Maintenance & Technical > KX500 Original

Power delivery of KX verses CR

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KXFARMBOY:
With the KX having a "square" bore and stroke,and the CR 500 having a much more "oversquare" bore does the KX feel a lot stronger than a CR at low rpm's? Also is peak power about the same? Naturally we're talking stock against stock, or piped verses piped.

stewart:
two stoke theory i have read says  two strokes run best sqaure like same stroke as bore size i think the k 5 is right on

apple:
I had an 89 CR500, and a buddy had an 87 CR500. I heard that they toned the motors down since the 80`s.
I know mine had a powerband like a 250 and if you weren`t on top of it while on the gas the bike would toss you if you didn`t pay serious attention. My buddy`s 87 was even sicker. That thing made my knuckles hurt from the pulling that thing did, talking about stretched knuckles. Plus those things had lots of headshake. The KX is tons better on the low end, plus top end seems pretty close to the 89 I had.

gowen:
I've been looking for a mid 86-'87 CR500 for that very reason. I've ridden one and loved it.

Mick:
The KX does make a hair more power right off the bottom and on top.  But having rebuilt both of mine now I was surprised how much lighter the CR's crank and flywheel are.  The old CR feels a good deal more nimble at any speed then does the KX.
And also the CR isn't as pipey as KX riders would like to believe.  True the KX is the king of broad power, but the CR is the only bike that can run beside it.

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