If it’s a crankshaft/bearing issue I think you will find it best to start shopping for a good used motor. From what I understand main bearings are impossible to find in any size let alone the size you end up needing. I had the same dilemma with my bike this year, although my bike was still running good. I saw small gold flakes in my oil while changing the oil. I didn’t even bother to take it apart to find out which bearing was failing. I’ve put a used motor in this winter and it’s ready for Spring. You will still be able to use all the parts you bought on a used motor. A used motor is also a gamble so you’ll want to inspect possible used motors closely. JC has tips for what to look for and how on his Motofaction website.
What sucks is that this was supposed to be my "good used motor". I purchased it to replace the original engine on my 500 with 65,000 miles. This motor only had 13,000. I still have the original motor to scavenge parts from so hopefully they aren't beyond their expiration date. Anybody near Winchester Virginia that would like to help a fellow out?
I feel for you. I’ve had that kind of luck all too often. Since you have the heads off, is there any evidence of a stuck piston on either cylinder? Like I said before, it doesn’t make sense that it spun freely when you took it apart and then mysteriously seized before complete reassembly.
I'm back after a short hiatus with family issues. I have removed the pistons from the engine and when I turn the crankshaft it is still difficult to turn. It does turn but it requires a some force. The pistons seemed to be ok with the exception of the rings. there was some rust on the right side piston. The bearings looked to be ok but I still need to measure them and see if they are still in spec. My next task will be to remove the crankshaft and see what's up with that. Pictures to follow later today.
On my '82 CX500, the front brake switch broke. Anyone have an idea where I can find one or one that will crossover from some other rig? Tried Babbitts online, they don't have it.
Any info is appreciated.
Finally, got around to replacing oem vacuum valve, with this recommended replacement.
However, as soon as I removed the fuel line, leading to the carburetor, I noticed the nipples
are different sizes. Original is larger than replacement.
Did I receive the wrong valve? Is mine, really, not...
So carbs are back in the bike after cleaning, it started up first turn (great sign), idles just fine and will rev to around 2000 rpm, then starts coughing when I open the throttle more. Strange thing is that when I cut the fuel supply off at the petcock, just before it dies, it revs to around...