Fixing the rear moutning holes on my old engine.

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Mind_Reader7

Mind_Reader7

New Member
May 1, 2010
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Northam, Western Australia.
Some of you might know that some time ago, my first 2 stroke broke a rear mount bolt. It broke it right off at the base, and I tried to drill it out. This led me to tap it out to an 8mm. I tapped it wrong and the thread ripped right out, so now I'm left with an engine with 2 large holes.

Anyhow, I've split the case, and taken everything out basically, and was wonering could these be fixed up with a simple MIG welder? Because I was thinking of just getting a friend to use a MIG welder on it, then drilling/tapping some 6mm holes.

Any imput on a better way?
 
spideyman

spideyman

New Member
Aug 29, 2010
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ontario
why dont u try a heli-coil first, fairly cheap fix and my two rear are heli-coil 1/4 20 readyrod and have lasted almost 1500 kms now.
 
spideyman

spideyman

New Member
Aug 29, 2010
30
0
0
ontario
well since the 8mm are already stripped im gonna say no to droppin back to 6mm but as long as you have enough meat around the holes to go a little bigger y not go with the 8mm studs bigger is better anyway right. the heli-coil uses a a little bigger tap so you can probably get away with just retapping the 8mm holes with the heli-coil tap provided.
 
Last edited:
2door

2door

Moderator
Staff member
Sep 15, 2008
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Littleton, Colorado
Unless you're very very good at welding aluminum, don't even try it. A standard mig machine can weld aluminum but it has to be set up correctly. You'll need to reverse the polarity and run straight Argon not C-25 mix. You'll need a Teflon liner and Aluminum wire.
Go the heli-coil route or pay a professional welder to do the work.
Tom
 
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