RE: 50CC REVOLVER!!
Just a couple of quick notes on the final steps of construction.
When using a DA-50, the spinner back plate to cowl space winds up to be close to 1/4 inch. That is with using 3" standoffs. 1/4" space is just a little too much of a gap. To remedy this, I cut small 1/2"X3/4" pieces of 1/8" plywood, drilled a hole and epoxied them onto the firewall, over the holes where the cowl-mount bolts go through the firewall and into blind nuts. This spaces the cowl out 1/8" and gives a good spinner-to-cowl gap.
Secondly, notice the relatively anemic bead of glue that holds the plywood cowl-mounting ring onto the rear of the fiberglass cowl. That small bead of glue is not going to hold that plywood ring to the cowl for very long. I had the GP 55cc Yak with the same ring and it needed to be reinforced after it broke free from it's thin bead of glue. To remedy this item, mix up some 30-minute epoxy and get some 1" fiberglass cloth and reinforce the inside of the cowl and ring. You'll be glad you did.