Ryno said:Yeah, I shouldn't have said "most in line fours" because I don't know squat about how cars are set up. Seems like lately bikes are trying some different things as well. But most in line four bikes use 1-2-4-3
Pistons 1 and 4 travel as pair and so do 2 and 3.
so when piston one is moving toward BDC on it's power stroke, 2 is moving towards TDC on it's compression stroke and four is going down on intake etc.
The older bikes with one coil per pair of cylinders also uses a wasted spark set up. Where one and four fire together even though four is on overlap while one is on compression/power