I just finished rebuilding the carb. on my free cub 1811 today. I also changed the oil and I noticed that the oil was very thin and it had a strong smell of gas. My initial thought was the float in the carb might have been stuck open which would explain why the spark plugs were fouled. I also noticed that this engine has a mechanical fuel pump and was wondering if this style of fuel pump will fail and let gas into the motor like some of the old V8's did. Does anybody know about this?
I don't want to start this engine up until I know for sure.