Two things you can do to help cooling. Use a fake raidial of some type to block off the inlet air except the location of your engine cylinder cutout. You can cut a C-shaped hole in the bottom rear of the cowl to allow the air to escape. Nobody will notice the hole on the ground or in the air. I did not find it neccessary to cut out much in the rear though and I have had no problems with cooling. Four strokes can be run a little rich to help the cooling. Here is a photo showing the rear of the cowl. You'll notice there are outlets for the air due to the exhaust cut-out and the scale outlets. If you get the inlet built right, you should have enough airflow.