Bought a '90 C-10 with the intent to switch over plastics (red) to my '86, but I'm wondering if fixing the engine would be a possible. I know it's probably impossible to diagnose here, but this is the info I have.
Symptoms from PO are:
It backfired on a ride a few times.
Parked in garage, and went to start a few days later.
Loud pop when starting. Assumed hydro-lock, and measured cylinders. All OK with 1 & 4, 2 & 3.
Petcock was leaking.
Did compression test, and 1 & 2 were good, 3 & 4 would build pressure and then drop.
Put oil in cylinders 3 & 4 and hit starter. Oil blew right out.
PO thinks it's valves?? If I could get some idea of what it might be, and attempt to fix it, I may try. It would be a shame to break this bike up and part it out because it's in great shape cosmetically, with some nice farkles. I'm no mechanic, but I have been able to wrench with the manuals and help here. First valve adjust last week, carb rebuild, shock change etc.
Any help would be appreciated. If it is too much to fix, then I will part out.