Kawi2strokes.com Forum

I reattached two fins on a right cylinder. The 3rd from top on front corner and the bottom fin on the front corner. Knocked off the fins on a already damaged cylinder, hated that. I shaped to fit and JB Welded them on. They seem solid. Has anyone tried JB Weld to put on fins? I suspect they were knocked off by whoever removed that cylinder years ago.

I love J.B. weld, but try a couple of clutchless, high-rpm downshifts from 5th to 3rd, and see if they are still there...!!

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"One day, your life will flash before your eyes. Make sure it's worth watching." : anon.

30+ years ago I used some epoxy to reattach a head fin that was broken when my steering damper bracket broke and it was either bust the fin or fall in a parking lot. It fell off a couple years ago while I was riding. I made a new one and welded it on. Sometimes it's easier to build up the piece from weld filler because you can't get to enough of the joint to just weld on a new fin.

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If it surges, that's normal, upshift.

After 30 years in vibration research & development ......I wouldn't think JB Weld would hold up to the vibration for very long.
You might lose one while flying down the road.

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Busy doing more riding than wrenching.......

Like Jim, I have found that removing the entire fin (down to the cracked/broken area) and building up with fresh weld..and then reprofiling is best.

By "Best", I mean permanent and undetectable once properly completed. I have had fins "welded on", and regardless of how good the weld is, you can still see the weld.....

As we are all aware, compounds like JB Weld, Marine-Tex, Dov-It are epoxy resins, and they do degrade over years of heating and cooling cycles. Most of these epoxy compounds are also heat barriers, and using them doesn't help get the heat transferred all the way back out of the cylinder, to the end of the fin.

The removal of the broken part, welding, and refinishing is really the common sense way to go about this task.

Just stuff to consider.

The outfit that rewelded my cylinder fin (pictured) https://sacramento.craigslist.org/mcy/4464817301.html

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"Only cheat the cheaters, boy - you can't cheat an honest man!" Mordecai Jones - The Flim Flam Man.

Here's a more permanent link: http://www.theweldmaster.com/