On my 2000' ZX9R, which has a Muzzy Full Titanium Header on it, has been re-jetted with only the Main Jets increased in size. Stock being 160's on the outside carbs and 165 on the inside. I changed them to be 165 outside/170 inside. The bike is full of Power especially in the midrange and upper rpm's.
The question that I have is on the fuel/air mixture screws.
Kawasaki's Service Manual states that stock is set at 1 5/8 turns out on all (4), but the plugs are running white at that ratio. I turned them to 1 3/4 turns out, but they are still white.
I then cranked them to about 1 7/8 but still white.
I just turned them to about 1 15/16 and will have to check on it after a bit of riding. Last year when I set them to (2) complete turns out, I had flames coming out of the exhaust. That was with a k & N air filter, but I put that back to stock filter w/screen out.
I there another reason my plugs may be on the lighter side?
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Yup, it's a real fine line.... Mine is two turns, but at night on a no load rev, she'll shoot a little bit of flames also.. Put 4800 miles in the last 4 months that way, and no prob.. If I screw any less turns, she just doesn't run right. If I'm cranking on her driving, she won't shoot flames tho' ...
Also, if the plug is all ready burnt the ceramic.. you might try a new set of plugs, then redo your test a 1 15/16 ...??
Leader of the llama Patrol...Commander Llamatelyasomthin of P.W.I.
if you have a kn filter, full exhaust without a full jet kit, your going to run lean. eventhough you changed the main jets you still need to modify the pilot jets. spend the 100 bucks and get the kit and it will fix the problem.
I do understand that the pilot jets should also be replaced. but I also know it's not really easy to find Kehin Pilot jet's. I had a real hard time getting them for an earlier model Ninja a couple of years ago (but I was able to get them, for a price).
What I'm thinking is that the plugs I'm using are too cold? I'm not sure of the history of the bike, but the old plugs ran at a nice brown color last year even after re-jetting the main jets.
Does anyone know the difference between these (2) plug types.
When I bought the bike it came with CR9E plugs in it. The plugs also did not have the (2) electrodes on them, just (1).
Stock plugs are CR9EK with (2) electrodes on them. Are the CR9E plugs possibly a hotter plug?
I think I got the Hotter/Colder plug idea correct?
I also am running the Stock airbox with the screen removed, and not the K & N filter anymore. I had read that the K & N air filters actually make your bike run leaner. Not sure if that's correct, but that's just what I've seen on other forum's.
the only reason k/n filters cause a bike to run lean is b/c they allow more are into the air/fuel mixture, same with a high performance exhaust, thats why its recommended you rejet after modifiing anything with the air or fuel.