2010 EC300 Factory Jetting Specs - WTF?

[jeffs2200]

I tried the n3ch 3rd clip, 40 pilot and 175 main. Airscrew about 1.5 turns out.

500ft asl temps around 50degrees F.

The bike starts good and runs crisp from the first crack of the throttle. It has quite a bit more snap than with the n1ef needle. It seems to rev out better as well. I may try a 178 main and see if that makes any difference as well. It felt like it may be able to use a little more fuel up top. When you hit a long straight at wot then back off it would make a little noise, or surging. Very little but enough to make me think it could use a little more fuel.

[Jakobi]

Originally Posted by jeffs2200

I tried the n3ch 3rd clip, 40 pilot and 175 main. Airscrew about 1.5 turns out.

500ft asl temps around 50degrees F.

The bike starts good and runs crisp from the first crack of the throttle. It has quite a bit more snap than with the n1ef needle. It seems to rev out better as well. I may try a 178 main and see if that makes any difference as well. It felt like it may be able to use a little more fuel up top. When you hit a long straight at wot then back off it would make a little noise, or surging. Very little but enough to make me think it could use a little more fuel.

Glad to hear it was a positive change. It'd be interesting to see the results of going to clip#2 with a 178 main.

I found the N3 needle really cleaned up the whole rev range.

[jeffs2200]

I will try the larger main first and see what that does. I will then try clip#2 and see how it goes.

The bike pulled really well and did not feel rich at all.

[Jakobi]

Makes me wonder why I have to run mine on the top clip to get the nice crisp response. Could be something to do with the 30C and 70+% humidity here in the tropics. Your needle is a bit leaner than mine.

I have also read of people using the current yz250 needles with good results. N3EJ/H, which is only half a clip difference than the one you are using.

When will you have some video up Jeffs?

I'd also be interested in knowing how it stacks up against your KTM in the engine department.

[jeffs2200]

It is not a real fair comparison to the KTM. My KTM has a Slavens ported cylinder, and an sx head with a procircuit platinum2 pipe. Trying to remember how they stacked up stock is kind of tough.

The KTM has way more hit than the GG 300. I really like the smooth power delivery of the GG. I do prefer the way that KTM has the tuneable powervalve via springs and the adjuster dolly screw. I ran mine with the red spring and the dollyscrew out flush to the cases which is the most aggressive setup. I am a big guy so that helps tame the power. I let some of my smaller friends ride my KTM and they can not see how I race it in tight woods like that. They seem to prefer the more mellow power of the GG.

[Jakobi]

Sounds like a weapon! This is my first 2 stroke so haven't really got anything to compare against, however I wouldn't weigh any more than 80kgs geared up so find the GG just about right.

Its pretty dull to ride on the wet setting.

[swazi_matt]

I am running the N3EH needle and everything seems fine and crisp, brown plug, no spooge out the exhaust, but i only get about 70km on a std tank. This is generally slow tech riding, but just seems a bit heavy on juice.

what are you guys getting on a tank (mix ratio of 40:1)

[Jakobi]

I managed to get 110km before reserve last ride. Wasn't very much in the tight and technical, more muddy and rutty. Still alot of on and off the throttle, and when I was on it I was on it hard. Probably most time on the pipe the bike has seen yet, and the best fuel economy, however I'm running on clip #1, at clip #2 I hit reserve at 95km. I'm also running a 38 pilot and a 175 main.

My plugs are nice and tan all over. loads up a bit if left idling too long.

[moto9]

If you don't want to spend too much time jetting, the other option is a JD jet kit...his kits are pretty close if not spot on.
The kit comes with the necessary jets, high and low altitude needles, good jetting directions and tech support with a phone call.
The good thing about a kit is the research and testing is already done and everything you need is in one kit.
Just a suggestion

[GMP]

A big +1. For a 250 anyway this is as good as it gets. I can let my bike idle leaning on a tree while I help one of my kids if needed.