GasGas EC 300 Racing - Spluttering

[GasGasHungary]

Hello

I wonder if anyone can help me? I have just purchased a new GasGas EC 300 Racing and right out of the box it has a very bad splutter when accelerating. When accelerating (With the Mapping Switch in either position) in all gears, the initial acceleration is OK (for a second of so) and then it starts to splutter and the only way to go faster is to change up a gear, but it all jerky and hit and miss. There is a lot of smoke coming out of the exhaust and the back end of the bike is covered in oil from the exhaust. My guess is that its running too rich. No jets or Carb settings have been touched ie. Its all at factory settings. Further information is, its Winter here and is between 0 and 10 Deg C, plus we are at 100m above sea level, so all is fairly normal.... Is it normal to receive a GasGas in such a state and, does anyone agree that its running too rich, if yes to the latter, What are likely to be the main causes? Thanks.

[GasTimppa]

Originally Posted by GasGasHungary

Hello

I wonder if anyone can help me? I have just purchased a new GasGas EC 300 Racing and right out of the box it has a very bad splutter when accelerating. When accelerating (With the Mapping Switch in either position) in all gears, the initial acceleration is OK (for a second of so) and then it starts to splutter and the only way to go faster is to change up a gear, but it all jerky and hit and miss. There is a lot of smoke coming out of the exhaust and the back end of the bike is covered in oil from the exhaust. My guess is that its running too rich. No jets or Carb settings have been touched ie. Its all at factory settings. Further information is, its Winter here and is between 0 and 10 Deg C, plus we are at 100m above sea level, so all is fairly normal.... Is it normal to receive a GasGas in such a state and, does anyone agree that its running too rich, if yes to the latter, What are likely to be the main causes? Thanks.

If you have N1EF needle in your carb I'll suggest to try 40/ 178 (-180) jetting. We have simillar weather and about same altitude. Needle in 2"st from top.

[Jakobi]

And make sure the float height is set correctly.

http://www.gasgasrider.org/forum/showthread.php?t=11886

Then start working on the jetting. Once you establish what our baseline is we'll be able to help you dial it in.

[SGM]

Float level set, a ktm n3eg needle @3, 40 / 178

[GasGasHungary]

All

Thank you for your responses and assistance. On Friday I will strip out the Carb and check against your feedback.

Sorry for the questions, but could you please explain

1. If you have N1EF needle in your carb - How can I tell?
2. 40/ 178 (-180) jetting - What does this mean?
3. Needle in 2"st from top - This means 2nd position from the top?

Thank you.

[Jakobi]

The needle will have a code stamped on it up the top near the clip grooves. The stock needle is N1EF. Clip positions are counted from the blunt end towards the pointy end.

The 40/178 is referring to pilot and main jets, respectively.

Do some reading on general jetting theory, youtube etc, and get a feel for how a carb comes together and apart. You'll have to pull it down in order to check all the jets and clip positions.

[husley]

New bike debris in the pilot jet?

I have had two new bikes who's floats would stick in random locations until they broke/wore in

[GasTimppa]

One possibility is debris under choke piston.

[GMP]

ALWAYS flush a new tank clean and install a fuel filter before use, as there will almost always be some plastic shards present from the molding/mfg. process. Yes there are filters in the tank but they seem to come off the pick up tube (mine was bouncing around in the tank).

[GasGasHungary]

Dear All

Thank you for all of your sound advice, help and explanations. This weekend I will take a look at the Carb and will report all back to you. Thank you again.