Alternative carb needle springs?
I'm trying to sort out some low-rpm lumpiness on my Bonneville post-ARK and want to try some less strong carb needle springs in an effort to allow the needle to come in to play easier/ quicker. This follows numerous attempts to play around with the pilot mixture and a suggestion from a mate on the site.
Basically at 1/8-1/4 throttle and 2-3000 rpm there's a real lack of smoothness e.g. 30 mph, 3-4 gear, 2-3000rpm = lumpy. Feels like I'm going over a bumpy road (when I'm not). I guess it's right in where the pilots taper off their influence and the needle starts to come in. Have tried 1 and 2 shims - no good. Have tried various adjustments leaner and richer on the pilots - no good. Have tried going up or down on the main jets - no good. So, my last port of call is the needle spring.
Any suggestions welcome (please be specific on the springs so I can find and order them on the net).
All the best.
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