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how to repair broken engine fin

Started by cgreenland, August 19, 2003, 01:07:33 PM

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cgreenland

okay, so apparently some ass knocked my bike over on its right side because there's a broken-off corner of an engine fin and my clutch cover gasket is leaking, my bar-end is bent, and my muffler is scratched...

QUESTION: will this broken off-fin affect performance?  it's a triangle about 3/4" x 3/4" x 1".

QUESTION2: i have the actual fin piece; how can i put it back on?  what sort of adhesive will secure it without being a hazard?  jb weld perhaps?  anyone else gone through this?
It takes 43 muscles to frown and 17 muscles to smile, but it doesn't take any to just sit there with a dumb look on your face.

JamesG

It wont' affect it other than looking uh... broken.

I doubt any kind of glue will last.  You might be able to have it high temp braized back on or even welded but that will cost you a bit and/or be a pain.

Best bet is to paint over the broken edge and call it character...

sorry
James Greeson
GS Posse
WERA #306

pantablo

if you have the broken off peice try jb weld-you've got nothing to lose.
Pablo-
http://pantablo500.tripod.com/
www.pma-architect.com


Quote from: makenzie71 on August 21, 2006, 09:47:40 PM...not like normal sex, either...like sex with chicks.

Gisser

Yes, JB Weld can do the job.  It worked for me.  I made sure the fin remnant was pressed flat so it looked right, then slathered some JB-W along the broken edge, then refitted using masking tape on top to hold it 'til cured.  Put some build-up along the seam underneath the fin for reinforcement.

The Buddha

JB weld will give up soon enough and then the piece wont be around anymore...I am with JamesG...aluminum weld/braze it or leave it alone.
Cool.
Srinath.
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I run a business based on other people's junk.
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octane

I vote for character. I broke my front tooth a while back, but the JB Weld only held the busted piece on there for a few months, so I just leave it alone now.

Rema1000

> I broke my front tooth a while back, but the JB Weld only held the busted piece on there for a few months.

Don't bother with the broken tooth, Octane: I broke-off one front-tooth on-purpose: now I a have 15T front gear!   Loads more horsepower down-low!
You cannot escape our master plan!

EricRat

Maybe tig, don't know much about tig.

Go to www.tinmantech.com.

Read up on brazing on their site. They can sell you a low temp aluminum brazing rod to put it back on. A propane torch ( or two) should be enough heat.

Bad for the the paint.

Gisser

JB Weld has held my broken fin on for 7 years so far.  I'm impressed!  I did do a nice job WRT application of the product.  TIG welding might be a bit awkward, but it only needs to be tacked on in a couple spots.  Do not waste time with alum brazing; it won't work.

Pkaaso

Quote from: pantabloif you have the broken off peice try jb weld-you've got nothing to lose.

If that don't work, dill some holes and just Zip tie it!
I don't want a pickle, I just wanna ride on my motorcycle. - Arlo Guthrie

Mat

Quote from: Pkaaso
Quote from: pantabloif you have the broken off peice try jb weld-you've got nothing to lose.

If that don't work, dill some holes and just Zip tie it!

HA.  good one :nana:
Matt with one t
www.pashnit.com/
91 gs500e
04 cbr600rr

zoltan

i think be wary of welding it on because it's so close to the cylinder. if someone doesn't know what they're doing they may apply too much heat and possibly warp the cylinder slightly? don't know if it would, but something to consider.

cgreenland

i'll probably give jb weld a shot; if that doesn't work i'll just chalk it up to character...going for the der honk look.  :mrgreen:
It takes 43 muscles to frown and 17 muscles to smile, but it doesn't take any to just sit there with a dumb look on your face.

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