Alum brazing to fix hole in pipes?

[NYSingh]

Prior owner put a dime sized hole in each pipe (bottom side, right at the fat part of the pipe), presumably bc they couldn't get the jetting right and needed an outlet for excess oil/fuel to drain.  Been just ignoring it, but since I have the bike apart I figure I should fix them.

Was thinking of brazing on a piece of metal using aluminum brazing rods and a MAPP gas torch.  That's the heaviest duty equipment I have access to (and I don't know how to weld anyways).  But I'm not sure whether the alum is tough enough to hold given the vibration and heat.  Or could this be a job for JB weld? Any thoughts?

[m in sc]

use brass or nickel brazing rod. aluminum wont stick to steel.

You will need to get the material SUPER clean to get it to stick. 

[NYSingh]

Ordered some brass rods, thanks!

Do I have to worry about the carbon buildup inside the pipe catching fire while I'm doing this?

[m in sc]

 oh yeah. 

[quocle603]

use some flux to help clean up the area prior to brazing. Remember to go in small circles and go slowwwwwww