I have just put together my 48CC motor and all appears to be well. I have two problems. It won't start when I release the clutch and the more I twist the throttle the worse it seems to be. Also how much play should the chain have. If I have it tight it comes off the cog on the rear wheel. But if it is loose enough not to come off it seems too loose and hits the chain guard. I am new to this and I am busting to get motoring.