Just a reminder when you line up your timming marks and #1 cylinder is up you are firing on #six. Most of you small time engine builders do not use the front or back intake gasket. Once you can fire it spray com sarting fluid on and around the intake if the motor runs diffrent then you have a sealling problem with your intake or carb. one othe thing check to make sure your timing marks are right with #1 piston tdc.