Rejetted 1984 Honda Nighthawk 700. -Lean Spot?
Posted: Tue Sep 16, 2008 4:20 pm
I added a custom built exhaust to my Nighthawk over the summer and am having trouble getting a little bog out at around 6-7000 rpm's. I thought my needles were set too lean so I moved the clip down a notch to richen things up but that worsened the problem. I went the other way with the clip and that was also worse as the bike had terrible acceleration. So now I'm thinking perhaps it is the main jet? The other thought I had was when I was reading the jetting instructions they said:
5. Locate the fuel mixture tab (Fig. B). Remove the float bowls and file
off the tab nearest to the screw on the float bowl. This will allow for easi-
er adjustment. Carefully turn the mixture screw clockwise until lightly
seated, then back out 2.5 turns.
This confused me because my tabs on my floats aren't adjustable and I don't know where the mixture screw is that they are referring to. So I didn't worry about it and assumed that my bike didn't have the screw.
Here are some pics of my carbs and one of the plugs after riding tonight between 6 and 7000rpms. The jet without anything in it on the far right is the main jet, directly to the left of that is the slow speed and then I was wondering if that pillar to the left of the slow jet was where the mixture screw was and they put a cap over it? A couple other things to consider is that my pipe is fairly black on the inside and I'm getting fairly poor fuel economy (34-36, when running it pretty hard) which would also lead me to believe that my jetting may be too rich. The side electrode on the plug is black/brown (indicating a rich mixture) but the plug is white around the center electrode (lean condition?) I guess I'm not sure which part of the plug I should read. Any help would be greatly appreciated as I'm a little bit stumped or maybe just confused right now.
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5. Locate the fuel mixture tab (Fig. B). Remove the float bowls and file
off the tab nearest to the screw on the float bowl. This will allow for easi-
er adjustment. Carefully turn the mixture screw clockwise until lightly
seated, then back out 2.5 turns.
This confused me because my tabs on my floats aren't adjustable and I don't know where the mixture screw is that they are referring to. So I didn't worry about it and assumed that my bike didn't have the screw.
Here are some pics of my carbs and one of the plugs after riding tonight between 6 and 7000rpms. The jet without anything in it on the far right is the main jet, directly to the left of that is the slow speed and then I was wondering if that pillar to the left of the slow jet was where the mixture screw was and they put a cap over it? A couple other things to consider is that my pipe is fairly black on the inside and I'm getting fairly poor fuel economy (34-36, when running it pretty hard) which would also lead me to believe that my jetting may be too rich. The side electrode on the plug is black/brown (indicating a rich mixture) but the plug is white around the center electrode (lean condition?) I guess I'm not sure which part of the plug I should read. Any help would be greatly appreciated as I'm a little bit stumped or maybe just confused right now.
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