1981 GSX750 Teardown

[Zenerdiode]

So the GSX750 was bought as a non-runner. The engine in the bike has a snapped timing chain, it came with a ‘spare’ engine that apparently burns oil like petrol. So I’ve decided to see if the snapped chain engine can be repaired - it’ll need to come out either way. Removed the rocker cover; yep, no chain. Took the head off; and there’s been contact. Also, make sure you check your locknuts after adjusting valve clearances guys, I found one that escaped. It was still in the head, so I don’t know if it contributed to the chain snappage.

I’ve filled the ports with fuel, the inlet valves are still sealing. Then removed the valves and as far as I can see, they haven’t bent so I’ll lap them and I think the head is serviceable.

I removed the barrels and the top ring of each piston has snapped, but no scoring of the bores. The bores may require a very light hone or at least a glaze bust. Any recommendations on where to get the rings? CMS?

The crankcase is still in the frame, I don’t have anything to lift it out or support it as I do so. I was looking to split it in the frame, but he frame gets in the way of a couple of the journal/case bolts underneath.

Any suggestions on either getting the crankcase out or splitting it? I can see the chain all mangled up in there and hoping it hasn’t taken any teeth from the crank sprocket.

 

[Captain Chaos]

put the bike on its side on some pillows, unscrew the engine, ask some mates to help lift the frame off the engine.

Frame is much easier to handle than an engine. Of course this works best when the engine is still complete but it should be possible.