White grey smoke is usually oil burning. Its possible in could be the headgasket allowing oil to be sucked in. The gasket between the head and rockerbox usually just makes a mess when it leaks, Its possible it could run down to the exhaust pipe and cause it to smoke but I doubt that is the problem. If you have to pull the head anyway you might as well check the condition of the rings and valves while your at it.
I checked plug. Runs rich w/ s+s super e carb. (brand new). Have autolite plugs.i tried tightening them best i could but frame makes it diffucult to get at.
how does the bike run at operating temp. @ highway speed?
does the smoke from the pipe get worse when you come to a stop?
I am amusing when you say smoke from the pipe it is coming from the outlet and not from oil leaking on it?
Bike might lose a little h.p. @oper. Temp. @ h.way speed almost unnoticeable. Exactly! Smoke gets worse when i am idling @ stops. When i feather the throttle @stops more smoke emitts.