Originally Posted by
Davidka
HRC's Honda CR450f's make 70+ hp on the track today. I have never heard of a CR500 built to make that hp # for motocross because they were so hard to ride.
Snowmobiles are probably a better study since their weight and clutches allow engine builders to go crazy with the power and they have developed them over the time that the motorcycle guys have given up on 2-stroke.
For model engine purposes I think the potential of the 4-stroke is easier tuning, better run time and a more usable, lower RPM powerband.
That may be true. But, probably over $10 grand in high performance parts to make that power. Little bit of work and a 500cc 2-stroke will make same power and not as much money either. That is why a Factory race bike to build now is 60-100 thousand dollars if you had to build one.