alcohol carb mods

[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

[JBKX]

I USED A 98 KX250 BOOT.  IT WAS TIGHT BUT HASN'T CAUSED ANY PROBS.  FTZ MIGHT HAVE SOMETHING FOR YOU!

[1alldave]

JBKX- Thanks for the input. I think I solved the problem. I have a Rad valve on the KX, It was sloppy with the Mikuni. Just happened to have another Rad valve for a CR500(would not work when I went to the Service Honda AF bike), tried the boot from it and it fits like a glove since the CR500 comes with a 38mm carb. I have been considering going to the V-force so I may try your KX250 intake. Should have the alcohol carb by New Years weekend, I will let you know how it goes. Thanks for your help.

[YUNGGUNNAZ]

Dave have you tried the lectron.maybe a 40mm.metering rod change and fuel inlet valve should do it.also tried a mossbarger reed cage w/spacer and and did better than v force.but thats just my 1 cents.

[doordie]

YOUNGGUNNAZ!

Mossberger reedcage with spacer works better then V-force,plz tell more about that combo...!

[YUNGGUNNAZ]

doordie,I,ve used the mossbarger cage on yz490,cr500 and the kx500 with success.we dirt drag 300' and 400' tracks.using the spacer put cage back some to allow for better vaccum as well as intake charge entering at a downward angle.there is a co. on ebay thats selling a cage that looks alot like the mossbarger and they have flow # saying they flow more than most.i have also seen the v force pedals break often.not good at about 65.00 a pop.if you stay with stock cage angle the top of each window for velocity and try a set of TDR reeds.mossbarger #800-891-1615.again just my 1 cents worth.

[doordie]

Hello yunggunnaz!
I think the mossberger spacer is the same as the moosespacer everybody talking about in this forum, a 10mm thick aluminiumplate?
I were at mossberger website,good flowrate for the reedcage compered to FMF and others.
But they say not about the V-force?
What do you mean about "stock cage angle the top of each window for velocity" didn?t follow you there.
I use TDR reeds for a long time now and it?s works well.
But do you not loose gasresponse with a spacer(lowering crankcase pressure)?
But on the other hand, you eliminate flowdisturbence for the boostport at the intake.
I will try it.
You gain proberly lowtorque.