KX Riders
Maintenance & Technical => KX500 Original => Topic started by: stewart on January 29, 2007, 12:34:26 PM
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hello all i am new here i have three kx 500 bikes a 2000 a 2001 and a 2003 i have also 2 spare engines i have been buying riding and modifying big bore kx s since i had my kx 420 in the 80s i have had several other kxs since any way i had post my dyno sheets on everything 2 stroke to get help making more power i have made 77 rear wheel horse on land and sea dyno and 61 foot pounds of tq at 500cc with vp u2 fuel 44 lectron max power cyl i ported and raised .050 v force reeds pro circut 2 pipe and sil encer 15.1 to 1 comp 2 drgrees atiming adv about 200 dyno pulls any input would be helpful
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Can you post up the dyno results (once you hit 10 posts) or just e-mail them to myself.. Nice results.
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Welcome to the site. Three 500's you are so lucky.
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thanks for welcome i would love to post dyno sheets there posted on the kx 500 thread on everything two stroke i was looking for ides of what to try for more power
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Hello Steward,nice to have you on board,we will talk about making horsepower to KX500 if you want.
I have seen your dynos and I?m very impressed for sure!
I put them on here if it?s okay for you,just say the words.... :evil:
I want to know what needles you use in Lectron 44mm for standard gasoline up to 103 oktan,not with blended alcohol that you maybe use also. :|
I got one and I will start test with Lectron as soon as possible and must have some guidelines if you want to share? :wink:
You talked about only 2 degrees advance,very little for sure,at what rpm do you measure it and do you use stroboskop or not?
Many questions here! :-D
To be continued.....
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please post them if you can
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Oki,but you have to answer my questions! :-D
I think this is the ones... :evil:
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i started at 60 horse rear wheel with stock comprsio and timing and 110 race fuel fmf fatty pipe and v force reeds i at 77 hp at 7000 rpm and 61 ft of tq at 6000 with lectron 44 and 15 to 1 made more power on oxgenated gas like vp u2 and vp cmp and raised jug .050 pro cicut pipe etc i have lots of parts i tried left overpipes etc do you want more detail just let me know we have made hundreds of pulls trying 1 thing at a time
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stewart,see you made it over.okay lets get'er going.did you try the rad valve against the v force?also when altering exhaust port timing did you massaged the center flap so in wide open position it was even with your new port roof.do i see chart right in that squish is .025.lastly have you tried a jemco down pipe for the kx500,which should put 1000-1500 more rpms on graph.my 2 cents
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i found the best power from the v force reeds was 2 horse better than boysen or stock i did not test the rad valve yet becuse i was so happy with v force yes i cut the top kips valve flap about till flush with top of exh however i am not sure it helped at this time i run 0 deck on piston to top of jug a .010 gasket and .038 depth in cyl head for a .048 squish i have a nice head cuting fixture we built and i turn the squish angle to .4 degrees about 2 more than the top of wiesco piston i had max power coat bore and piston i like them top coating the piston like the cylinder wall looks like ceramic chrome . i am running a 35 cc cyl head volume right now stock is 42 cc i have tried down to 29 cc
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the second two charts are old stuff before lectron44 and raised jug .050 the first chart was done in 98 degree temp but i have a lot of other charts about 100
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were in the same ball park as far as squish.mine being .043.but have not changed angle yet.deck is also 0.tried some reed cages but rad valve worked better for my setup in drag 500ft.the pipe gives me lots of top end but a little loss in the bottom.hence another pipe is on order from shearer this time.you did also work on the auxillary exhaust ports a little too.some gain should be there also.another member here was looking into use of custom 90mm or 91mm pistons as well.over here going 3mil stroker seems to be most builders approach.i'm not sold on this yet in single cylinder drag race setup.piston speed and angle,rod ratios i'm still looking into.gonna try a 48 lectron and 87 cylinder on next build.
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i only run 86 bore and 86 stroke which is stock what is your head ccs we need to recut head angles
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Oki,here we go Steward!
Is this right?
Raised cylinder:0,05 = (1,25mm)
Squish:0,048 + 0,01 = 0,058 (1,20mm + 0,25mm=1,45mm)
Squishangle:4*(degrees)
Headgasket:0,010 = (0,25mm)
Headvolume:35cc
Compression:15:1 fourstroke (8,15:1 twostroke)
Carb:Lectron 44 (needle??)(powerjet??) :?
Fuel:VpU2(oxygenated)
Inlet:Vforce 1,2,3??
Exhaust:PC 2
Do you have a portmap or can you fill in this one posted?
Exhaustduration?
Subexhaustduration?
Transferduration?
Boostduration?
Tuning are so fun!!! :evil:
(We have the same set-up,only carb is different! :-D)
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first i had the base gasket made out of .060 matrial that is how i raised the jug .050 over stock it is 0 deck at tdc .010 gasket .038 step in head total squish .048. i run v force 2 reeds changed when the flow is not equal on each section of reed block by holding up and filling with water and timing till each section is dry 130 transfer durtion 200 exh durtion to top
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Steward,can you fill in missing value on headmap,can?t figured out how you mean in your explenation,maybe I?m stupid,just from Sweden! :-D
I understand your squishangle(4*) and squishclearance( 0,058)but not how wide of bore? :?
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i am currently running a xl 4.2 lectron needle at a length of 2.025 on cmp fuel made by vp with 40 to one mix of 927 maxima oil my total squish is .048 thousanths not .058 my dome cc by its self is 35 cc
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Thx Steward for your reply! 8-)
I will make a "techinfo" later about barell/cylinderhead in my gallery and want some inputs from all of you. :-D
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today i found my 2001 runs better with xl 4.2 needle at 2.005 long and v p cmp fuel with 50. to 1 h1r bellray oil with b10 plug also put 5.4 spring on back for better transfer of weight on accelartion than the 6.0 spring
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stu,those things about the piston at bdc and 1.5mm on intake got me 6 hp more.call you tomorrow.
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???? :-D :-D :-D???? BDC /1.5mm????
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good reading back when this thread started i had 2 spare engines i bought 4 in the last 2 weeks have to count them now im guessig 25