found this today, $6,500

http://allclassifieds.com.au/c/ac?a=vc&i=1316514365

p.s. not my car

Yeah I tried welding aluminium a few months ago (gearbox housing from my '69 corona was snapped in half) but the aluminium wire wasn't strong enough to feed through the MIG, it just bunched up in the feed mechanism...so the corona's on blocks until I come across a cheap bearbox.

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Get a new gearbox housing...sounds expensive, considering I paid $50 for the bike and its just gonna be something to thrash on the farm...I'll give the solder a go, and if that doesn't last then I'll look further

I got it out.

ended up drilling enough out of the head of the bolt that I could use a screwdriver and hammer a notch in the rim of the bolt, then it was just a matter of putting the screwdriver at the right angle, and hammering it around in a circle. It wasn't corroded, just in really tight.

I got the cover off and found that the chain had at some stage slipped off the front sprocket and chewed a hole in the alluminium gearbox housing, its less that 5mm long and 2mm wide, but it lets all the oil out. Thinking of filling it with solder...any ideas?

thats a good point about removing the cover to expose more of the bolt...if the punch doesn't work then thats what I'll try.
Thanks

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Too much effort

thanks Autokat, thats just what I needed to know does the plate on the shifter side of the gearbox seal anything in, or is it just a cover...Im thinking i might just drill the head off the bolt and not replace it

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This still wouldn't have helped, coz someone else had already stuffed the hex bit

I'd send a photo, but then you'd all realise the bolt isn't in a Datsun, its in the gearbox of a moto...sh*t, did I just let the cat out of the bag?

I'll try and get a photo up...might not be till tomorrow

I'll try using a punch tomorrow, sounds like it could work. Failing that I'll have to take it to the farm and use the MIG to puta bolt head on it. Thanks for the advice, I'll let you know how it goes.