N3EH/N3CH - Plug readings

[Jakobi]

Hi all,

I asked Swazi Matt this question

"Just a question about your jetting as I know our conditions are about the same. How is your plug colour and does your bike colour the plug all over or just one side?

Do you feel that you could run any leaner on the needle? I'm just tossing up if I should run N3EH#2 or N3CH#2. The later feels much crisper but both give quite lean plug readings on the exhaust side of the plug. Intake side they look really good."

I will try and follow with some pictures of each if I can get the macro function to work properly. Wouldn't mind hearing about others experiences with reading plugs and what methods work.

Reason I'm asking is that I have just tightened the squish from 2.6mm to 1.8mm and am re-assessing the jetting. It seems to have effected the needle by about half a clip. N3EH#2 now feels like the N3CH#2 did previously, but in saying this it feels best at N3CH#2. Strong and crisp but fearful of being lean.

[Bailey28]

I added in my combo 42, NOZH-1, 160 Biiiiiiiiggggg power everywhere, nearly crapped myself a few times!

[Jakobi]

Originally Posted by Bailey28

I added in my combo 42, NOZH-1, 160 Biiiiiiiiggggg power everywhere, nearly crapped myself a few times!

N3CH#2 is perfect at the 1/4 throttle mark for me. Crisp and resposive. Then I think it tapers off and is too lean from half throttle up. The bike pulls really strong but plugs indicate its running too hot. Dropping the clip fixes up the lean hole but introduces the burble at 1/4 throttle. I think that I might need to step up on the main to keep things cooler up top but first I will try out the N1EG I have here. Its one size richer on the diameter than a H, and half a clip leaner than the NOZ series. Will run it in pos 2 to start which should be similiar to NOZH#1.5.. I'll run with a 175 main to start with.

[Bailey28]

I am running 32:1 Yamalube for my premix, with pump gas.

I do like how the NOZH pulls from the very bottom, and it is smooth, the smoothest of all of the needles I have tried. This thing will lug down to zero, and still pull the front wheel off the ground.

The N3EH that I bought worked well, but was a little too lean in the midrange causing a sag that I posted about earlier. My powervalve may still be a bit loose, but going to the NOZH really pepped up the engine on a whole. I think I was a little too lean on the very bottom before and went hella rich in the part throttle area.

Now, my bike is richer at idle/just off idle, and leans out gradually as the throttle opens up. The 160 is downright scary when it comes on the main. I felt I could get away with this because of the rich 3rd taper of the NOZ series.

[Jakobi]

I take it the JD graph (second attachment) doesn't take into account the 3rd taper then, as it shows you're approx 12% leaner at WOT than the base setup..

Everyone I know here using the N1E/NOZ needles use a 172/175. I agree I think I am falling a tad lean somewhere part throttle between 1/4 and 1/2 and then richens up once on the main. If I can get something thats still the same same at 1/4 and then richens a bit should be ace.

Sigh.. Very much looking forward to finding a setup and just staying with it..

[Bailey28]

Check this out: N1EF-1 compared to a NOZH-1......

The second chart may look scary, it is 15% down at WOT on fuel from the stock 40 N1EF-1 175 setup. But in our very hot weather it runs perfect.

The chart shows it is richer at idle, but the bike idles great like this and responds instantly and is very crisp. I get no pipe knocks, bangs, or loading up. I can play as long as I want in the slow stuff and as soon as I come out, bang! it takes off like a rocket.

In cooler weather, I will bump the main up to 165 and lower the clip to 2 or 3 and see how it does.

Right now, my spark plug is actually a bit dark but the outer ring and the base of the electrode are clean.

[Jakobi]

Everything I have read about N3CH and N3EH is that they are the same except for half a clips difference. JDs spreadsheet however plots them completely different.. It thinks the N3CH follows the same tapers as the NOZ series. It thinks the N3EG does too! This is doing my head in. Does yours plot the same as this Bailey or has your new and improved version fixed this up?

Frustration big time! Need to get this sorted in the next day. You'd expect N3CH#2 and N3EH#1.5 to plot directly over eachother. Not the case at all. Seat of the pants N3CH#2 is much much crisper than N3EH#2 particularly at 1/4 throttle. Wonder if trying N3EH#1 would be worth while. I ran N3EG#1 for quite some time which was a bit rich off idle and ripped arms everywhere else.

[Bailey28]

Just by running the N3EH-1.5 vs the N3CH-2 alone they do line up and overlap exactly on my JD chart. It looks like the chart you bought doesn't like the N3 needles.

I have a later version, perhaps you could contact JD and see if you can get an update at no charge?

[Jakobi]

Thanks for that Bailey and yeah mines an older version.. I don't mind paying for the new copy from JD its just a pain that you pay electronically then have to wait to have it shipped to the states. I always consider buying it at the moment I need it. In a week from now I'll be back at not needing it Thanks for confirming that info!

[NSE.ONE]

Jak,
FYI

Scotty has recomended and given me a N1EF to try with my new engine setup.

I cant comment yet as still a few days from finishing it. Might help you though.