Author Topic: dyno charts and pipes  (Read 17613 times)

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kawdude

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dyno charts and pipes
« Reply #15 on: December 29, 2003, 05:10:39 AM »
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

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« Reply #16 on: December 29, 2003, 06:37:46 PM »
normal for the stocker, check out the dyno graph.

Offline doordie

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« Reply #17 on: December 30, 2003, 01:20:00 AM »
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
Iceroad champion 2006,still 2007,even 2008 without a single race!

Offline doordie

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« Reply #18 on: December 30, 2003, 04:24:28 AM »
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  :)
Iceroad champion 2006,still 2007,even 2008 without a single race!

Offline demographic

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« Reply #19 on: December 30, 2003, 08:28:41 AM »
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  :)


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

Offline doordie

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« Reply #20 on: December 31, 2003, 12:46:29 PM »
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:
Iceroad champion 2006,still 2007,even 2008 without a single race!

Offline demographic

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« Reply #21 on: January 03, 2004, 01:43:34 AM »
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

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« Reply #22 on: January 03, 2004, 05:13:20 PM »
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

Offline gowen

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« Reply #23 on: May 21, 2004, 05:40:34 PM »
Quote from: demographic
Hey Doordie,

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


I'll second that..

Offline gowen

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« Reply #24 on: May 26, 2004, 04:29:04 PM »
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  :)


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?

mikesmith

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dyno charts and pipes
« Reply #25 on: May 27, 2004, 07:01:57 AM »
If I remember right the aftermarket PVL ignition comes with a lighter flywheel and is made for top end, if you want to spend the money on it.

Offline gowen

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« Reply #26 on: May 27, 2004, 07:21:32 AM »
Who sells PVL ignitions? I've honestly never heard of them. But sounds like a plan.

mikesmith

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« Reply #27 on: May 27, 2004, 07:32:00 AM »
I never have checked it out my self because from what I hear a PVL is all top end (not what I want) but try www.pentonimports.com.If they dont have it they could tell you where to get one.I know a few years back a guy on the old KX web site had one he was trying to sell or trade for a stock KX ignition.

mikesmith

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« Reply #28 on: May 27, 2004, 07:37:18 AM »
Well I just tried the link and it didnt work,so  heres the info, Penton Imports Co. 1115 Milian Ave,Amherst Ohio 44001 or phone 440-988-4474 and the Fax:440-988-4476,hope that helps.

kawdude

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dyno charts and pipes
« Reply #29 on: May 27, 2004, 10:38:02 AM »
Try this...

http://www.pentonimports.com

The link above includes the ".If" in the URL... :P