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Old Streetfighter Motorcycle Forum Post 08-29-2012, 07:14 AM   #1
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Default 100 HP and under 300 lbs. possible?

If you were to build a street legal bike for the purpose of canyon carving that made at least 100 HP and weighed no more than 300 lbs. wet, how would you do it? Try to keep it as fairly bolt together as possible. ie- no custom frames, carbon swing arms, shit like that... is it even possible?

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Old Streetfighter Motorcycle Forum Post 08-29-2012, 07:42 AM   #2
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Default Re: 100 HP and under 300 lbs. possible?

Ex RS250GP bike with LEDs for lights.
Otherwise, good luck?


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Old Streetfighter Motorcycle Forum Post 08-29-2012, 08:03 AM   #3
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Default Re: 100 HP and under 300 lbs. possible?

That's <140kg in metric, which is less than a Moto GP bike (153kg last year, 157kg this year).

I think you'd have to build more on a lightweight Moto 3 philiosophy. Those bikes weigh next to nothing, and hit ballpark 65hp with a 250 single. So start from lightweight eg. RS250 which is 140kg with original pipes and all the plastics, and makes 72 claimed hp, then see what power you can get from that engine, maybe a big bore kit. Someone has done an RD350LC conversion into that chassis, these can apparently big bore to 485cc. At that point if you don't mind a strong grenade tendency they apprently can get to 120hp, so 100hp should be achievable without any more than the usual stinkwheel reliability issues, fuel thirst and expensive oil cravings.

In short, I really don't see you managing the weight requirement with a 4T.

Aaron, living near Gibraltar riding a near-stock 98 900rr around Andalusia.
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Old Streetfighter Motorcycle Forum Post 08-29-2012, 08:06 AM   #4
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Default Re: 100 HP and under 300 lbs. possible?

big boost turbo in a stripped cg 125? or nos in an equally small bike?
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Old Streetfighter Motorcycle Forum Post 08-29-2012, 08:12 AM   #5
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Default Re: 100 HP and under 300 lbs. possible?

engine from this, 95hp stock



shoehorned into this frame (entire bike 134kg/290lb dry)



and then stripped back to make as light as possible. aluminium fasteners, magnesium whatsits, carbon fibre monocoque tank/seat/fairing and wheels. done.

also.. its been done a few times..


120hp

literally at the top of my list of dream bikes.

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Old Streetfighter Motorcycle Forum Post 08-29-2012, 08:23 AM   #6
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Default Re: 100 HP and under 300 lbs. possible?

I have been pretty happy with 150+ on 480lbs..........that has to be unbelievably fun!!!!!!
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Old Streetfighter Motorcycle Forum Post 08-29-2012, 08:57 AM   #7
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Default Re: 100 HP and under 300 lbs. possible?

The RS250R weighed under 130kg wet and they made md 90's in rwhp
So, 300 or 350cc kit in it, lots of clever Honda GP advice and there's the bike!

There was some ridiculously like all carbon and magnesium 4 cylinder 2t floating around the net a week or two ago


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The mighty Dougcati 589SS 1k build http://www.customfighters.com/forums...16#post1217516
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Old Streetfighter Motorcycle Forum Post 08-29-2012, 09:02 AM   #8
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Default Re: 100 HP and under 300 lbs. possible?

Quote:
Originally Posted by dirtydoogle View Post
The RS250R weighed under 130kg wet and they made md 90's in rwhp
So, 300 or 350cc kit in it, lots of clever Honda GP advice and there's the bike!

There was some ridiculously like all carbon and magnesium 4 cylinder 2t floating around the net a week or two ago
...did you kinda gloss over this?..



silly question: why is everyone fixated on 250cc engines? or smaller? start with a big 2T engine then work your way down. hence: RGV500

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Old Streetfighter Motorcycle Forum Post 08-29-2012, 09:20 AM   #9
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Default Re: 100 HP and under 300 lbs. possible?

Quote:
Originally Posted by n0regret5 View Post
...did you kinda gloss over this?..



silly question: why is everyone fixated on 250cc engines? or smaller? start with a big 2T engine then work your way down. hence: RGV500

Because this bike weighed 400lb, which is 100lb more than he wants. Thus you can't realistically start from an RG500 to get the target bike.

Don't start by a suitably powerful bike and taking away 100lb, Start instead from a sub or near to 300lb bike and try to get above 100hp. Like a 250 two-stroke, with a bigger engine wedged into it - but the engine has to be a twin, or it's going to be too heavy. Like a 250 twin, or a 350 twin bored out to whatever you can get away with.

Aaron, living near Gibraltar riding a near-stock 98 900rr around Andalusia.
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Old Streetfighter Motorcycle Forum Post 08-29-2012, 10:40 AM   #10
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Default Re: 100 HP and under 300 lbs. possible?

On a more conventional street bike like the '93 CBR900RR, which started at a svelte (rated) 400 or so pounds dry. Also rated at making over 120hp.


Stripped to the bare bones, minimal tail, barely any wiring, tiny battery, detabbed everywhere, even fitting a 160 rear tire and 120 front in place of the 180/130 trying so desperately to hit the 340lb mark. Still yet to get it weighed, but I'm sure my end resulting power to weight ratio will hit damn close to the mark your asking for.

Modern 600's gutted of all the unnecessary bits could get down around the 335lb mark with some readily available titanium and fiberglass parts.





It's more than possible. But it's gonna take some compromises and some real attention to every part your going to use. Honestly getting into the territory of Ferrari where your drilling and milling parts to drop ounces. A build like that could get out of control really quick.

Quote:
Originally Posted by 4cups View Post
that new swingarm & shock might look the business in the shed but it might handle like a pissed pig on rollerskates out on the road
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