You're dismissing the other very important side of the equation - torque. V-Twins have massive amounts of it. I can roll through a town with a 40kph speed limit just poking along in 5th gear and then roll into it and be doing 100+ again in no time flat without even touching the shifter.
The tractor trailer I drive daily has only 400HP (and 6 cylinders) to pull >80,000# of weight (most tractor trailers are similarly equipped, even ones pulling 140,000#+ loads), but the *torque* is what gets the job done.
True, and I like big v-twins, but on a toy vehicle (as opposed to a heavy tow vehicle), being tuned for all torque and no hp seems silly to me. I would rather pull a bunch of weight out of toys and have similar performance. For example, Ape ETV 1000 makes same torque (~70 ft-lbs), 100 hp (instead of 60) and motor is 30% smaller (in swept volume). Exact same motor in RSV is less torque but way more hp (~160 IIRC). For a truck, having tons of torque and thumping along to achieve incredible lifespans make sense. How many people are putting 1,000,000+ km on a VTX? I would rather have it wound up a bit (a lot) so it only lasts 100,000 km, that's more than enough for that style of bike.
For me, on a toy, HP should be in the ballpark of engine size in litres * 100 or better. You can easily achieve this while still having tons of torque (if desired). Obviously if you sacrifice torque, you can get way more hp than this formula presents (such as the ninja 250 at 156), but that brings a different style of riding with tons of shifts to wring the neck of the motor.
EDIT: Forgot what thread we are in. 100 hp+ bikes for new riders aren't a great idea.
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