Maintenance & Technical > KX450F / KX250F
KX450F vs. KX500
kayx250:
--- Quote from: Good on May 01, 2008, 08:50:28 AM ---I'd like to ride a 450 just to see the difference.
Actually HOW different is the 450 from the 250 2stroke? Truly, does the 250 not compare powerwise?
I rode a 250 4 and it was weak.....
--- End quote ---
thats how I felt when I rode my first ever 4-stroke mx bike I was embarresed to tell the guy what I really thought and this was me coming off a 2001 kx125 thats had never been open even for a new piston!!...that thing was a turd...now I did ride a 07 kxf450 and it was a power house and like someone said I actually do believe my bike "could" technically win in a staigt out drag race(I actually put money on a drag race with him but he refused) on a track it would slaughter me but then again thats what they are designed for, winning races and thats it, not lasting 10 years on the same piston, or starting easier, and running cooler or what ever you guys are complaining about they are full out RACE BIKES
Kev:
Hi guys, For four pages everybody has been stating facts, not opinions, and kayx250 hit the nail on the head. The new 4t's (KXF, CRF-R, YZF, RM-Z) are full on race machines. Technology on par with F-1 racing. Does anybody here care to imagine what the maint and repair costs are on a Honda F-1 engine? I know a lot of you guys are around my age (45) and raced in the seventies. Do you remember doing top ends after every race on your 2 smokes? If you didn't you weren't competitive. I don't recall thinking how cheap it was. Relativity gentlemen. 4 strokes are here and here to stay and 2 strokes will soon only be in museums. I am not a 4t cheerleader, I prefer 2t, that is why I ride the KX5 and that is why I was just discussing the KX 250 with Don46. However only a fool thinks that 2t's are going to make a come back just because of their maintenance costs. The EPA couldn't care less about the maintenance costs on racing motorcycles and they d*mn sure don't care about our leisure time hobby. 2t's might well be available in the future, but we all know that it will not be for retail. You will have to be a race team or you won't touch one. It has been a good 4 page read and everybody has stated the obvious and some not so obvious facts. So now lets all go and buy what we can afford, get lots of dirt/sand in our teeth, ride em til they break, fix em and get more dirt/sand in our teeth before the Gov takes it all away from us. Keep em roostin boys!!! :-D :-D
Kev
kayx250:
well I officially can vouch for the little debate here....4-stroke for the win.
I have a 2003 kx250 with a 2005 kx250 engine swapped in and I just bought a 2008 kx450f and the 450 wins hands down it handles better, pulls harder, hooks up better, breaks faster, I can ride a wheelie in 5th for like a full mile now becuase I have so much more control of the power and the best part it it makes me feel way more confident riding on it the one and only complaint so far is it is EXTREMELY loud
Uzi9mm:
Fully indoctrinated. Drinkin the Kool-aid. :-o
KXcam22:
Still liking it! Now that I am more used to it I can use the advantages of the power delivery to go faster. It's a stable platform that inspires mega confidence. I can get one kick starts, hot or cold most times. I am used to kicking the KX500 so this thing is like kicking over a vespa scooter. Stalling is the only major issue and I am down to about 1 per hour of riding. In the same situations and terrain the KX500 would stall zero. Frustrating, since this type of flameout stall sometimes takes a dozen kicks to restart - then you have to catch up and re-pass. For really tight riding the KX is vastly superior - 4strokes just don't lug the same. My KX brakes were excellent so no real improvement there. The real place that I find it superior to the KX500 is comming out of corners. When the KX hits the powerband you get a fair bit of wheelspin (and excitement) just about the time you get to the acceleration bumps. This makes it diffficult to control while maintaining the acceleration (but it is also why we love 500's). The 450 power allows me to use more throttle in the corner so my exit speed is much, much higher and then the different power delivery makes the acceleration bumps kind of vanish. In a typical single track corner I can easily gain 10-20' on the exit on most people I am chasing. I am still not a convert but becoming a big fan. Cam.
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