NC30 jetting

[krisztian_andre]

From the state of my plugs, am I running lean, is it burning oil?

This is after riding the bike hard, then doing 14000rpm in a straigt, cutting ignition and pulling the clutch. The last few photos are from the front cylinder, the rest are from the rear:
https://plus.google.com/photos/11203432 ... gImq9J2gLg

Current setup is 118 rear, 115 front, full tyga exhaust with a short stainless oval can, K&N modded filter. Plugs done 4000km, engine 80000.

I'm having ocasional misfires(either caused by a faulty ignition system or oil on plugs I think) and there is a large flat band from 4500 to 7000 rpm.

I hope you can access the photos.

[Neosophist]

Perhps a tad lean but wsnt your intake non standard

[krisztian_andre]

apart from the k&n filter and the tyga system it's standard

[krisztian_andre]

apart from the k&n filter and the tyga system it's standard

[Cammo]

Running standard jets with a full system and aftermarket system won't be great. On their website Tyga recommend somewhere around 120/122 jets with their system.

The midrange flatspot will be caused by the k&n filter. Swap it for a standard honda filter for best rideability.

[krisztian_andre]

From what I read high humidity and high temoerature requires a leaner jetting. I'll try 118/120. What shoould I set the pilot screw to?

I bought 1mm washers, should I fit them?

[Cammo]

Check out the V4 jetting guide in the docs section. It answers each of your queries in this thread, and was put together for just that purpose:

http://www.400greybike.com/docs.htm