250 tank Range

[andoman]

Two weeks ago at a H/S I went 33 miles before having to put the bike(11 '250xc) on reserve, and then another 6 mile on reserve. There was less than 1/4 of a cup of fuel in the tank after driving it back to my trailer. I could not have gone another 1/4 of a mile before it would have been bone dry. I could not find my gas can that I had put in the woods on the 3rd lap. I was pissed and took a chance. It payed off. I won the race.

Definitely thirsty. Out of curiosity what is your jetting? With the stock jetting, my bike was getting obscenely poor mileage.
I wish I would have done one thing at a time: Jetting, head mod, float height. I did it all at once based on research here.
Realizing that every bike is a little different and every rider rides differently, I'm still curious what basic gains are to be had each step of the way over the stock set-up.

 

[Jakobi]

Definitely thirsty. Out of curiosity what is your jetting? With the stock jetting, my bike was getting obscenely poor mileage.
I wish I would have done one thing at a time: Jetting, head mod, float height. I did it all at once based on research here.
Realizing that every bike is a little different and every rider rides differently, I'm still curious what basic gains are to be had each step of the way over the stock set-up.

Every clip position (or half) makes huge difference to economy on these bikes. Thats the best I can put it. My EC300 with N3EJ#3 would hit reserve at 70kms. With it at clip position #1 it did over 100kms without going to reserve. N3EJ#2 was acceptable. N3CJ#2 got me the best combination of power and economy with smooth top to bottom. Maybe not 100% strongest power, but definately matched to my riding style on the 300. The stock needle hit reserve at 80kms after adding another L to the tank. Thats all the stock engine, stock squish band (2.6mm). Stock stock stock!

On the same bottom end, 250 top end with corrected squish and CR I am finding the engine is asking for more fuel through the mid range and as such I've had to go a clip richer on the needle. The bike feels richer and sounds richer, and initial tests shows its drinking more fuel as well. I've also just had the transition to winter here as well which could be playing into it all. I've noticed the rest of the KTM 2T parties have had to richen up a clip so that could be a consideration for the 250 wanting more fuel too.

Like I said. For me needle, and particularly clip pos seems to have a huge effect. It should as most of us ride on the needle most of the time. Smaller capacity engine, in a race scenario vs trail, more load on the engine, more fuel required. *shrugs*

 

[GMP]

I'm running the JD Blue needle, which is a fairly rich dia., and a 180 main in an '07. I'm sure technically its a bit rich, as it spooges some, plug is dark, and smokes maybe a bit more than you would think is should. Under light load I can feel a very short burble off idle too. So, yeah, its probably a pig under the jetting microscope. The thing is, it has very strong power everywhere, runs cool, gets good milage, and outstanding top end life. I don't mess with it constantly either. Pilot changes in summer and late fall, thats it, no needle changes. On a 250 you don't dwell in one area, you work the throttle more, so its easier to jet. Try to get too precise, neat and clean with the jetting and you loose torque. Loose torque and you find yourself in a lower gear more often. Thats where your fuel goes. You could also re-evaluate your gearing. For example if you lower gearing a bit you could tighten things up and pull a taller gear more often.

 

[MJC]

Definitely thirsty. Out of curiosity what is your jetting? With the stock jetting, my bike was getting obscenely poor mileage.
I wish I would have done one thing at a time: Jetting, head mod, float height. I did it all at once based on research here.
Realizing that every bike is a little different and every rider rides differently, I'm still curious what basic gains are to be had each step of the way over the stock set-up.

For that race I was using an NEDW Needle #3 clip, a 42 pilot and a 172 main. I think I set the float level to 8mm. The head has been modified and the squish set at 1.27mm. I was/am using a 49 tooth rear sprocket and an FMF Gnarly pipe. I avereged 17.50 mph over 2hrs and 25min on an 8.1 mile track.

 

[Diggs345]

What mods and jetting?

No mods as far as i know
Needle n1ef pos 2 from top
Main 178
Pilot 40
Float16mm
Airscrew 3/4 out

 

[Jakobi]

No mods as far as i know
Needle n1ef pos 2 from top
Main 178
Pilot 40

Thanks.

I have been doing some thinking and may try slipping the NOZI/NOZJ into mine with a 40/42 pilot and 172 main. Doesn't look like I'm going to get out these days off. Too many other duties calling and rain is slowing them down too. I'm stinging to get this little 250 out for a decent ride!

 

[Diggs345]

Join the club , im working 3 weeks on 1 week off currently , im out on saterday though

 

[skid jackson]

rode the new england classic charity ride this weekend. Did 110 miles on Saturday. odo seemed a bit off so lets call it 100. Used 3 gallons of gas so call 33 mpg. spent most of the day one gear up. was on the pipe when I needed to be mostly woods road with some nasties sprinkled in. fair bit of regular road. 36 mm AS2 42 pilot 175 main 2nd or 3rd slot nedw. seemed like reasonable mileage to me.

on a side note I was with an 03 wr 450 and an 05 kdx 200. We all used 1/2 gallon for the 15 miles to first gas

 

[Jakobi]

I ran the 250 95kms and only used 6.5L to top the tank off. Very mixed though including some decent hills, some fire trails, single trails and even a stint on the black stuff. Definately trail pace though. Husaberg 300 used 7L for the same distance at same pace. That was 45 N3CJ#3 178