Maintenance & Technical > KX500 Original

FCR Carb on KX500?

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IridiumRed:
Hey Guys

Love the site.  I recently bought a 97 KX500 (due in no small part to what i read here!!)

question - I've got a Keihin FCR41 (41 mm flatslide race carb..... basically as nice as carbs get!!).  I bought it to use on my KLX650 dual purpose bike, but now i'm wondering, could I use this on the KX500?

I know i'd have to screw with the jetting, but i wonder if it would help with some of the jetting issues that the KX500 is known for??  It has a large (but somewhat adjustable) accelerator pump built in.....

I'm new to 2strokes (know a bit about 4 strokes), and I know that the FCR's are LOVED on 4strokes, but never heard of someone using one on ANY 2 stroke............

Of course, the 41 might be too big, but I could always get a 37 or 39.... they're way easier to find anyways

thanks!!

Timbowe:
Not sure bout the 500 but I know those carbs are the bees knees on my Duc S/L. Years ago some of the boys used to put 2 stroke carbs on some of the big bore 4 strokes. Was a popular mod. I'm sure some one here will have the answer for you. Cant wait to find out myself!

gowen:
I am unsure about the exact carb you speak of, but I have a carb for my 500 that is a 41mm Kehin PWK. Something like that would be better posted on Dirtrider.net for the guru Rich Rohrich to answere.

KXcam22:
IR,
  Might be fun to try.  I suspect you will have to disable the accelerator pump. 2-strokes typically don't need them. Have fun. Cam.

IridiumRed:
yeah, the accelerator pump could be disconnected, that actually probably wouldn't be too hard.....

i really dont know if an FCR would work on a 2 stroke, but I know with 4 strokes, the FCR is king of the hill.  There are flatslides similar to the PWK (hell, maybe varieties of the PWK will work on a 4 stroke too), but the FCR performs a lot better.

The PWK just looks like a dated design to me (and thats only my opinion and i could be way off).  The FCR has a slide that is supported on rollers for very low friction, for example - but of course, thats so that the slide isn't really hard to open due to engine vacuum, but.... maybe thats just not as big of a deal with a 2stroke.....

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