Maintenance & Technical > KX500 Original
kx500 outlaw kart motor
funkj:
After a discussion with owner/driver, mutual friend/driver and a few others the discovery was 6000 rpm and under simply don't come into play after the start. They clutch/slip for a big hit of the start maintain 8600 rpm we with little rpm drop off the corners. Not one of them thought that the kips would play a factor.like anything else if not used doesn't make sense to maintain moving parts. in the end the owner wants the kips gone
That being said , here are a few questions.
1. It's a given with a raised cylinder exhaust and transfer port floorss will be well above piston at bdc. Not having the motor in front of me limits my fact finding mission.the obvious question is raising the exhaust floor and the transfer for duration.
2.with the kips removed, the resonance chamber will be open , it will have an effect on top end how much I have no clue. What's the best option if the chamber needs blocked?
Thanks guys..
sandblaster:
If it were me I would do one of two things.
1. Lock the valves in the wide open position.
If you remove the valves you are leaving the resonators open and also creating turbulence.
2. If you want the most power, remove the the center flapper and replace it with a one piece machined part and reshape the exhaust port more like what you see in a CR500.
Use the drum valves and lock them wide open.
1901306708:
its pretty easy to lock em open. just make a little gizmo that will hold the rod out all the way. then its temporary, you can lock it open and test, and put it back
mine is hooked up to a dyno now. one of the things on the list to test is locking the kips open vs having them operate.
not sure i would run it long at 8600. may work for awhile until it unravels. the stockers also dont make much power up that high.
funkj:
--- Quote from: 1901306708 on June 09, 2018, 03:19:03 PM ---
not sure i would run it long at 8600. may work for awhile until it unravels. the stockers also dont make much power up that high.
--- End quote ---
Idk but George Becker of Becker motors and qrc karts literally invented outlaw karts in the 80's and been keeping them together at mid 8000 rpms for years. Zimmerman of Straight up performance is probably the most conservative builder in the business and I know for a fact he will tell you to gear for 8400-8600 with his pipe/ motor combo. Every builder out there advertising 90-100 hp on gas nobody going to convince me their doing them numbers at 6000-6800 or at conservative port timing. Kart motors period are high maintenance about 4 nights on a piston and six is pushing your luck. in my sprint shifter 80/125cc moto motors 3. Race days was tops on a piston.
Stockers area out of power under 7000 and there also in the back of the pack with not a prayer of being competitive . I picked this guy out to help because I believe his driving ability/experience is the only reason he is mid pack in a stocker and the fact he isn't an overweight 40 yr old.
funkj:
--- Quote from: sandblaster on June 09, 2018, 02:34:28 PM ---If it were me I would do one of two things.
1. Lock the valves in the wide open position.
If you remove the valves you are leaving the resonators open and also creating turbulence.
2. If you want the most power, remove the the center flapper and replace it with a one piece machined part and reshape the exhaust port more like what you see in a CR500.
Use the drum valves and lock them wide open.
--- End quote ---
That's pretty much where I was headed, seems like the most simple solution..
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