I would use JB Weld or similar aluminum repair type product. Score the area up and make sure it is as clean as humanly possible; as soon as you think it's clean, clean it again with carb cleaner, etc. Mix the putty well, glob it on there and give it plenty of time to cure. W/o disassembly for welding, this may be your best bet.
1989 TRX250R "Red"...Mildly built with the usual goodies.
2005 SkiDoo Mach Z 1000; wicked!
1997 Ford F350 4x4 Off Road single axle, 460v8 manual tranny, 25,000original miles
1994 Robalo 2520 Center Console; twin 200 Mercury outboards
Past toys have been:
1996 Ski-Doo MachZ 780 85% Stock and still FAST
1993 Trophy 20' Center Console boat 175hp Mercury Outboard
1995 F150 4x4- 393 EFI/roller stroker, 4.10 posi both ends, built E40D
2001 400ex with the usual goodies
2005 Kawasaki ZX10R- stupid fast
2003 Honda CBR600RR
1991 Suzuki RMX250
1991 Suzuki DR250S
1989 Honda CR125
1987 XR600 "Miss Piggy."
198? Suzuki DS80