It worked good, going to change a few things, but it will go a lot better than the 750 did .. Fairly easy to ride too.. Still. Makes pretty good power, although it smokes and leaks a lot...
I think it's around 400cc, and commercial.. Some racers would get close to 50 hp out of a well built one...get up to about 485 cc with a stroker.
They sound good reminds. Me of short track races we used to go to..