Originally Posted by hellonwheels13
I can't imagine motorcycle engines are much different than automobile engines. If I had those conditions in a car engine I'd suspect valves or piston rings.
I'd normally think so, too, but hoping it's a simpler fix. The miles seem awfully low for worn out rings. Then again, we don't know the bike's history.
One of the benefits of trying
to help others with Classic Wings is it forces me to think better about my own projects. For example, I'm currently stymied by an '83 GL1100 that only has 70,000 miles on it, sat for a long time, but I soaked the cylinders with 2-cycle oil for about 9 months before ever trying to start it. At first, I was faked out by the smoke coming out of it, thinking the rings/valves must be shot, but when I checked the spark I realized it was weak all round and the smoke was unburnt fuel, not oil. The plugs were sooty, not oily after running.
When I rebuilt the carbs, I set the air/fuel (pilot) screws to spec + 1/2 turn richer, which some experienced fellas recommended. As a result of responding to this thread, I got an idea that may or may not work: I'm leaning down the pilot screws a full turn to see if the spark I have can burn at least THAT much fuel in the mix. It's not the full solution at all, but at least the bike will run better and longer, allowing me to move onto the next stage while shopping for the right ignition components instead of just throwing overpriced parts at it.