who knows about this motor i have a 21 force and would like to know more about it also i pulled it apart and forgot witch way the piston came out [ you know that oil thingy on the conrod ] thanks

Yes, there is a small pin hole at the bottom of the rod. This should be facing the crank opening in order for the rod bushing to be oiled.

Ryan

thanks ryant888 do you mean that it must face lets say the fly wheel end or the back plate

The oil hole in the rod must face to the front of the motor so it gets oil from the intake. The piston also has a longer lower area on the bottom that faces toward the exhaust port.

Exactly

In most cases

Ryan

That was in laymans terms, its acually called a piston skirt.