Riding sand at the moment.

Temp was 12-15degs.

MJ: 172
PJ: 42
Needle: NEDW clip #2

Having changed from 175mj to a 172mj made a massive difference, bike feels like it's got nitrous now in the top half of throttle. Also runs nice and clean.
I have bought a Beta 200rr that will become the bush bike now so I can devote this Gasgas to wide open sand etc.

Hello from France,

GasGas EC 250 converted to 300 - 2012

Main jet: 172
Pilot jet: 38
Needle: NECH
Clip position: 1 from top
airscrew: 1.75 turns out from seated
Throttle valve/slide = #7

Gas: 98 octane gas
Mix: 1.5% 100% synth?se oil
Altitude: 300 to 1100 meters
Modified original cylinder head, squish 1.3 to 1.7mm close to the center of the piston.
RV is now 14,3:1 (13,2:1 stock)
Stock exhaust

Moved out to Arizona, took a while to get a good jetting setup here.

Bike: 1999 EC200. Original PWK 38 AS-I carb.

Altitude: 2000-3000 feet (Phoenix area - New River, Wildcat, Mile Markers, etc.)
Temperature: 50-90 F. Generally low humidity, even on cooler days.

Main: 172
Pilot: 42
Needle: R1470M, 4th clip
Slide: #7
air screw: 1.5 turns out

Bike pulls clean and crisp off the bottom, though it's a little lean on overrun. I might try a 45 pilot and a little more air screw to clean things up on colder days.

I'm running, pretty consistently, 1 step leaner settings out here than I was at sea level on the east coast. And that goes for every bike in my stable, not just the GG. The dry air and the elevation seem to make a difference.

Bike year & model = 2013 EC300
Temperature (degF) = UK!
Elevation (feet) = sealevel - 1000ft
Main jet = 175
Pilot jet = 42
Needle & notch = N3CJ 04 CLIP 2
Air screw setting = 1.5 TURNS
Throttle valve/slide =

Results:
Clean all the way through - approx 9 miles per litre of fuel

Doc,

I was thinking the same setting for Sea level in UK. Is the setting good for WOT on mx tracks or stick with 175 main with NECH?

GasGas EC 200 - 2012 Six Days

PWK38 ASII (2 bolt cap)
Main jet: 168
Pilot jet: 35
Needle: N4DW
Clip position: top clip (leanest)
Slider: #7
airscrew: 1 turns out from seated
Mix: 50:1 Motul
Altitude: Sea level @ 20-25 C
stock exhaust
9mm float height

Crisp, easy to start, idles strong, Good 1/8 to 1/2 throttle usage (slow technical riding)
Plug a nice brown with minimal to no spoog

2011 EC 250e


Keihin 36mm (36 cast on cap)
168 Main
38 Pilot
CGJ needle 2nd position with shim( didn?t notice that the first time I pulled it)
Slide stamped 65
AS 1-1/8
Idle 7-3/4

600-2500 feet riding
Hot and humid southern riding in summer
Cool and damp in the winter

2011 EC250 Six Day
 

PWK38 ASII (2 bolt cap)
Main jet: 175
Pilot jet: 40
Needle: JD Jetting Red
Clip position: 4 (almost richest)
Slide: #7
airscrew: 2 turns out from seated but doesn't really matter
Mix: 50:1 Klotz TC2
Altitude: <1000ft
FMF
7mm float height

I have had this bike for abut 5 years and it has always run well. Crisp and strong with very little spooge. It has the typical idle where it seems normal but then almost dies after about 15 sec. I have always used a 50/50 mix of 110 Turbo Blue and Shell 93 but started using straight pump gas last year and the jet block gasket failed and now its hard to get it back to where it was even with a new jet block gasket. Posting here before I try different slides and needles and will update if I improve things.