Yeah ok Im an auto mechanic I understand how car engines work and learning how they differ between cycle engines,which there is alot of difference.Since its only 2 cylinders it should be easier for me to grasp the concept on how they operate.Well yesterday I had a very bad day and was recovering from a small siezure I had the night before.I wasnt comprehending anything I should have just left my bike alone but its 2cnd nature for me to get up and want to do something on it.So the smart ass comment isnt/wasnt neccasary.xschris gas combustion engine 101