On a motorcycle or scooter how many cc's does it take to equal 1 horsepower?a 9 horsepower motor equals __cc's

Torque = HP x 5280 / RPM
HP = Torque X RPM / 5280
1 HP = 36 lb.in. @ 1750 RPM
1 HP = 3 lb. ft. @ 1750 RPM
1HP=742 watts
however:
Kawasaki EX500 has 50 hp
Kawasaki ZX6R (600cc has 125 hp)
So: there is no correlation between CC's and HP

not sure but i have a 450cc motor and it has 42 hp, so maybe 10% of the cc or around there

I am not for certain since alot depends on how a carbuerator and exhaust set up is done. I have a 1200 cc harley but have done alot of mods to the carb and after market exhaust and power cones in the exhaust with an over sized breather intake and did a lot of work and the heads to increase air\fuel mix rate. It puts out about 90 horses right now. There are a lot of variables. A factory 883 harley puts out about 47 horses.

It depends on the motor compression ration, the octane of gas used, the rotating weight of the motor, the timing, the cam profile, and the efficiency of the carburator or fuel injection system. In other words, you cannot equate CC's with horsepower, as that is only one of the variables.

they are all different, just like you can have an 1983 chevy 350 making aobut 180 hp or a newer one making 320 hp. it depends on cams, compression, 2 stroke or 4 stroke etc. my freinds 400cc 4 stroke makes 38hp, my 250cc 2 stroke makes 50 hp. even then even in the 4 strokes only some of the smaller ones make power than larger one because they are higher performance. you just have to go by bike.

there is no way to tell HP from size. if that were true (that you could) then all engines of the same size would always have the same power and time has shown us that this is untrue