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Old 12-02-2014, 09:15 AM   #1
gspadafore OP
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Another KTM 300 XC-W jetting question

So I'm an old guy with 40 years riding 2 smokers. I've had 10 different KTM 300's and I'm so confused. My buddy and I bought identical 2014 KTM 300 XC-W's. Love the bike, perfect for me and my riding style. After first ride, noticed it was a bit fat, so changed main jet from 168 to 165. That cleaned up the mid and the top, but I still get a burble just off idle to 1/4 throttle. I installed the leaner needle (K), clip 1 from top. Already has a 35 pilot, understand they don't make anything leaner. I've got the air screw 2 full turns out. Last week went to a 162 main jet. Again, mid to top, very clean, explosive power, but still burbled off idle to 1/4 throttle. I ride desert north of Phoenix, 2,000 feet, temps in the 60's. Oh, and my buddy went to a 165 main jet and his bike runs perfect.
Help!!
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Old 12-02-2014, 02:51 PM   #2
Gamequeazy
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Have you tried taking the silencer plug out after you washed it last?
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Old 12-02-2014, 02:51 PM   #3
Bump Stop
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Quote:
Originally Posted by gspadafore View Post
So I'm an old guy with 40 years riding 2 smokers. I've had 10 different KTM 300's and I'm so confused. My buddy and I bought identical 2014 KTM 300 XC-W's. Love the bike, perfect for me and my riding style. After first ride, noticed it was a bit fat, so changed main jet from 168 to 165. That cleaned up the mid and the top, but I still get a burble just off idle to 1/4 throttle. I installed the leaner needle (K), clip 1 from top. Already has a 35 pilot, understand they don't make anything leaner. I've got the air screw 2 full turns out. Last week went to a 162 main jet. Again, mid to top, very clean, explosive power, but still burbled off idle to 1/4 throttle. I ride desert north of Phoenix, 2,000 feet, temps in the 60's. Oh, and my buddy went to a 165 main jet and his bike runs perfect.
Help!!

honestly, I'd contact KTM and have them tell you what to do. What I would do if I were you is switch curbs with your buddy and see what happens.
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Old 12-02-2014, 06:39 PM   #4
renogeorge
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I have been at this 2 stroke jetting thing for a few years too.

Having had a few of the 300's myself I have found that the pilot to needle transition is the key. And I have always settled on 40, 42 or 45 pilots to smooth that transition. I know it seems to be going the wrong direction. My suggestion would be to try a 42 or 45 and adjust needle leaner by raising clip a position or 2. I run the N2zk needle with these pilots.

Lots more on KTM Talk if you want more opinions.

Good luck
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Old 12-03-2014, 08:56 AM   #5
wfopete
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Have you checked your float height?

Here is where you need to go:

http://ktmtalk.com/forumdisplay.php?f=10

and this place that deals with KTM jetting daily:

http://www.jdjetting.com/xcart/home.php


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Old 12-03-2014, 06:57 PM   #6
Chappyd
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I had a 300 a few years ago. I learned a lot about jetting, but could never seem to get it just right. Fast forward to a couple months ago- I picked up a 2008 250 XC. Was pretty rich off the bottom. So.. this time I tried something simpler. The needle was in the middle clip. I raised it all the way up (dropping the needle all the way in) and it cleaned it right up off the bottom. I rode it at an MX track, 70 deg day, and was worried that it might have gotten on the lean side at rpm, but that was not the case. I did raise the needle 1 groove, and rode it for a 60 mile turkey run, about 50 deg F outside. It ran perfect all day, no hesitation or stuttering blubbering anywhere. Again I was concerned it might be a little lean at rpm . On a road section I looked behind me and saw I was putting out a nice blue smoke trail. I run 32-1 with premium. The plug was a Dark brown, and there is no spooge coming down the muffler at all.

I'm really pretty happy with it the way it is now. With all the settings at what the Owners manual calls for, the bike is horribly rich at start up, take a while to clean out, and then when you start riding tight trails and lugging it a little it will sputter and load up from time to time. I'm reasonably certain I can keep the bike running well just playing with the needle clip, and leaving the pilot & main jets alone. I think the charts in the manuals just don't work for me, just a safe place to start. I also think the diagram showing what part of the carb jetting affects what part of the throttle opening is a little misleading taken at face value. I think the actual overlap is greater.

I have my bike set up with the gentler ignition mapping and the green spring on the power valve. This set up works for me, the power comes on steady and strong from down low to high rpm. When I got it the yellow spring was installed and it had a decent hit when she came on the pipe.

I don't compete, just a 57 year old trailrider with a bunch of years on bikes.
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