I don't smoke, but I did plenty of swearing, knuckle scraping, and there's a scrapper car sitting out here I kicked a few times. Turns out the things that seemed like a head gasket were coincidences on an old bike. Greasy stuff in the coolant flushed out and didn't come back. The oil did look like bubbles but I was panicking, and it settled out fine. Coolant is still full after a proper burping.
Did the carbs 3 times, plus pulling the jet chamber covers while in the bike to check again (yes, it is possible). Acid washed and phosphate treated the tank. New fuel hoses and inline filters.
It's still doing the same thing, but I figured out a new trick for troubleshooting CV carbs. If I let in extra air, it's no different. If I pull the right (rear) coasting enricher cover ("air cut valve") and block the passages, it goes rich like it should and picks up the 2nd cylinder (mostly). I don't think weak spark would react that well to richer mixture, so it's either not getting fuel or it has an intake leak. And I've sprayed carb cleaner all over it with no noticeable effect. Pilot screw is several turns way the f*** out and it started hitting occasionally.
I swear these carbs are clean and the float is working though. I even shot carb cleaner from the pilot jets out through the pilot fueling holes, so the passages must be clear. When I had the jet covers off, I replaced the pilot jet with a different one. Both are clean, both had the same resistance to blowing through them. No change.
Is there anything I could be missing? I haven't felt well or slept well for a while for several reasons, and I'm about to dump this thing in a river. I really need to get it sold before the spring rush and tax refund season are over.
Last edited by Hexadecimus; 02-28-2017 at 04:45 PM.