Bike year & model = 2003 EC200
Temperature (degF) = 68 - 100
Elevation (feet) = 1300 – 2500 ( roughly varying )
Main jet = 178
Pilot jet = 48
Needle & notch = N3HJ - 2
Air screw setting = 2 3/4
Throttle valve/slide = 5

Results: I use this setting all year round. I have found that it is very smooth from bottom to top. Air screw was 3 ¼, but wouldn’t idle when warm, now at 2 3/4. I’m considering moving needle to middle notch for better bottom end. Am using Motul 800 mixed at 50:1.

08 ec 300...had the bog off idle..was cured with a cck needle#3 position,178 main,42 pilot..2 turns out on air screw..runs perfect..thanks

what elevation are you running at??

2001 ec-300 with motocross ign and RB style head mod
Temperature (degF) = 40-90
Elevation (feet) = 2200- 5800
Main jet = 165 messico & doma pipe, 170 fmf pipe




Pilot jet = 35
Needle & notch = Kawi N3YF #3 notch
Air screw setting = .75 turn out
Throttle valve/slide = #9

Results. Very crisp throughout the rpm range, pulls hard with instant throttle response and good high rpm power , Caveat , would not ride in sand with this small a main jet, 10 minute road section at W.O.T. with no problems and no overheating

Bike year & model = 2004 DE250
Temperature (degF) = 50 - 70 degF
Elevation (feet) = Sea level to 1000 ft
Main jet = 180
Pilot jet = 45
Needle & notch = LTR -0 #3
Air screw setting = 1-1.5 turns out
Throttle valve/slide = #7

Results:
Much cleaner jetting that my prior post. Bike runs strong and smooth in conjunction w/ .45mm base gasket on my cylinder.

GG27 revised settings
 

Bike year & model =EC 250 2008
Temperature (degF) =60 TO 85
Elevation (feet) =0 TO 1000
Main jet =182
Pilot jet =45
Needle & notch =LTR - 0 #3
Air screw setting =1 to 1 1/2
Throttle valve/slide =#8

Results:After changing slide to a #8 I raised the pilot from a 42 to a 45 and bike runs strong throughout with no bogging at all. I changed silencer from the standard banana to the MC and hits stronger with better throttle response from mid to top, signs off a little quicker. Now I can tell the difference with the dual map switch. I prefer the standard long silencer, it gives a broader spread for overall use, MC silencer is good for the motocross track or rain setting for tight woods.

Bike year & model = EC300 '07
Temperature (degF) = 70
Elevation (feet) = 50 / about 1010mbar / 70% rel. humidity
Main jet = 175
Pilot jet = 42
Needle & notch = LTR #3
Air screw setting = 1.5 turns
Throttle valve/slide = #7

FMF Gnarly, otherwise stock.

Results: Very happy. Idles good, clean & strong through whole range, average about 4 liters/hour at (my slow) race pace, no spooge, black threads on sparky but tan electrode.

Peculiar: After starting cold with shortest possible use of choke, I allways need to run it hard through the gears to clear it out. After that it can run at really slow speed for a long while without loading up.

Bike year & model = 2005 DE250 (11oz FWWeight)

Stock reeds. LTR needle with clip on position 2. LTR PV cover. Stock slide.

Winter in Phoenix:

Temperature (degF) = 40 - 80
Elevation (feet) = 1100 – 2500
Main jet = 178
Pilot jet = 45
Needle & notch = LTR - 2
Air screw setting = 2 1/2
Throttle valve/slide = stock


Summer in Phoenix:

Temperature (degF) = 80 - 110
Elevation (feet) = 1100 – 2500
Main jet = 172
Pilot jet = 42
Air screw setting = 1 1/2


Summer in Flagstaff:

Temperature (degF) = 75 - 85
Elevation (feet) = 7,000 – 9500
Main jet = 165 (I gave the 168 a try -- almost but not quite lean enough -- a little burble on top. 165 did the trick and was particularly crisp if I dropped the needle to the first clip).
Pilot jet = 40
Air screw setting = 2 1/2

Bike year & model = 2006 EC 300
Temperature (degF) = 50
Elevation (feet) = 0 - 1000
Location = Cork, Ireland
Main jet = 178
Pilot jet = 42
Needle & notch = CCK clip 3
Air screw setting = 1.5 turns
Throttle valve/slide = No. 7 slide

Results:
-------------------------------------------------------------------------
Riding style: slow technical trails and fast open paths
Premix: Using RockOil Syn 2 race mixed about 45:1.

Performance: I thought this bike was good with the N1EF needle but the CCK has made this bike one I want to keep for life !! Awesome midrange now.

fergus ....I've got an 06 300 with almost identical set up ....
how is your gas mileage?? Mine sucks. I ride mostly tight technical stuff 1st and 2nd gear.