melkman

thanks thats exactly what i needed to know

tigmaster

I would seriously look at a 450f. You will regret anything less. I have both remember and I am very unsatisfied with the power my CRF450R gives me. Granted, I am nowhere near good enough to use all of its power at the track but there are times when I want more.

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aggiemoto99

I rode an f4i for a week...and no kidding, the power is intense...but to compare the street bike to dirt bike is just not feasible..

And a neat fact...my yz250 two stroke pulled my friends f4i all the way until it tapped out from a rolling start at like 5 miles an hour. Neither of us expected that after riding the f4i to 140mph....

with the super short gearing ratio dirtbikes have, they accelerate just as hard, but not for as long...if that makes sense.

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gscx

i dont really know of any dirtbikes that will accelerate to 60mph in 3 secs, which is what the average 600 can do today if there is a good rider on board. but i am talking about the supersport bikes like the gsxrs, and zxs. i dont doubt that a yz250 will accelerate just as hard as a F4i though

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Th3-di3ing-br33d

The Pro's dont even use all of there 450's power, actually some riders tone them down a bit.

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tjscott2012

yeah, like the 2008 kx450, it was tuned down a couple horses

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wr250f95

450's are insane machines, look in the cycle trader,
"low hours, risk of injury forces sale"

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this, is why I ride.

aggiemoto99

His bike is i believe an 02 or 03, the first year of fuel injection on the honda 600.

I garuntee it did, not just once, but on multiple pulls... Keep in mind rolling start, no clutching the 600 to get it in its power.

But I promise you would be amazed at the result if you grabbed a 600 and a 450 and did it.

If you can ride a that 600 zero to sixty in three seconds, I would be so amazed...I think his bike needed one shift to do it, although i may be wrong about that.

Id say most mortals can do it in 4, and like i said, rolling start no clutch...it is a dog until it gets on power.

My point wasn't to prove a 450 "faster" than a street bike, just to throw out there how fast dirt bikes really are in their intended speed range. With their SIGNIFICANTLY less weight, and that is everything with bikes...and extremely quick gearing, they are faster than snot to 60.

On the dirt....in an mx setting...they are plenty fast

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tigmaster

Ya, power to weight says a 450 should be just a bit faster yet we all know that isn't everything. My F4I tops out at 71MPH in 1st gear. I forget the math for my CRF450R. Probably like 30mph I believe. I did it once. I have an '06 with EFI of course (F4I vs. F4). It should however solidify the point that 450s are capable of pulling their gearing until the rev limiter. I actually watched a dirt bike race at the strip against a street bike. It lost but it was close. I also believe that gearing greatly helps out on the dirt bike in grabbing the holeshot. The F4I is a slow street bike compared to many, well 6hp less that a 600rr but still... However, it lacks power horribly down low. My girlfriend has a YZ300, I would enjoy that race. Anyway, some day I will get around to racing my bikes. Thanks for the info.

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gscx

yea 70 is about right in first gear, thats only 10 mph less than the 600 supersport bikes, but the gearing gets narrow after 3rd gear, the 1000s go about 100 in first, but only up to 190 with their remaining 5 gears, but, that probly einsteins(i think i spelled it wrong) E=mc2 formula has something to do with that also, not just the ratios

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