I'll probably cut some louvers in it, But really, without the plastic cover and tins, the fan won't do any substantial cooling. You'd have to direct the air to the cooling fins on the cylinder somehow. Having it sealed up won't make the engine run any hotter either. The heat on these motors builds up around the cylinder and especially the exhaust port. My thinking is that i'll be moving most of the time on this bike, and when stopped, it will be at idle. These little 49cc HS motors actually have some serious cooling fins on the cylinder and head so it should be fine. My other bike is a cb750 which is 100% air cooled, no cooling fans or shrouds whatsoever and never had a problem with it lol.