2010 Jetting Saga Continues

[GMP]

It should not be this hard. I'd try a #8. My 250 runs perfect with a JD Blue and a #7, and a 300 is a bigger pump with a bigger signature. It fixed a couple 300s here in the past, one in NY state so approx 0 - 1000'.

While the slide cutaway is described as affecting the same range as the needle straight dia., from experience it is a bit more broad, overlapping the low and mid more.

FWIW, If you send the carb to Ron for his mod, one thing he does is cut your slide leaner.

[Bailey28]

I'm happy with the way mine runs. I think we are looking for the perfect jetting, everyday, no matter the altitude, temperature, or load on the bike.

As I look further into the 2 stroke jetting I am starting to believe that our engines require vastly different fuel curves depending on what situation they are in.

Just putting around the yard or up and down the road? I think they need less fuel.

Climbing a steep hill while lugging it? I think that calls for more fuel.

Cool temperatures outside? More fuel

Heavy sand? More fuel

Hot temps on hard packed trails? Less fuel.

I think a 4 stroke is a little more forgiving with less/more fuel here or there. Our 2 strokes complain, bog, ping, and spooge if their butts aren't powdered every so often with a clip change here, air screw turn there...

And let's not forget the wide range of fuels throughout the world, and the range of oil mixtures, oil types, spark plugs, air filter cleanliness, gearing, altitude, hard or soft dirt, reed condition, engine wear and rider preference.

[Jakobi]

Originally Posted by GMP

It should not be this hard. I'd try a #8. My 250 runs perfect with a JD Blue and a #7, and a 300 is a bigger pump with a bigger signature. It fixed a couple 300s here in the past, one in NY state so approx 0 - 1000'.

While the slide cutaway is described as affecting the same range as the needle straight dia., from experience it is a bit more broad, overlapping the low and mid more.

FWIW, If you send the carb to Ron for his mod, one thing he does is cut your slide leaner.

Its not that hard GMP. I have been happy with pretty much all the needles I am playing with. All have worked well in the bike. I worry sometimes that I am going too lean compared to what others are using.

Other than this I am just looking for the best setup for me. Power where I need it without being too much of a handful Fine tuning and learning along the way. As I heard once before, it only takes a few minutes to make a change, and if you never bother to give it a try you'll never know if its any better.

[Jakobi]

Tried the N3EJ today on #2. Wasn't overly impressed with it anywhere.

Rode again with N3CH #1. I like this alot but I think its a bit on the lean side. Especially coming into winter.

Settled with N3CH #2. The bike idles well. Pulls smooth and strong in the bottom end. Punches into the mid and rips in the top end. The smooth bottom end could be a bit crisper but I also feel it lets me ride smoother which results in less fatigue.

I will do the unthinkable and change my fuel ratio to 40:1 to add some extra lubrication now that I'm starting to show the bike more throttle, and hopefully this will also lean things out just enough to keep me smiling.

[GMP]

When I hear bikes won't idle, air screw does nothing, and the balance is hard to dial in(needle) I think slide. Some are just good and easy, like my 250, others are more demanding like my '03 GG 250 and KTM300 was.

[Jakobi]

Originally Posted by GMP

When I hear bikes won't idle, air screw does nothing, and the balance is hard to dial in(needle) I think slide. Some are just good and easy, like my 250, others are more demanding like my '03 GG 250 and KTM300 was.

Thanks for the help.

I found I had issues with this when the needle I was using was far far too rich. Once I tapered back down I can get the pilot working with the slide and it transitions well. I'm just stuck between clip positions to get me the best throttle response from 1/4 - 1/2.. Some are too lean, others too rich. I had dreams about this even! Its consuming me! haha.. Time to stop jetting and go for a ride again.

[Bailey28]

I thought I was the only one who dreamed of jetting!

[mrkartoom]

I dream about riding. I have nightmares about jetting.

[Jakobi]

The dreams will stop when I stop stressing and start riding! Its the wondering what catches me.. When I'm riding I couldn't be happier with the bikes performance (well not much, but hardly crosses my mind)

[MJC]

I've tried almost every Needle and jetting combo on this site, and the best combo i've come up with so far for long smooth responsive power From 0'-2000' here in upstate NY for my 11' 250 is.

Needle= NEDW 4th, optional needle from an 07' Suzuki rm 250.
Pilot=42
main=175
AS=2 turns out
Stock slide