Compression loss

[norcal]

How then would you explain all the guys running non-specific motorcycle oil (including lots of Rotella users) and yet this is the first alleged problem traced to it's use I can recall, ever?

I'm giving my experience, not attempting to explain things I have no experience with, that being other bikes and oils. If it makes no sense to you, that's no problemo for me.

 

[norcal]

My bike is back together, and I've ridden it to Colorado from Cal and it runs great.After reassembly the compression was around 190 psi per cylinder so the rings are good, as they should be with only 29k miles. The problem was the use of Shell Rotella oil for about 27k miles. As I mentioned earlier the throttle butterflies were coated with soot on the back sides (from the crakcase breather hose), and enough carbon collected in the head that the exhaust valves weren't closing completely. The exhaust valves had small deposits of carbon spots on the mating surfaces. The valves weren't ruined but being that far into it the best course was to put in new exh. valves.

I'll be using motorcycle specific oil from now on, not something made for deisel trucks.

At 158,000 miles, I have had no problem with Shell Rotella oil.

The oil was not your problem.

Synthetic or non? Could be it was something else that caused the carbon deposits on the valves and the soot in the throttloe body tunnels and on the butterflies. Perhaps there is an internal vapor baffle near the crankcase breather that is missing, but I saw nothing like that in the manual.