Maintenance & Technical > KX500 Original

Which is the fastest bike stock older or newer kx500 or cr500

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chrisorbics:
Hi I have heard so many different opinions on which 500 two strokes are the fastest. I have heard that the old cr500 are faster than the newer cr500s. I know that the 1986 has the power valve and the last ones that honda made did not have a power valve for some reason. Where they trying to mellow the bike down. Does the same thing apply to the kx500s. Do the older ones have more power than the 2004 models. I have a 1986 kx500 and I know it is fast as hell and can blow anything away but I have never had it matched up with another 500 two stroke bike. Most people are too scared of a bike this powerful.

Does anybody know which one is the fastest. I also heard the hondas had better torqe off of the very bottom end. Give me your opinions and some facts. I was thinking that maybee the old bike are faster than the newer ones because people started getting hurt. I know that is why honda, suzuki, and kawasaki stopped making their 250 two stroke quads. They started getting in legal trouble because these "vehicles where too fast for the public."

Chris

Mick:
 :evil:
What a dubious topic for a KX500 forum...muahahaha

The older CR's were faster than the late models.  I don't beleive that is true of the KX.  As far as the late model's go a CR made 56 hp at 5800 rpm while the KX made the same thing at 6500. (credit to Dirt Bike magazine)
I ride a CR500AF.  V-force reeds, the PC exhaust, it's got a 39mm carb, a balanced crank and bla bla bla...My Dad also rides an '89 KX500 that he's had for over ten years.  With much the same motor mods and a few more still.
Near as we can tell they're the same.  As far as seat of the pants A-B-A tests go they're equal.  Even dragging the two repeatedly, swapping riders between runs, the two are neck and neck.  My CR does cross the line first every time, but it's not even by a bike length.  And we all know if we had another 15 meters to run the KX would nose ahead.
It is just a feeling, but it's our opinion the KX makes more power.  Every time it fires it seems to lunge ahead harder then my CR.  Like it's generating 10 more foot pounds of torque at the crank.  But the thing is my CR just builds power sooner.  It revs free'er.  Like it's not held back by anything.  Twist the throttle and it explodes into orbit.
Easy to understand I think.  The CR has a shorter stroke and no power valve.  Stands the reason to me it builds power sooner.  The two seem so much alike and yet they acheive the same thing in two different ways.  Smooth and torquey or quick and revy.

stewart:
in my opinion  the kx is faster (  i HAVE BEEN DRAG RACING my x 500 s  AGIANST  many other cr 500 s since the mid 80s  and have owend my own cr 500s )  and i feel the kx moter makes more power  and it has more potential for incress than the cr 500 for hp  (   after the last 3 or 4  hundred dyno tests )

Mick:
If we make this a "potential for power" topic.  I don't think it's a matter of opinion.  The KX motor is capable of producing alot more then the CR.  But I think the two with relative equal build are the same.

Hillclimb#42:
 Of course the kx has more power!!!!! I think taming it is the difference. The Honda has no power valve and shorter stroke. Why would they make stroker kits if that wasn't more power? Kx can pull taller gear and the same gearing farther between shifts than honda. The trick is to control the power, gearing, tire pressure and other variables and ultimately get the hook-up on the ground and not tear off the nobbs spinning. They slowed the Honda down, I believe to make it more rideable. Rideable is faster in a drag race at times, but doesn't everyone need some extra power that is a little radical now and then?
     "Green-Blooded"

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