Maintenance & Technical > KX500 Original
How to build an @ss whooping KX500
manco:
Continuning my brain storming list from above here are some more areas I am gonna look into.
15 Flat slide vs Round slide carbs
16 Softer reeds for more opening at low rpm
17 Lower vs higher compression
tecate3:
In ’84, Honda introduced a bike so vicious, it has gone down in the annuls of all-time ground-pounding terror machines. With a powerband that jumped from 20 horsepower to 50 in the course of 500 rpm and a shock unsuitable for a 125, controlling the explosive 500R required a delicate touch and nerves of steel.
manco:
True that about the early Hondas. I recently picked up an 81 Honda CR250r with blown motor. I am looking into swapping in a CR480r engine. From what I have read quite a few of the early big bores had two operating modes, blubbering or exploding which were separated by an 1/8" of throttle twist.
RoostiusMaximus:
better yet, i have a CR450 engine without a home. its a direct bolt in to the cr250 frame you have. you'd need your carb/reed/electrical for use on this engine.
RoostiusMaximus:
no to get too far into this without pointing out something obvious, the reed spacer is the best thing you can do to help what you're looking for. Or a VF2 reed. Ignition shouldn't be a big deal, run the old small flywheel stuff.
In the CR we were lucky, the 84-86 engine was a 139mm rod so the rod ratio made the engines response evil quick. 1984-85 also had the lightest flywheel and most degrees of timing compared to any other cr500.
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