Your right about Ralph being above Sea level.He risides at 6,770 MSL.I live south of him a few hrs and reside at 3,000 MSL.I just am stating his correct MSL so people can figure in parimeters a little better.I dont have a 100cc engine yet but i will.And when i do it will more than likely be one of these.I am already going to be talking to Piston.