KX Riders
Maintenance & Technical => KX500 Original => Topic started by: Delusion65 on June 20, 2003, 11:29:11 PM
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i am so frustrated trying to find dyno charts for KX500's on the web, i am trying to compare the different curves of pipes to find which one suites my needs, can anyone help me to find anything on the web as far as dyno's even a stock dyno would be nice, any help is greatley appreciated
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Yes, if anyone has got a dynchart, scan it in and publish it her on the site. It would be nice to be able to compare what different mods actually does to the bike... Unfortunatly I do not have a dynochart for my bike - yet.
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Hmmmm.... a powercurve would be nice.
I have two pipes (FMF Gnarly and FMF Fatty). One is for the track (Gnarly) and one is for everywhere else. The Fatty is just about the best all around pipe I've ever run - smooth power delivery, more bottom than the stock pipe, smooths the hit alittle, has a stronger mid than the stock BUT not as much topend power. The Gnarly is a beast on the bottom and into the midrange with less hit than the stocker and not as much topend BUT with the most bottom end I've seen in just a pipe change.
I have no experience with the ProCircuit pipes but have heard basicly the same thing as above about the PC MX and Desert.
MX = Gnarly
Desert = Fatty
Hope that can help you some but those dynocharts would be nice to see the effect of the pipes / modifications on the power curve / delivery.
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Well although it's not complete for reasons discussed in the thread.
There is a dyno graph here
http://www.visordown.com/forums/showthread.php?s=&threadid=114281
This bike isn't mine by the way, it belongs to another bloke off Visordown
seems pretty fit though :)
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hey!!!
Here is my kx500 -92 "wild" dyno rearwheel!!!! :twisted:
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Im not seeing it,Im sure Paul can help.
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The problem is that most browsers don't display tiff images. Try again with a gif, jpg, or png image.
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Hi again!!!
Will try new format (png).
Hope it will be better 8=)
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Can anyone see the dynorun now?
Observe the power is in kWatt= 1.36 times kWatt=HP on rearwheel.
The torque is in Nm, don`t now how to translate to Ibs.
(Sorry about my english)
//doordie
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D@mn 70.448HP at the rear wheel, good stuff :twisted:
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Hehe!!!
We can in sweden too, you now 8=)
But the bike is for iceracing, so it`s a bit peeky for motoX!!!
Got my second for that,haha not so impressive but it barks too.
Have now order a deltaforce too,see what it can do.
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where do you guys see the power curve? is there a link im not seeing?
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Never mind i see it now
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70 horse must be brutal!!
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Hey Doordie,
What modifications have you done to your bike to get that kind of power?
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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?
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normal for the stocker, check out the dyno graph.
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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
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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 :)
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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
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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:
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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
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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
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Hey Doordie,
What modifications have you done to your bike to get that kind of power?
I'll second that..
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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?
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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.
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Who sells PVL ignitions? I've honestly never heard of them. But sounds like a plan.
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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.
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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.
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Try this...
http://www.pentonimports.com
The link above includes the ".If" in the URL... :P
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Sorry Gowen! :oops:
Didn?t see your question.
I have milled the flywheel,but don?t remember how much.
I will post the answer later when I measured it.
You have to mill a new cone with the 125cc flywheel and you reduce the strenght by doing that.Calculate,and it maybe is "no problem".
It?s a winner for high rpm-racing.
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Hmm. I am still considering trying the kx125 ignition. But, I did call about the PVL ignition and they only sell the entire ignition system which runs from them at $501. Not too bad, but here is what I'm worried about, I read that doordie has used special high RPM bearings? Should I think about that before changing the flywheel? I'm a bit worried! I wil try the KX deal and let you guys know, if it does not work, I will give PVL a shot. I will also check to see if one pops up on ebay or something like that!
Thanks
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I'd like to know what a high rpm bearing is. I bet its one with a looser fit.
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I not sure your crank is trued/balanced,but if your going WFO a lot I'd suggest it.
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Good eye Kawadude,how'd that ".if" get included?
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Mike, the only wfo runs I do is in woods/trails so it is no more than wfo for more than 20 seconds at the most. Usally sprints from a to b fast. I ride mostly woods but occasionally drag strips which I run 5th wot for less than a minute at most. So, if still recommended, I will do that, but I hate to crack that case when I just had the bearings replaced.. :-(
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Make sure that all top end is what you want if you get the PVL,because your 500 will scream more than a 125 with it!