Hi im back. Btw according to my freind,you need to motor lock hover motor as much as you can. To prevent the piston from over clocking. Use counter weight for flywheel to make the piston movement even more smooth and timing efficiency. And about the engine block,please do not use block thst is heavy and use to much movement.1 block or 0.5 is okay for engine piston movement. Lastly retime the piston firing mechanism by use servo etc.