Mid 1950s AMC 500 single engine, some oil smoke from exhaust
Posted: Sun Oct 02, 2022 5:45 pm
Greetings All,
No oil smoke visible in the mirror when progressing, no oil smoke visible immediately after stopping (with hot engine idling), some puffs of oil smoke from the exhaust if idling continues for more than a couple of minutes e.g. local railway level crossing. Oil tank does not need topping up between oil changes (approx 1000miles), spark plug can get a bit "crusty" , which suggests burning oil, but the plug is changed every year so the crustyness doesn't appear to affect engine operation.
Crankcase breather is clear.
Oil return to tank looks OK.
Bike starts and runs well (first kick this morning, with an audience)
Not a big problem in the general scheme of things, although annoying. I plan to look at the easy solutions to start with:
Adjustable oil feed screw for the inlet valve guide (several useful posts on here, thanks)
Oil feed for the exhaust valve guide (several useful posts on here, thanks)
I currently use 20w50, I might try straight 50 as an experiment
Any suggestions to add to the list gratefully received !
No oil smoke visible in the mirror when progressing, no oil smoke visible immediately after stopping (with hot engine idling), some puffs of oil smoke from the exhaust if idling continues for more than a couple of minutes e.g. local railway level crossing. Oil tank does not need topping up between oil changes (approx 1000miles), spark plug can get a bit "crusty" , which suggests burning oil, but the plug is changed every year so the crustyness doesn't appear to affect engine operation.
Crankcase breather is clear.
Oil return to tank looks OK.
Bike starts and runs well (first kick this morning, with an audience)
Not a big problem in the general scheme of things, although annoying. I plan to look at the easy solutions to start with:
Adjustable oil feed screw for the inlet valve guide (several useful posts on here, thanks)
Oil feed for the exhaust valve guide (several useful posts on here, thanks)
I currently use 20w50, I might try straight 50 as an experiment
Any suggestions to add to the list gratefully received !