It might just be me, but it seems like I can't get the revolutions like I used too. With the plugs out it will rotate like no other. I'm not very smart when it comes to sleds, I'm more of a car guy, but always willing to learn. Even though I know this isn't the smartest thing, I can burn off the gas in the cylinder with a long lighter and get the piston to go down no problem. I thought maybe I was getting too much fuel so I drained my carbs and put just a few drops of gas in each cylinder, but it still don't even want to start!