxy crap that does nothing structurally and keeps you from seeing cracks propagating.
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Old 02-17-2013, 06:03 AM   #6
concours
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Leave it as is. 35 years fabricating experience. It's just fine.
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Old 02-17-2013, 08:22 AM   #7
HardWorkingDog OP
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Thank you concours, KustomizingKid, Beezer, Saltydog86 and dmn0507. My compulsive side would like nothing more than to replace the swingarm but I think I'm just going to leave it as is. And keep a close eye on it.

Really appreciate the replies
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