Posts
51
Joined
5/4/2015
Location
Boise, ID
US
Edited Date/Time
5/14/2015 6:39am
Just bought a used 2014 KTM 250 SX with very little hours on it. It still has the original tires on it and they have only a little wear on them. It has a Pro Circuit Pipe with a Type 296 silencer/SA on it.
I took the bike out this past weekend to ride and it seemed to be pretty rich in the low and mid range and felt a little lean on top. I ran okay with it for about 2 hours, but then took a break to eat and drink. The bike cooled down and when I went to start it back up it fouled the plug. I put a new plug in and it started right up like before, but I wanted to test it and see what the plug looked like after a quick 10-15 minute run. The plug was wet coated in gas/oil.
I have done a lot of reading on this forum, thumpertalk and ktmforums and this bike appears to have some issues with the stock jetting. Those issues appear to be very similar to the ones I experienced. I haven't had time to dig into the jetting just yet so I'm not sure where I'm starting with as far as jets and needles, but I was told it was stock. I plan to confirm that later this week when I get the time to take the carb apart.
My question for those of you that have the jetting for these bikes figured out is how would you alter the jetting for elevations of 3000-6000 feet?
I hear a lot of good things about the NECJ needle, 40 PJ and 160+ MJ, but most of the people talking about that setup are at or near sea level. I have talked with a few guys here locally and they seem to think a 160-165 MJ, 38-40 PJ and NEDK needle is a good setup. Seems pretty close to what you guys have suggested. I bought a few jets to play with on the MJ and PJ, but the needle is the one thing I don't know about. How does the NEDK compare to the NECJ for my elevations? Is there a different needle I should consider?
Thank you for any help or insight you can provide.
I took the bike out this past weekend to ride and it seemed to be pretty rich in the low and mid range and felt a little lean on top. I ran okay with it for about 2 hours, but then took a break to eat and drink. The bike cooled down and when I went to start it back up it fouled the plug. I put a new plug in and it started right up like before, but I wanted to test it and see what the plug looked like after a quick 10-15 minute run. The plug was wet coated in gas/oil.
I have done a lot of reading on this forum, thumpertalk and ktmforums and this bike appears to have some issues with the stock jetting. Those issues appear to be very similar to the ones I experienced. I haven't had time to dig into the jetting just yet so I'm not sure where I'm starting with as far as jets and needles, but I was told it was stock. I plan to confirm that later this week when I get the time to take the carb apart.
My question for those of you that have the jetting for these bikes figured out is how would you alter the jetting for elevations of 3000-6000 feet?
I hear a lot of good things about the NECJ needle, 40 PJ and 160+ MJ, but most of the people talking about that setup are at or near sea level. I have talked with a few guys here locally and they seem to think a 160-165 MJ, 38-40 PJ and NEDK needle is a good setup. Seems pretty close to what you guys have suggested. I bought a few jets to play with on the MJ and PJ, but the needle is the one thing I don't know about. How does the NEDK compare to the NECJ for my elevations? Is there a different needle I should consider?
Thank you for any help or insight you can provide.
The Shop
my rides typically start at 4500ft and go up to 6500.
The jetting digger suggested to me for 3k ft above sea level was 162 mj, 40 pj, NECJ needle in 3rd position, and AS 1.5 turns out. It felt very good and the only thing I might need to change is a bigger mj. It still felt a little lean on top. The temps today were only 65-70 degrees so once as it gets hotter that 162 might be fine.
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