Bought a lemon deciding what to do with it.

[canorthup]

I currently have a 79 CB750K, and I just bought an 81 CB750K for $300.00. It looked to be in great shape so I mainly bought it for the gas tank and side covers and figured the rest was just a cherry on top. The guy said he rode it all the time and it ran when parked it last year. I didnt beleive anything he said because the tabs are from 2014, it has 9k miles, and the plugs look new but the wires are completly gone, so I knew there was no way he was telling the truth, but anyway, when I got it home and looked it over it was acctually in to good of shape to just part it out. Except I tried to start it and it just clicked and nothing. I thought it wasa the starter so I removed the cover and pulled the sprocket and the starter worked great. Then since I had the cover off I tried to manually turn the motor over. it seems to be stuck in two spots. I pulled the valve cover off and as far as one can tell everything looked correct I think ( I could not see if the timing was off due to where it is stuck) But the timing chains feel like they have the correct tension. I scoped the pistons and didnt see any forign material.

After all of that should I just stick with the orginal plan and just part out the bike, wait for a motor to come up cheap, or take the motor out remove the top end and rebuild? I have not done a complete top end before, but it does not scare me, but I have other bikes and projects that I want to take care of as well.

Just wondering what other people would do in this situation. or if I am completely forgeting something to try.

 

[SenseAmidMadness]

Sticky in two spots makes me think it may have jumped timing and bent a couple valves. Is it difficult to turn over by hand with the spark plugs out? If it's only difficult in two spots with the spark plugs in, it could have lost compression on a couple cylinders...

If it bent valves by slamming them into the pistons, it'd need a lot more than just a top end. You'd have to split the cases open, make sure the connecting rods weren't bent, replace the pistons, probably replace the entire cylinder head...tons and tons of work and cost.

9,000 miles would be unusual for a motor to suffer a catastrophic failure, but not if it had a bad enough Previous Owner.