Gas Gas EC300 2010 2 Stroke

Special thread for a special bike

So of late I have been chasing up some annoying excessive vibration as the revs drop after a lick of throttle while stationary in idle. The vibration is present in both feel and audibly. I had just chased down the power valve thinking it may have been at cause but its well in spec.

My bike had previously been running N3EG#1, 38 Pilot, 175 Main. Which was nice and crisp but still a bit fat right off idle. A slight burble when rolling on from closed.

I went to N3CH #2, still with the 38 Pilot and 175 Main. The bike was definately slower to rev off the bottom, although sounded cleaner. It felt like it wouldn't rev really fast, but it wasn't bogging or hestitating. Just not pulling as hard or fast as it should be until later in the revs. Suspected slightly rich until clearing and coming strong onto the main.

Today I lifted the clip N3CH #1, same 38 Pilot and 175 Main. My god! Cracking the throttle right off idle was tearing up the lawn. Out onto the street and I was struggling to get the rear end to hook up on the slightly moise bitument. 2nd gear right off idle, a quick flick of the wrist will have the front end skyward. The bike feels almost like it would be too much to handle in the dirt. Its incredibly crisp and responsive and pulls really strong through to the pipe limit. The vibration as the revs drop also feel to have been reduced alot. Much less evident than they were. Bike also idles really well. Still blows a bit of smoke right off the bottom even opening the throttle while the engine is hot.

My main concern is that the bike will be too lean. I worry because everyone else is running these needles at clips 2 and 3, even with the 36 mm carb. My bike has the PWK 38mm ASII. Elevation approx 300m most of the time. Temps in the mid 20's. Humidity varies day to day.

I guess I will have to find some time to do some partial plug chops and see what stories they tell. What is everyone elses opinions? I have ran the bike with N3EG at clip 1 for over 1000kms without ill effects. N3CH at clip one is half a clip leaner again.

Perhaps I'll try the N3EJ I have at clips 2 and 1 to grasp a feel. I have some video of the bike on the stand which I will try and post to help.

In others experiences, will fattish jetting cause an increase in engine vibration? Why does my bike need to run so lean compared to others? The float height is good. Bike only has 1600kms on the clock.

Good info thanks for sharing. I have the 2010 GG 300 and I am running the CCK needle, 2 nd clip, 175 main, 42 pilot, and 2 1/2 turns out. 300 FT, temps around 70-80*. My bikes pulls very well through the gears but it doesn't sound like it snaps as hard as yours does in the first crack of the throttle. I wonder if it could be the difference in pj sizes?

Good info thanks for sharing. I have the 2010 GG 300 and I am running the CCK needle, 2 nd clip, 175 main, 42 pilot, and 2 1/2 turns out. 300 FT, temps around 70-80*. My bikes pulls very well through the gears but it doesn't sound like it snaps as hard as yours does in the first crack of the throttle. I wonder if it could be the difference in pj sizes?

Hi John,

I have moved back to N3CH#2. It is definately not as snappy particularly in the lower part of the rev range. It felt really nice in a pre warmed bike the day before but starting cold it took quite a while to warm up. I feel its probably borderline too lean. I could try it with a larger pilot at a later date. I will be looking to to shim it up half a clip pos possibly too.

And again after a day of testing many needles I have found the following to provide the best performance.

40 N3EJ#1 178

Very crisp and responsive through the entire rev range continues to build power. Mild hit mid range. Noice!

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