Maintenance & Technical > KX500 Original

dyno charts and pipes

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kawdude:
Is it normal for all KX5's to begin to fall off the peak power at 7K rpm.  Is this the slow reving aspect of the 500cc motor?

delusionised:
normal for the stocker, check out the dyno graph.

doordie:
delusionised!

Yeah it?s some kind of brutal!
first gear: wrapp  8)
second: OO-Yeah  :o
third: what the F... :shock:
fourth: Mama plz help me  :twisted:
fifth: oneway ticket too the moon  :D

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  :)

demographic:

--- 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 ---


Thanks for that.

Mine gets used on the road as it's in Supermoto trim at the moment so some of those mods might be worth knowing about.

I notice you say the head has been re-shaped, did you lower compression to provide more over-rev? as I have heard of people putting two head gaskets in to do this.

I assume that coalfibreflaps means carbon fibre reads?

When you say different spring preload for the KIPS did you add or remove washers to do this?

Perhaps used a different method?

Holes filled in crank, Did you also get the crank welded as I have seen an article in a dirtbike mag that sugested doing this to stop the crank slipping out of true (the article was about 91 KX 125s though)

I might just have a bit of a play about with the ignition also.

You have got me thinking now :D

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