Maintenance & Technical > KX500 Original

alcohol carb mods

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1alldave:
I am wondering if anyone out there has any experience setting up a KX500 for alcohol? I have a 99 KX500 I use for sand racing. It currently has a ported cyl. bored and plated to 88mm, bored PWK carb, Rad Valve, rev pipe, and as much compression as I was able to create. It barks hard, but I think alcohol is the next step

Paul:
The biggest mod for alcohol is the gaskets. The alki really dries them out so you'll need the special ones. My alki experience is with cars so I can't tell you where to look for the PWK ones  :?

JBKX:
Iwould get ahold of CT Racing, Eddie Sanders Racing or Trinity Racing.  They build drag quad motors.  I have a FTZ Racing Mikuni gas carb. on my KX500 motored Tecate 3 wheeler and it pulls long and hard!  Hope that helps.

1alldave:
You may be on track with the Mikuni carb. I am already running a 210 main jet at Dumont( 500ft above sea level), Keihen jets only go to 220. I think you have to come up with a way to increase float bowl capacity as well.

1alldave:
JBKX, Thanks for the input. I talked to a guy named Larry at FTZ, they offer a Mikuni set up for alcohol. I tried the same carb in a gas version just to see how it would mate wih the intake, throttle cable, and airboot. Only problem is with the intake boot. The Mikuni starts off as a 38mm, the stock PWK is 39.5 and the fit is sloppy in the intake boot. How did you get yours to fit tight?Thanks for the tip about FTZ, they seem like a good outfit

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