N3EG - 1/8 stumble and lean 1/2 throttle

[krazy]

Hi,

I'm getting a slight rich condition at 1/8 throttle (but not too bad) and I've just done a plug chop at 1/2 throttle on a nice long 3/8 mile hill, see photo.

AS 1
40 pilot
N3EG top clip (leanest)
175 main
Motul 800 32:1
0-500ft 20c

The plug is light grey colour, definitely not tan or chocolate brown like we aim for. Is that too lean? I'm hesistant to do a WOT chop unless the 175 would be enough to richen it back up.

I can live with a slight richness at 1/8 throttle but I don't know about correcting a lean 1/2 throttle by using a richer needle and then having too much stumble at 1/8. So in my mind I am thinking a needle with richer diameter (leaner) but coming onto the taper sooner (lower clip pos) to fatten up the mid. Does that make sense or is it possible with N3xx needles? I thought they all had the same taper so all were about the same at half throttle.

Bike is powerful, 3rd gear power wheelies with 46t rear sprocket, no pinging.

[Jakobi]

Leaner diameter needle.
Richer clip position.
Richer main jet.

Leaner diameter may require a richer pilot jet to maintain the idle mixture.

N3EH/N3CH/N3EW/N3CW

[krazy]

Originally Posted by Jakobi

Leaner diameter needle.
Richer clip position.
Richer main jet.

Leaner diameter may require a richer pilot jet to maintain the idle mixture.

N3EH/N3CH/N3EW/N3CW

Great, will order some brass now and report back. Many Thanks.

[krazy]

small update ... while waiting for n3ew and 185 main I put the cck back in on 3rd clip with 182 main. Real rich until 1/4 throttle as expected. WOT plug chop is a light tan, a bit too light. I am concerned that the rich cck needle and 182 main is on the lean side. No one else seems to go that rich. Perhaps I can't even use a N3 needle unless I go to 190 main or something. Either I have a leak or the head and porting work is better than expected and flowing more than others.

[memphis2857]

I have been chasing jetting for months. I ended with 40p 180m and N3CH clip 3. It is pretty good across the board. Nice and crisp. It will still lean out a bit on a long uphill but it's not bad any richer and it gets blubbery.


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[krazy]

Originally Posted by memphis2857

I have been chasing jetting for months. I ended with 40p 182m and N3CH clip 3. It is pretty good across the board. Nice and crisp. It will still lean out a bit on a long uphill but it's not bad any richer and it gets blubbery.

That's a point, I have been doing plug chops on a long hill, going 70+ by the time I shut her down. I suppose that gives it a lot of time to lean out, and not representative of a typical ride.

Your conversation with Jakobi a few months ago helped me decide to try the N3 needles so thanks for that. Hopefully the 185 main will be enough to keep things safe. Fingers crossed.

[memphis2857]

I tried doing plug chops and just never had any luck jetting that way. It's not "real world" riding conditions. If you really want to read your plug I think the most effective way to do it is after a typical days ride. That will give you an idea of how the bike is running as a whole. Just jet the bike where it runs good and doesn't bog or burble and then just go out and ride and enjoy life. I have friends that are so obsessed with jetting that they put a threaded bung in their pipes and use Air/Fuel meters to tune their bikes. Lol


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[Upyourkiltbatman]

I've tried loads of different setups on my 2011 300 , and stuck with ne3w clip 2 40 p. 180 main the bike is fast and aggressive with a nice plug colour only thing is i don't need choke to start from cold , second kick , don't know if this is a problem as it runs and idles good ?

[memphis2857]

Originally Posted by Upyourkiltbatman

I've tried loads of different setups on my 2011 300 , and stuck with ne3w clip 2 40 p. 180 main the bike is fast and aggressive with a nice plug colour only thing is i don't need choke to start from cold , second kick , don't know if this is a problem as it runs and idles good ?

I don't have to use the choke in the summer either. Bike will sit and idle all day long. I have the same jetting except I use the N3CH clip 3


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[krazy]

Just an update, I've got the n3ew installed, and after lots of clearing out it runs pretty good. But something wasn't quite right. Then I noticed I am losing some gearbox oil. I'm pretty sure that is what's happening anyway, possibly right side crank seal from what I can gather. Clutch cover is also weeping a bit. Probably why I have been chasing my tail. Never been into a 2T engine before so going to research that next. Sigh.....