Hey everyone,
long story short; my '75 H1 developed a right cylinder heavy smoke problem a long while ago and the bike got put aside for multiple other projects at the time. The bike is now the primary project again and I've been getting her back to running condition.
The cases were split and the outer seals and o-ring were replaced again (not the first time for this bike). All three cylinders were pressure tested for 6 psi both vacuum and pressure, both showing no leaks at all. The problem is that I still have excessive smoke coming from the right cylinder which I cant seem to diagnose. The bike runs well otherwise (obviously the right cylinder is getting covered in oil and not running well, but aside from that). The smoke doesn't follow the carbs and remains in the right cylinder.
I am certain it is transmission oil and if I remove the check / reed valves at the bottom of the crankcase it will drip out the tranny oil. (if I then start the engine for a minute and turn it off, it will have new fluid it sucked in to drip out the bottom)
I cant seem to understand how the oil is making its way into the cylinder if the engine is sealed and passes a leak down test?
I will say that the crank has never been rebuilt, and the only option I can think of would be if the crank is so out of balance that it is letting the oil in as it turns?
otherwise, I'm at a pretty big loss for an answer and looking for any suggestions