I like 65 Sportsters. However I feel it would be a bad choice for an LT-40 for one reason. The Sportsters like big props. They will swing a 14" easily. You may run out of ground clearance. The power is fine, not too much. Just the bigger props it likes may leave you with too little prop clearance. BTW The 65 Sportster does not like a lot of rpm's. It's a torquer so prop accordingly.

Mark Shuman