Board index The Extra Bolt Garage Jetting info

Jetting info

Post your mechanical questions here. Tips. Trick. Techniques.

Post Thu Jul 27, 2017 9:55 am

Posts: 16
Hey guys I'm looking for a little info with jetting. I have a 2016 ktm 250xc, the only mods I have done to the bike is a fmf gnarly pipe and a fmf powercore 2.1 silencer. When I installed the pipe and silencer the instructions said to use stock jetting so that's what I've been doing. The jetting doesn't seem far off to me but maybe a little rich. If you guys are running the same set up any info would be appreciated. Last time I checked the plug it was chocolate color and a little wet. Thanks

Post Mon Jul 31, 2017 12:13 pm

Posts: 581
Go stock (the chart at the back of the owners manual) and make small adjustments with the air screw after the bike is fully warmed up. This assumes (1) your crank seals are not leaking (2) you don't have any air leaks between carb and cylinder (3) your carb jets are clean (4) air filter is clean and (5) your silencer is not plugged up.

Maybe the aftermarket silencer is affecting it, don't know about that, but to check put your stock silencer back on (stock silencer is nice and quiet and more than adequate power in my opinion).
"It just needs a carb cleaning"

Post Mon Jul 31, 2017 2:19 pm

Posts: 119
I've always gone one step leaner than what the book says. I also have a 2007 300 so it's older and a little different.
If you want a terrific headache go to the KTMTalk forum and read the million pages of jetting posts. I tried out the JD jetting kit and it runs real well from his suggested setting. Good luck!
AMA
NETRA #4073
PSTR #471
2007 ktm 300xc
1983 ktm 250 mxc
1984 ktm 495mx
1984 ktm 125
1985 ktm 125
1986 ktm 125
1988 ktm 125
1994 Honda xr80r

Post Tue Aug 01, 2017 2:55 pm

Posts: 16
thanks for the feedback guys. I'm going to make small changes one at a time and see how the bike reacts to those changes and go from there.


Return to The Extra Bolt Garage