I was at the shop yesterday and it turns out the tube collars are a millimeter or two closer to the block than the plane of the cylinder flange. My pl...

The original tubes are still in the cylinders but I had driven them further in over the years in an attempt to reseat the old seals. Now with new seal...

Thanks Richard for the replyI'm still waiting for the return of the heads and I'm thinking about the re-assembly. I will be installing new push rod tu...

My local machine shop has said the exhaust valves and guides are beyond spec so I'm sending them off to a BMW specialist for further work along with t...

@8166 The marks on the shaft are just visual, can't really feel anything, but they don't appear on the shafts with the good bearings. The pieces of ...

@arni Hello John Sorry for missing your question from 5 months ago. I was away from the bike for some time but am back on it now. I have pulled th...

Yep, carbs were off. valves were set to 004 and 008. I'll try the exhaust sealing today

almost forgot, I noticed a fine black residue in the intake tube and the throat of the left carb, which is the side where the problem appears to be.

Finally got my hands on a compression tester. Readings are 125 and within a couple of pounds on both sides with the engine warm. The readings are a bi...

I checked the exhaust system yesterday and couldn't find any holes. I have yet to aquire a compression tester but I had thought that the carbs would n...

I will check the exhaust system over for leaks. I did do a leakdown test and it showed little difference from left to right. It's hard to get a good h...