Posts
11
Joined
1/14/2020
Location
AU
steve7
1/22/2020 6:16pm
1/22/2020 6:16pm
I thought I would post this to help any one struggling to getting the jetting right on there KTM 250. I swapped out the original Mikuni out of frustration and went to a Keihin PWK 38 because I consider this carb better suited to the bike. I bought a JD jetting kit , which in hindsight was probably caused more confusion. With JD jetting in, the bike had a pipebang / de acceleration chug making it unsettled into corners and spooge like no other. I was committed to get to the bottom of this and set about learning more on this forum and many others. After reading and trying to consume as much info as I can I came up with the following: JD jetting red needle on 2 nd clip ( will be swapped out for N3CH needle when it arrives), 38 pilot,165 main, a/s at 3 turns out. The bike revs free, no pipebang and no spooge. I ride at 0-3000ft in Queensland
, Australia. Not a believer in JD jetting anymore or their advice given when contacted. I hope this helps someone chasing the right settings for this bike and carb setup.
Cheers
, Australia. Not a believer in JD jetting anymore or their advice given when contacted. I hope this helps someone chasing the right settings for this bike and carb setup.
Cheers
The Shop
I run pretty much the same jetting all year from high 30's (this needs a bigger pilot) to 100+ and almost never touch the carb. Every once in a while I'll check the air screw. I've run in low humidity and high without changing a thing. I've been in high humidity with fog in the morning to hot and dry in the afternoon and still didn't need a change.
From what I've been gathering people that are having problems still after changing to my jetting are only doing part of the changes. Like they will cut the slide, but run the main lean and the pilot rich and they say its ok. Or they will run the slide and the jetting, but not the needle and still have a problem. I've also had them run my full specs, but change the power valve and complain it doesn't pull right or how they want it to. Sometimes they will run the full specs. and try and run 32:1 premix with it. It all has to go together to work right. What really needs to happen is for someone else to ride my bike and then post up what their thoughts are on it. Sadly everyone that has ridden it they don't post here on vital lol.
I am in the same geographic area as you, just bought a keihin w/jd kit. Was going to ditch the JD needle and run NECJ needle, 175 main and 42 pilot to start on a 17 250sx.
What specs you running?
I will also say I run the Suzuki 17-62 needle in my mikuni and it seems to run much better than w/stock needles.
thx.
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