Help i cant get this motor to run. i have followed all the instructions on how to start it but all i can get is it to try only when i am pullin the starter cord, i have bought a new power head for it that had great compression and was the same year as the old motor on it. i had been told that this motor used to be hard to start but i know people who have the same motor that can pull it a few times and get it to start right up. also i had the power head all apart when i first got it to clean it up, could it just be that if i put the pistons back in it wrong that that could be me problem. i cleaned the points up also and it has very strong spark on brand new spark plugs. any help would be great appreciated. Jacob Mehler