250-500cc Keihin PWK swap and JD Jetting

Hey dudes,

Ive currently got a Mikuni TMX38, but its blowing plugs like no tomorrow and theres heaps of spooge seeping out. Im thinking of swapping it out for a Keihin PWK38 as others have done on this site, and looking at shipping the PWK38 A/S with JD from jdjetting.com.

1. Whats the difference/advantages between standard PWK38 and PWK38 with A/S ?
2. Should I get JD Jetting and how beneficial is it compared to the standard PWK jets/needle ?
3. Will i need a new throttle cable to fit it? (another expense...)

details:
husqvarna wr250 2001
located in sydney, australia
live at 225m elevation but often do trips at 1225m. temp generally ~68F /20 C
fmf powercore 2 silencer
fmf gnarly
twin air filter
motul 800 off-road (flashpoint 468F)
unleaded 98
50:1
spark plug: BR8EG
currently using mikuni tmx38 carburettor

I've searched through the site, but if my questions have already been answered please shoot me to the respective thread.

cheers, jason

I just traded my keihin pwk for a z start pro Rekluse. I didn't see much difference between the two. TMX better top end and the Keihin starts a little easier, and a tad less spooge. I went with the Lectron smoothed out the power delivery, normal spooge (just a little but not drueling or dripping) but I didn't really see any improvement in fuel economy. Still very happy with the Lectron.

Nice trade I gave up the the TMX, skipped the PWK and went for the Lectron. I'm still fine tuning, but already a huge improvement.
If you're set on the PWK, I think many ordered the carb from JD already jetted for their locale and were happy.

I have the same pipe, air filter, and spark plugs and I also run a 50:1 mix.

I live in the rocky mountains and have ridden my bike from 5000 - 10,000 ft (1500 - 3000 m) and a wide temperature range and my PWK is great with a little turn of the air screw and adjusting the idle screw.

I hope that helps.

dunno what style of riding you do Jase but i bought one bottle of the motul 800 years ago & havent bought one since. fouled plugs & spooged like a mofo! if youre WFO alot then it should be fine though. put an ad in classifieds section for a PWK. i recommend the lectron, i skipped the PWK altogether. PM Ausky on this site, hes in QLD & last time i was at his joint he had a box full of carbs of all sorts plus hes running a lectron too so he might be able to help you out? good fella & very knowledgable too. might be able to give you some jetting/tuning tips as he has owned an assortment of huskies(primarily 2T) in the past & present. just an idea mate. Rockdancer might be worth a try too mate.

the pwk is much better than the tmx. the pwk adds bottom end power and smooths the hit.Bike starts sooooooo much easier and never have to rejet. I have mine set at pj42 mj172 DEL in 3rd clip and AS@1 1/2 turns

100% with shawbagger on the Motul 800 , Ran two tanks of fuel useing it and gave up on it. Never fouled a plug but must of come close looking at the plug, Stuff smokes like a room full of junkies and dribbles more sludge than a blocked drain.

let me mix it up a bit.
when I bought my 2013 WR250 it would not get out of its own way. I read here about the pwk38as and ordered one at my LBS as I have a lot of jets for the Kehien (lots of 2T in my garage) a year later even bought the jd needles it was a spooge monster. I bought a bunch of Mikuni jets reinstalled the TMX spent one day jetting and the bike has never been better no more spooge and I just got first in class at Sundays NHHS.

thanks for the replies everyone! legends

i do ride WFO. do you recommend motorex? not sure how many other options are at my local store.
the lectrons look awfully expensive here in aus. cant see cheaper than ~$500 :/ altho ill trying pm'ing ausky, cheers

unfortunately my mikuni carby might need replacing. its now missing the top rubber seal, the slide needle retainer is broken, and i think the float needle seat thingy is a bit worn. it is 14 years old. and buying a new mikuni tmx turns out to be more expensive than a jd jetted keihin pwk ($400aud from the us).

you can have my tmx for a slab of piss & postage from WA if you want it mate? yeh motorex ok. i just use castrol tts from super cheap auto-cheap, full syn, blue for easy id, seems pretty good, easily available & doesnt smell too bad! lectron exy now(with AUS dollar up shit creek) but still worth it. keep an eye on the classifieds on this site, ya never know

Prices here for JD PWK and Lectron are about the same (didn't check current ex. rate) Here, Lectron and cable @ $425 US! But it is worth it if you can swing it.

I will sell my PWK for $200.00