Fuel Mileage...EEEK!

[GMP]

The head mod does help. My '03 was originally the piggy of the three but cleaned up nicely. 45 to 55 till reserve depending on the right hand, you should not need a big tank for these bikes for enduros. Even the 300s are pretty good when set up right, WAY better on gas than the KTM300s I've had experience with.

I never saw a new PWK AS II carb, but I would think it logical that the float valve should be just closing as the float is level. This works out to be 16mm in the original AS carb.

[wasp4banger]

Not so sure about miles, but know my 300 does most hare & hounds 3 hours on a tank full. Wide open going about 2 & 1/2 hours.

Mate's KTM 300 uses at least a third more fuel

[widebear]

Originally Posted by GMP

The head mod does help. My '03 was originally the piggy of the three but cleaned up nicely. 45 to 55 till reserve depending on the right hand, you should not need a big tank for these bikes for enduros. Even the 300s are pretty good when set up right, WAY better on gas than the KTM300s I've had experience with.

I never saw a new PWK AS II carb, but I would think it logical that the float valve should be just closing as the float is level. This works out to be 16mm in the original AS carb.

This is for the AS1 but prob will apply for the GasGas AS2 as well




Uploaded with ImageShack.us

[iajim]

This might seem redundant, but what is your gas/oil mix, 50:1? If you drop to 40:1, (and re-jet), or even if you're jetted for colder temps, your mileage will drop. One size richer on the main and one position on the needle made a 10 mile difference with a 3 gallon tank on my old KDX.

[mcnut]

I checked the odo. Mileage is accurate.

I'm running 50:1 with a 180 main, OEM needle in the middle, air screw 2 1/4 out. It's cold here! The thing runs like a scared rabbit when I release the hounds.

[GMP]

There are a lot of variables, and cold is not helping. Still though, in the 20s is pretty bad and I never had anything that thirsty even with somewhat sloppy jetting. KTM300s go around 35 miles on a tank before reserve. I'm running a 180 main with a JD blue needle in the original air striker, but not sure how the two relate as far as signature(if one tends to be overall richer than the other). I'd check/set the float as described in widebear's post, forget any specific numbers.

[TNT Cycle]

yeah I ran 55 miles on my 2010 GG 300 during clubs dual sport with stock needle in middle position, 45 pilot, 180 main in 40-50F weather. My bike leaks gas out of gas cap vent also and I never ran out during 55 miles. That was with my ICO Checkmate on mileage it seems accurate as it was on in every enduro I did. That 55 miles was at a piddly pace but it did it...

[iancp5]

When I had a 300 I could manage 60 miles of gentle riding and 50 miles reliably in the dry. It would drop if wet and muddy of course.

[Eric K]

I found with the stock float setting the carb will drain fuel out the overflow on downhills steeper than 30 degrees. If you ride in steep areas you can waste a lot of fuel out the overflow.

I set the float lower than spec by ~2 mm (when viewed as oriented on the MC). This way there is a lower fuel level in the float bowl - I spill less fuel and get better mileage. I have had no fuel starvation problems, including steep hills.

The RB designs head mod is great - it improves fuel mileage and performance.

I ge about 60 miles out of the stock tank in very tight technical terrain keeping speed up in the corners.

[2whlrcr]

I think the ole rule of thumb, is to hold the carb upside down and adjust it so, the seam in float is parallel with the base of the carb. At least that's how I did mine and it runs fine. Stock it was a lot higher. Not sure on the exact measurement.