Ok so I got the same issue. Bought a 2005 G EC300. Can't make it idle for the life of me. Finally bit the bullet and opened up the carb. I'm running an N1EF needle on the last notch. A 35 main and a 170 idle at around 500 ft, above sea level. From What I've read here that seems very lean. I like it's power delivery everywhere except idle, but I've never ridden it tuned perfectly evidently. It may be even better tuned right. Anyone got a good base line to go with? Getting this carb out, or doing anything with this thing is an ordeal. Not impressed with the design. First European bike I've ever had. Jap bikes are easy to work on.
The AS1 (Air Striker 1) carburetor, which came on the earlier model GasGas bikes need to be jetted richer than the AS2 (Air Striker 2) carburetors that came on the later model GasGas off-road bikes. The AS1 on your bike has a screw on top above the slide. The AS2 has screws holding down the top. Don't run the super lean main jets with your cab. To get your bike to idle, you need a richer pilot jet and a different jet needle from the GasGas stock N1E series of jet needles.
Now, to re-jet your carburetor's slide and main jet, you don't have to remove the carb from the bike. Take off your seat, disconnect the fuel line from the carb, and remove the rear retaining strap for the tank.
Lift up the rear of the tank and keep it up with the handle of a screwdriver or a block (or something 1 1/2" thick).
Loosen the clamp on the connection between the rubber adapter and the reed valve/intake manifold; and rotate the carburetor to point it's top to the left side of the bike.
You can now take off the top of the carburetor and remove the slide and jet needle for adjustment, etc.
While the top is off the carb, rotate it the other way, and you will be able to access the main jet by removing the plug in the bottom of the float bowl.
To access and change the pilot jet, you will need to remove the float bowl.
To get your bike to idle, using the AS1 carb, I would suggest either a 42 or 45 pilot jet, 178 main jet, and a jet needle such as a NECW, or NEDJ. (your choice will be determined by how you want the power delivered as the rpms build.) There are a lot of good jet needles that will work. You just have to find the one which works best for your use by experimentation.
Start off with the Jesus clip in the second groove from the top of the jet needle. Work from thereto fine tune it. I call it the Jesus clip, because if it's tendency to fly across the room, or down into the leaves when working trailside; prompting me to yell,"Jesus!"
One thing to watch for when tilting the carb to work on it; with the float bowl removed while the carb is on its side, the pivot pin for the floats will sometimes fall out.
Good Riding and Wrenching to you!
Jim
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