ive ordered a stock tomos 50cc factory cylinder and piston kit from Denny's llc and dont understand why the piston doesn't have windows. But treatland has the stock factory 50cc tomos cylinder and piston that has windows in the piston? Why is treats and Denny's selling factory cylinder for tomos and the piston doesn't have windows and the other does?? Anyone understands that help me understand! I don't want to loose torque without boost ports on a piston?