250-500cc Kx 250 Carb Instead Of Tmx

I grow tired of my wr250 mikuni loading up with fuel on "ladies" rides yet run lean and hot riding normally, i ride from 3000 to 8000 and hard to find the right jetting (390, 30, stk needle 2nd groov.) so i figured id throw a keihin on it from a 2001 kx250, it has the powerjet and tps, both dissconnected now and plugged off, i mocked up the carb, its a little shorter (front to back) and the bowl just touches the cases... anyone do this before??? most use the "proper" pwk, but i had this one hanging around..

SORRY DAMN IPHONE SIDEWAYS PICS!

will work very well but the bowl touching the case is a no no as fuel frothing may happen and in my experience of this happening will result in seizure so try to juggle things around to gain a little clearence even if you have to make a spacer to go behind the reed block

Plus it will eventually wear a hole through the bowl due to the vibration rub.

a bit of aircon duct insulation (black stuff) would solve that problem
Robert-Jan

Is there an intake boot that is a little longer then stock? Perhaps off of a Honda cr250 or the like?

Also would the moose intake spacer for the cr250 Honda work?

Looks similar to the KTM carb I have for mine. It was a little short and touched the case too. Have you tried to put the tank on yet? Mine hit the fuel petcock too so I haven't got to try it yet. Just got a different acerbis petcock to try this spring.

I think they are the same carb, i didnt even try the tank yet, i was more worried about the head mounts, but that seems to clear fine. i think i will break in the new top end with the mikuni THEN figure out this keihin. Turns out i have to use the kawi throttle housing and cable too. i should just buy a new OSSA! haha

looks like the honda cr250 02-07 has the identical reed bolt pattern so a spacer kit from moose racing will fit,

Basically the same carb that comes on new KTM's, so get the clearance issues worked out and you will be good to go.

If you use the cable guide from the Mikuni on top of this carb the stock cable should work.

May we ask for you jetting?
Does it feel much better?

See Post #6. I haven't got to try it yet. I will this spring someday when the snow melts. It will be awhile till that happens here.

I think I'll try the CR intake spacer. It should help with the fit.

The keihin cable holder is riveted into the cap. So switching it isn't a good option.

built a spacer out of 3/16 6061 alu, got a new kx cable off of ebay for $1.50. now i just need a kx throttle tube and it will be a complete set up. everything clears wonderfully, and maybe ill gain a touch of tourqe down low. im going to start at middle clip position, 170 main, and 45 pilot a/s at 1.5 turns so it might be close....?

A lovely piece of fabrication work ! well done
A ktm throttle cable is a direct fit if a kx twist grip dosnt show up

Well I stole the throttle tube off my 79 z50. Which was a factory Yamaha from my 04 yz250. The grip feels the same as the husky's, so I'm set there. But then I find out the petcock hits the top of the carb (tps housing) so I've got a Clarke petcock ordered. Hopefully that will do the trick!

I've been running the PWM on my WR for the past year. The one I use is the Keihin generic version without the TPS and power jet. I also use a reed spacer from a GAS GAS, which is about 3/16" or less and button head bolts. The stock Husky cable adjuster screws right into the cap, so I can use the stock cable. It also just up just like the more common PWK that most convert to.

I didn't have the spacer in this picture.

Hows the PROVINI work and where the heck did u find 1 in America???$$$$$

It works great, I love them. This is my second one and Halls was able to get this one for me.

Everything is assembled, fits nicely, and for future reference for any of you the Clarke straight down "grooved" petcock fits perfect.