Maintenance & Technical > KX450F / KX250F
KX450F vs. KX500
kayx250:
theoritically my 450 tops out at 83 in 4th and 95 in 5th gear and since you abviously called me out I'll just have to get a vid since im going to pismo this 4th of july
and I doubt 15+ 250 riders were squids
trust me on this I have both I even had my 250 bored and ported with 54 rwhp I think the 450 would still take it at pismo becuase of its gearing
KXcam22:
I haven't ridden many 250 2t that had a top end that made me sit up and take notice. The KX500 makes me take notice and my new 450 4t also does. It's deceptive but there is a lot of power there, and it gets to the ground quite easily. I love 2-strokes but I will not believe that a 250 2t can compete with a 450 4t in almost any venue. The HP and other physical advantages of the 4t are too great. In many of these "instances" that people describe, rider skill comes into play. I can't count the number of times I dusted off superior bikes in tight single track on my 92 K5. I told them it was all the bike - but it wasn't. When I look at the starting line of any MX or supercross even the lowest budget privateers are running 4t bikes and accepting the higher cost to be competetive. All I know is that on my 450 I can go really fast, really easily. Cam.
kiwimonster:
hey guys im going to throw my 2 cents in too , i race my 2000 k5 in mx here in nz in the vets class 35 + im the only guy riding a 2 stroke. all 450 fs the 4,s hook up way better than my big banger, i find it very frustrating in the corners they hook up and my big 5 just breaks loose. raced last sunday sitting 4th pushing for third cracked the gas on in a right hander, very wet , she step out left then right then left the ka pow im down. throttle control i dont have. can run the 4 strokes down on the straights but for hook up and cornering the 4,s have it. but hey i still love me big 2 banger :evil:.
dsrtrider:
I have a 1994 kx 500 and a 2007 ktm 300 xc-w. my 2 cents:
in mid 1990's apparently people thought 2 stroke 500's were to powerful so industry stopped making them. then we decided 250 two strokes didn't have enough power so rather than just making a 300(or something like that) 2 stroke we went in different direction and came out with a more powerful four stroke with all the complexities, cost, etc (with the help from the AMA rule book allowing for 450's in 250 class based on ????). Just becasue it was possible to get a 4 stroke lighter in weight and with good power the downside as stated in earlier posts makes me wondr if it was worth it. hindsight maybe industry should have kept with a 2 stroke and just used a higher displacement to keep all the advantges of a 2 stroke.
I remember old magazine tests that would say one bike was more torquier than another and sometimes they would score more or less. if we just needed more HP and torques you can get that with a 2 stroke with larger displacment, flywheels etc.
my point is in the debate on 2 stroke vs 4 stroke is that 2 strokes are better if you compare apples to apples. a 250 two stroke is down on horsepower and torque to a 450 which is why the AMA should revist its resaons behind its displacment limits and use something reasonable to we the consumers have a real choice. if we had 300 two strokes (or whatever the magic number is) that has the same horspower and torque the two stroke would be the better choice becasue it would always be lighter, easier to work on, cheaper, etc. 450 four stroke vs 450 two stroke, 250 four stroke vesus 250 two stoke are not fair comparisons so its not a 4 stroke vs two stroke debate. its the displacment debate between the 2. Dirt rider just did a 2 stroke vs 4 stroke test at the sand between 450 and 250 two stroke. how about a 500 2 stroke versus 450 four stroke. is either fair? consumers need real fair choices and let market decide.
Now we hear in some ametuer classes they will allow 250 two strokes race with 250 four strokes. is that fair? the 250 two strokes have the horsepower advantange so does that mean everyone will by 250 two strokes and the 250 four strokes will go away??? no our kids will go from mini's to 250 two strokes?? LOL seems AMA needs to get so realistic displacments. but probably to late.
one last rant: i keep hearing about EPA laws killing two strokes. where is the exact EPA law or is it just rumor?
kiwimonster:
this year in nz we are running 250 2,s against the 250 4,s in the national titles first was a 250 4 then 2nd 3rd 4th 5th were 2 stokes, it was a real eye opener as there were bugger all points in it, i think they won two rounds each, the 2,s on the nice loamy tracks and the 4,s when they were slippery. in my class the vets you can ride anything, im looking at getting a klx 450 as i like the e start side of it, but i will be keeping my k5.
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