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Old 01-07-2014, 03:58 AM
BarelyAWake's Avatar
BarelyAWake BarelyAWake is offline
Motorized Bicycle Elite Member
Join Date: Jul 2009
Location: Maine
Posts: 7,212
Default Re: whats the largest 2 and 4 stroke motor your willing to intstall in a bicycle ?

I've honestly no idea why so many reference, even buy these engines based on CCs - if ever "there's no replacement for displacement" was a misnomer, it would be in reference to motorizing a bicycle lol

There's 50s pushing 12hp, there's 200s with a mere 5hp - there' no correlation between displacement and HP in our world, particularly as both are so oft suspect in any case...

...regardless, to answer what I think was the OP's intent - think me an ol' fuddy duddy if you must but for a street bike & even legality aside, I really can't fathom needing much more than an actual 5hp (I run about 1/2 that w/my most powerful build & a mere 1.3hp w/my daily driver) as there's an additional, even critical aspects so often ignored - which would be the machine's overall power to weight ratio & the engines preformance envelope, ie it's usable RPM range & torque as well.

These are the snarky lil details that'll getcha lol, dunno how many times I whipped a "manly" CR500 w/my lil "wuss bike" XR250, to be whipped in turn by some sassy 80 despite the massive power difference - just & only because the weight differences.

Yet, I do understand there will always be someone that says, "Ya outa stuff a 350 V8 up in it man" no matter what "it" may be
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