There really isn't too much difference between these engines... The FP is a bushed engine with an airbleed carb and the LA is a bushed engine with an airbleed carb. Since the FP can be fitted with a remote needle for about $10.00 there is no difference there. I think the FP is a much better, stronger, and more durable engine than the LA. 25 FPs can regularly be found here and on eBay for a very reasonable price.