Maintenance & Technical > KX500 Original

kx500 outlaw kart motor

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funkj:
first off; Great site, lots of really good solid info, hats off to those that provide it. Thanks so much. Thanks

I'm a long time kart racing dad, years of building  and racing two strokes on the national level. mostly IME 100cc, KT-100 cc yamaha, Cr-125's and a host of 200cc Yamaha motors for fun.

Recently, I've been "volunteered" to help a struggling 500cc  outlaw kart racer of a mutual good friend. I The only one in class running a bone stock kx-500 with a Sup pipe and a mid pack racer who I'm guessing is just outclassed by better prepped motors.

Un familiar with the kx-500 other than my week of lurking/reading self educating.ive never been a fan even in kartting for an all out top end motor and always been a fan of a motor with good mid range/ upper power. So saying that I think I have talked myself out of elimination of the power valve presently the stock motor has a good mid range/upper pipe by straight up performance.

My thoughts at this point right or wrong and certainly acceptable and open to to advice and critical opinion.


1. Raise cylinder to zero deck or deck to zero.
2. Like to shoot for 194 ex duration.
3. Clean widen transfers, possibly raise but like to keep a reasonable blow down number
4. remove exhaust sub port wall.( Not sure what to do with compression bump)
5. Clean / widen exhaust port.( Stay with 75% ish of bore possibly)
6. Open exhaust floor back up from raising cylinder.
7. Make modifications/clean power valves.
8. Raise booste port
9. Clean/port intake
10. Modify intake for v-force Reed cage.
11. port / clean transfer main/aux.
12. Cut head for :
        A. 1.3 to 1.5 squish clearance.
        B. 5 degree squish angle
        C. 35cc chamber installed.

Note: I've heard of several national guys running kx500 with out power valves but I'm not wanting to put this guy in a balls out top end motor with a bunch of piston maintenance.id like to shoot for so.ething in the 8600 rpm power range.

Flame away guys..

           

billb:
He should be beheaded for removing it from the bike!

funkj:
Oh boy, and I thought Ford blue loyalist were bad. :|

umberto:
I think your project sounds fun.  I love it when people think outside the box with our favorite big two stroke.  We have a few guys on the site that are very well versed in modifying the 500.  Some of them don't get on very often, so it make take them a few days to comment.  Be patient though; there is a lot of knowledge on this site.

funkj:
Umberto, thanks for the support.

Yea, this guy is in a field dominated by Honda CR-500's. Im not particulary brand loyal between Honda/Kaw but Ilike you I'm encouraged to help the guy outside the box. I'd like to see this guy in the front row, so I'm gonna give it my best, and a kinda of pay it forward effort to help out a racer.

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