1981 GS650 E broken crankcase

[ncint2]

Hey guys I have a broken lower crankcase and was wondering what are my options for fixing it, I bought a lower crankcase to replace the broken one but after more research I found that they’re made as a set. Would I still be able to use the new lower part or could I possibly reweld the broken piece back together. Or should I just say forget it and buy a matching set somewhere. Any advice is greatly appreciated

[rphillips]

scrap that one and find a replacement, finding a complete ehg may be the best approach....Just wondering is that an eng. you've been running then it broke? or is it something you've got and don't know anything about it.

[ncint2]

If I find a crankcase set could I use all the internals I have already and just throw them in or is it actually better to find the complete engine. It was non running when I bought it for 100 dollars, it cranked and started for a couple seconds for a while but then just made a loud clank and it didn’t start anymore, I opened up the clutch cover and found part of the clutch basket was broken also, kinda bummed since I thought I had a mostly running motorcycle.

[Nessism]

You need a matched set of cases. I suspect a good many of your internal parts are usable, but not all. You should focus on making sure you have the proper crankshaft bearing shells. I've never built a 650 so I'm not familiar, but no doubt, the factory service manual details out how to match bearings to crank.

[ncint2]

As far as I know mine does not have crankshaft bearing shells, it has ball bearings and holes for the pins to lock in onto the crankcase. As for buying a new crankcase set, should I buy only gs650e or do gs550 or gs650 models also work, I know that the gs650 e is just the gs550 lower with gs650 upper half

[rphillips]

From what you say, You got real big problems. to answer your question, yes all the inner parts should fit fine. Beware there are differences in the 650E and 650G engines. The loud "clank" and the broken clutch would point me to finding a complete eng., which is also a gamble.

[Nessism]

As far as I know mine does not have crankshaft bearing shells, it has ball bearings and holes for the pins to lock in onto the crankcase. As for buying a new crankcase set, should I buy only gs650e or do gs550 or gs650 models also work, I know that the gs650 e is just the gs550 lower with gs650 upper half

Ah, E model. I missed that. So roller crank. Again, you need a matching set. No mix and match.

[ncint2]

I'll try finding a complete engine then, do you guys know what I can do with internals then, I have everything labeled and sorted so could I try selling it or giving it to someone. Again thanks for the advice