Maintenance & Technical > KX500 Original

dyno charts and pipes

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doordie:
demographic !!
Okey here is some more "secret" info. :)
Reshaped (a copy of a kx80 aircooled 1980 modell ,with offset sparkplug).
Tighten squish-clerance to 1,3mm(avoids detonation) and another squish-angle then standard,another squishband, +5%hp in midrange and no detonation at long straights.
You can?t put two gasket and guess,you have to measure compression ratio and the squishclearance. :wink:
Yes,carbonfibre reeds,sorry. :oops:
The KIPS is under construktion,more info later.
No welded crank,think this is not a problem ,but i will considered it.
Crankholes filled to raise crankcasevolume and this allow shorter transferporttimes.
I WANT programmable ignition,but too expensive.:(
When you "play" with the standard ignition, don`t overadvance it,you can ruin the engine in a second. :cry:

demographic:
All good stuff :D

I don't think I will go the whole hog but some of those mods might be on the cards.

I am glad to hear any info on tuning KXs cos even if I don't do it now I might eventually do it :D

delusionised:
i just added v-force reeds and an fmf fatty in one shot, now i am scared in the tight stuff. Wide open, my eyes bleed. I love this bike

gowen:

--- Quote from: demographic ---Hey Doordie,

What modifications have you done to your bike to get that kind of power?
--- End quote ---


I'll second that..

gowen:

--- Quote from: doordie ---demographic!

I will tell you some mods ,but this is a special bike for only one thing, to produce much HP at high speed on ice,it will not suit for mx or trail.

Ported to very high portimes.(Roadrace-duration).
Iron sleevecylinder.(Easier to adjust ports).
Reshaped head.
Ovalbored carb.
KN-filter.
Reshaped reed with coalfibreflaps.
Modified Kips.(Diffrent springpreload).
Modified exhaustport.
SKF C3 bearings(For high rpm).
P.C desert pipe/SPES pipe or shorten standard pipe.
Trued crank (Filled holes).
Ignition retarded.
Lighter flywheel.
This is the most of the mods  :)
--- End quote ---


Considering, I ride 95% in the top-end, I think I'd like to try a few of these modifications. Doordie, what did you use to lighten the flywheel?

I was thinking, I have an old '89 kx125 that is rusted and dead laying in my trash pile of bikes in the back, I decided to open the flywheel cover and remove the flywheel/stator/pulser/cdi/ignition. The kx125 flywheel is maybe a third the wieght of the kx500 flywheel, is this too extreme? I know I would need to use the pulser/stator/plate/cdi to the kx and maybe purchase an electronic ignition to advance/retard the timing to suit the k5. Just curious if this would kill all power to the kx500?

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