those numbers mite be a bit much now dnt u think, u may be able to get 63~66 hp out of a 500 but at those numbers it would be so jerky n hard to ride. the most hp stock is the ktm450 sxs with 56 out of the box, that was the first 450 i ever raced n it was over seas when i was 16 in 05 and it was so fast i could barely hold on, i got lapped by everts haha not funny then but it is now. we had a honda built buy varner n had 62 hp, but it was a ridable 450.

if anyone built a 4 stroke right now for rc it probly wouldnt be affordable by anyone who was in this for fun, u mite see some people in the intermediate class shelling out for one n probly a lil more in the pro classes but lets get real these engine manufactorors only want to build something thats gonna sell n those intermediate n pro drivers more then likly have decent hookups, so really there looking for the sportman drivers n bashers to buy this engine, what would u sportman drivers buy? a 150 dollar engine or 200 werks engine or a 400 dollar 4 stroke ( if its even that cheap ) engine. it wouldnt make money n thats what companies look at first. no doubt in my mind a 4 stroke would be better n it would last longer n fuel mileage would b a huge gain but facts r its way to much money to design one made for rc then ask for a ton of money for it n expect it to sell, look at the grossi liguid cooled engine, i wish i could have one but 550$+ bucks get real im in this for fun.

now a conversion kit to make a plane engine work mite be a better product to design n sell to the rc car world.