Brazing motorcycle crank case.

[Gumby919]

I picked up a blown motor with a small chunk missing from one of the case halves. Is it possible to braze this back shut and then machine it flat? Other ideas are welcome.

 

[A_Pmech]

It's an easy job to accomplish with a TIG machine.

 

[raddksn]

Braze probly not. TIG and some grinder/file/sanding. Yup can do!

 

[zkling]

It's an easy job to accomplish with a TIG machine.

Most likely aluminum, could be mag, what is it off of?

 

[Gumby919]

It's aluminum and off a kx250 dirt bike I can get access to a tig but not for a couple weeks and I need it sooner then that. I figured that was the best route but a buddy bought up brazing so I figured I would ask. Thanks for the replys

 

[tdkkart]

Run it down to Count's Customs, surely there's a TIG welder there??

 

[yhprum]

Those aluminum brazing rods will cause corrosion in the joint. JB weld may be adequate for this repair with little chance of actually making it worse.

 

[rharman]

TIG would be a piece of cake. In a pinch, I'd probably chance the JB Weld.

 

[countryroad82]

I've used that JB Weld stuff that you knead together to repair similar parts before. Prep is key like anything else. Or like others have said, TIG it.

 

[Greeny]

It's hard to get a good idea of the damage from the pic. I've used JB weld and aluminum can material to patch some pretty good holes in cases caused by a broken chain. Good prep and it can work fine.