Hi, well we might have figured it out I didn't think about it but could the engine be out of time??? The reason I ask is this when he first got the engine first thing he done was tried to tighten the glow plug up like superman and striped out the threads. He had to order a new top assembly so he striped the motor down could he have put it back together wrong??? He e-mailed the place about the engine and they told him that thats what it sounded like to them that it was out of time they told him they would fix it for $35.00 but he thinks that is too much money.