72 hp 250R?????

[Grande Huevos]

hears the deal..... im picking up an R this weekend and the guy tells me it has a 310 pro x cylinder that has been ported and polished with a cool cool head a wisco piston and high comp dome runs a 50/50 mix of 114 and 92 oct fuel. standard length hot rods crank, 41mm flat slide mikuni carb, carbon fiber reeds on boydseen rad valve also ported, k&n filter, pro circut pipe and silencer, hinson billet proof clutch basket?, and an HD tranny up grade? He says it dynode at 72 HP!!!! is this realistic??? any info or opinions on this setup are appriciated thanks!!!

[twopump78]

sounds to me that 72hp is way too high, I would guess maybe 40 to 50 would be more in the ball park

[89trx250r]

theres a guy on here ace carlos who has either a 310 or 330 pro x on race gas and his was dyno'd at 68 horses so id say your lookin more realisticly at probbly 55-58 around there

[8686]

Assuming your description is accurate, it's not making 72 hp at the rear wheels. It is almost certainly not even 62 hp at the rear wheels. In fact, based on the setup with 50/50 fuel and some of the other details, IMO 52 rwhp would be a stretch.

[Grande Huevos]

yeah i fig he was blowing smoke it seemed extremely high to me but i wasnt for sure? i was guessing 52-56??? either way its a nicely set up bike and looks hella good!! 4" extended axle -1 Leagers swinger leagers a arms +2 leagers stem peps tripple rate shocks peps steering stabalizer, large clear clark tank ac nerfs and ac front and rear bars! i will post pics when i bring it home

My 330R puts out 68-69HP at the rear wheels on 110 race fuel @ 230PSI after extensive work to the engine, pipe and carb. If you are putting out 72HP at the rear wheels, it is one heck of a 310R.

I have heard of 70HP 310’s heavily modified, however; I have not been able to have any builder achieve that kind of HP, you will certainly know it once you ride it if it approaches 72HP.

Carlos.

[machwon]

I new of one 310 that put down those kind of numbers, new piston every day at the dunes. It was on alky, out of frame pipe, and more dyno runs that I've probably done.

Ask him who built the motor. I'd say its impossible on 50/50 race and pump gas. The pro-circuit pipe is another item that would make it impossible.

[rsss396]

Originally posted by machwon
I new of one 310 that put down those kind of numbers, new piston every day at the dunes. It was on alky, out of frame pipe, and more dyno runs that I've probably done.

Ask him who built the motor. I'd say its impossible on 50/50 race and pump gas. The pro-circuit pipe is another item that would make it impossible.

ya but that bike flew for a 310 - 4.2's at planet sand in gilbert

but heard that motor was never the same after it blew up.

franks in the red shirt
http://i870.photobucket.com/albums/ab265/rsss396/franks78hp310-1.jpg

http://i870.photobucket.com/albums/ab265/rsss396/franks78hp310.jpg

http://i870.photobucket.com/albums/ab265/rsss396/franks78hp310-2.jpg

[atv fan 28]

Originally posted by rsss396
ya but that bike flew for a 310 - 4.2's at planet sand in gilbert

but heard that motor was never the same after it blew up.

franks in the red shirt
http://i870.photobucket.com/albums/ab265/rsss396/franks78hp310-1.jpg

http://i870.photobucket.com/albums/ab265/rsss396/franks78hp310.jpg

http://i870.photobucket.com/albums/ab265/rsss396/franks78hp310-2.jpg

Just curious. What was the actual displacement on that 310?

[jcs003]

we need to see some dyno sheets.

[morse250r]

franks motor was a runner for sure
i spent years watching that little motor chase big shees down at the track and dunes

heres on anchor bay

On Methanol yes, I can attest to 310R’s putting out +70HP…

+72 HP would take a little work, yet quickly achievable, however; not on gasoline based fuels…

Depending on the Methanol combination, you would expect (as stated) to go through pistons, and possibly heads after every days runs…

Carlos.