best needle for stock 05 kx250

What temperature and altitude are you jetting for?

Where'd you hear that?

quote from MXA "It was a good thing we tested the 2006 KX250 in the heat of summer. If it had been winter, with more oxygen in the cooler air, the KX would have pinged itself to death. The jetting is lean, even for normally rich 100-degree weather. We replaced the 160 main with a bigger 162-and could have gone richer."

I could believe that because with almost every youtube result of an 05, the bike pings. http://www.youtube.com/watch?v=t-W6XiBOAK8

What temperature and altitude are you jetting for?

right now cooler weather, 50 degrees, and whatever the altitude of PA may be

quote from MXA "It was a good thing we tested the 2006 KX250 in the heat of summer. If it had been winter, with more oxygen in the cooler air, the KX would have pinged itself to death. The jetting is lean, even for normally rich 100-degree weather. We replaced the 160 main with a bigger 162-and could have gone richer."

I could believe that because with almost every youtube result of an 05, the bike pings. http://www.youtube.com/watch?v=t-W6XiBOAK8

Well, Pro Circuit and Team Green recommend the stock needle on the 05.

My bike doesn't ping, and I'm running a 155 main, stock needle and a 45 pilot. Albeit, I plan on going to a 160.

Well, Pro Circuit and Team Green recommend the stock needle on the 05.

My bike doesn't ping, and I'm running a 155 main, stock needle and a 45 pilot. Albeit, I plan on going to a 160.

Hm...would you say the bikes sounded lean in the 2 vids? especially the second one it sounded horrible

Hm...would you say the bikes sounded lean in the 2 vids? especially the second one it sounded horrible

Dude, the last thing I'm gonna jet my bike by is a video from Youtube. Ride your bike and look at the plug. :bonk:

According to the table from the manual, you should be running the following:

Needle: NTFG

Pilot Jet: 50

Main Jet: 160

Clip: 2nd clip

Airscrew: 1.5 turns out

If you're closer to see level (this is for 1000m) ,

Needle: NTFG

Pilot Jet: 52

Main Jet: 164

Clip: 2nd clip

Airscrew: 1 turn out

You can use this calculator, just convert your altitude and temperature to meters and degrees Celcius

http://www.mediafire.com/file/tnggwznztjn/Jetting Chart REV 2.xls

If you're closer to see level (this is for 1000m) ,

Needle: NTFG

Pilot Jet: 52

Main Jet: 164

Clip: 2nd clip

Airscrew: 1 turn out

You can use this calculator, just convert your altitude and temperature to meters and degrees Celcius

http://www.mediafire.com/file/tnggwznztjn/Jetting Chart REV 2.xls

I'd leave an oil slick running a 52 pilot.

Is that wrong??

the manual totally baffles me, but maybe real riders are so much faster that their settings are not insanely rich, or maybe the spark arrestor requires much leaner jetting.

on my 2007 i have found that the nalx or nafx series needles suck less than the nftg, but so far for my riding style i prefer the jd blue. it runs cleaner off-idle and hits less suddenly.

not sure how applicable it is to the 2005 (which may also need airgap adjustment to help the ping), but for fall in idaho (3000-5000', 40-70 degrees), i'm currently running a 38p, jd blue #4, 160 main.

nafh#2 and 155 main also works well , but is not as clean for low-speed lugging. This is with a gnarly pipe and q-silencer, but as far as i could tell the jetting requirements were about the same with the stock pipe. I only put the gnarly on 2 weeks ago.

Mine came with a NALF but the jetting was FUBAR so I went to stock as a starting point to sort things out. I have the clip at #2 and have had good results. I may try the NALF just to see what difference it makes.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now