Anyone ever dyno test a 250?

[CR480R]

I rode along with a couple buddies last weekend to dyno test their 450's... Afterwards I asked the dyno operator about dyno testing my 3-wheeler and he seemed to think something I said was funny... He told me that 250 2-stroke atvs typically only pull low 30's for rwhp... If thats true I dont even want to let my buddies see my bike on a dyno....

[drag lt guy]

Whats done to the 3 wheeler? if its stock then 30 hp seems acturate, got the potential of some pretty high #'s. anywhere from stock 30hp all the way up to (in some cases) high 50's or low 60's.

[flotek]

a stock 250 based quad would probably struggle to break 30 rwhp on an accurate dynometer but a ported big bore alky 250 could hit 55-60+ rwhp though ... which a 450 four stroke would have a very hard time ever acheiving (and stil l hold together reliably anyways)

[fulltiltrider]

Originally Posted by CR480R

Afterwards I asked the dyno operator about dyno testing my 3-wheeler and he seemed to think something I said was funny...

I fuckin hate people like that. Some people have no clue.

[CR480R]

Originally Posted by drag lt guy

Whats done to the 3 wheeler?

The engine was originally a '91 KDX250... But I put the crank and cylinder from a '98 KX250 in it.. It has a KX500 v-force 2 reed cage and a 38pwk.. The head was cut to yeild .045 squish.. and I am using an fmf fatty pipe....

Originally Posted by fulltiltrider

I fuckin hate people like that. Some people have no clue.

his attitude pissed me off, but now I am curious... even though I just built it to be a daily rider.. I wanna see

[drag lt guy]

I would say you have close to 40hp.

[fastR of puppets]

Originally Posted by flotek

a stock 250 based quad would probably struggle to break 30 rwhp on an accurate dynometer but a ported big bore alky 250 could hit 55-60+ rwhp though ... which a 450 four stroke would have a very hard time ever acheiving (and stil l hold together reliably anyways)

not trying to start an argument here, but a bone stock ltr has 48hp, and with a dasa powercommander, dasa pipe, no airbox lid, a high comp piston, running race gas, makes about 55, and obviously it can be brought up much higher than that with some real motor work, and still not go over 450, i think Joe Byrds DASA 450rs were putting out something crazy like 70hp out of a 450cc motor, but those motors only would last one race

[CR480R]

Originally Posted by drag lt guy

I would say you have close to 40hp.

Thats about what I was thinkin/hopin for... the my buddies 450's have mods and they pulled 45 and 50 hp on this dyno

[fulltiltrider]

Originally Posted by fastR of puppets

not trying to start an argument here, but a bone stock ltr has 48hp, and with a dasa powercommander, dasa pipe, no airbox lid, a high comp piston, running race gas, makes about 55, and obviously it can be brought up much higher than that with some real motor work, and still not go over 450, i think Joe Byrds DASA 450rs were putting out something crazy like 70hp out of a 450cc motor, but those motors only would last one race

Read your last statement. Denny is talking about wheel hp not crank. How much did all that shit cost for that 4 poke. Plus you forgot cams, valves, valve springs.........2 grand plus per rebuild, fuck that.

[quadzilla87]

its just hard to beat a bigbore 4 stroke
with a 250