whitestu
|
| posted on 2/8/08 at 08:31 PM |
|
|
Bike Carb Mixture
I think by the look of my plugs I'm running a bit rich [ZX6R carbs, 1.6mm mains, needle on the second notch].
To lean it off should I go for smaller jets, or will dropping the needle down a notch lean off as well?
Stu
|
|
|
|
|
David Jenkins
|
| posted on 2/8/08 at 08:37 PM |
|
|
There are several settings to think about, done in this order:
1. WOT - wide-open throttle. This is controlled by the main jet, and has to be set first.
2. 1/4 to 3/4 throttle. Set by the needle, usually by position up or down, occasionally by replacing it with a different length and/or taper.
3. Almost closed throttle. Set by the pilot screw.
I'm using 1.3mm mains on CBR600 carbs, with a 1660cc motor. The mixture is correct for WOT and tick-over, but rich on the middle bit - but
unfortunately I have fixed-length needles. 
HTH,
David
|
|
|
roadrunner
|
| posted on 2/8/08 at 09:37 PM |
|
|
David, you can always put a washer under the head of the needle.
|
|
|
David Jenkins
|
| posted on 2/8/08 at 10:11 PM |
|
|
Mine needs to go down, not up! 
|
|
|
roadrunner
|
| posted on 2/8/08 at 10:17 PM |
|
|
I did think about that afterwards.
|
|
|
BenB
|
| posted on 2/8/08 at 10:30 PM |
|
|
Yup. A washer under the needle works well. Let me know if you fancy borrowing a colortune... Worked well for me (that and a wideband lambda sensor 
)!!!!
|
|
|
