Carb issues

[B Murphy]

Has anyone here tried out this on an Amal what Dave on the B50 forum has done i.e. filing a small window on the slide (see below).


Re: Truckle slide
Post  by David Taylor » Wed Nov 07, 2018 6:00 pm

Here's an update. Amal concentric.
If you have poor throttling just off the idle with fluffing and stalling and fussy low rpm behaviour then it can be improved very simply by filing a depression in the bottom of the slide with the same radius as the carb venturi. The optimum depth is somewhere around 1.75 mm. Idle will be more stable and pickup from idle will not fluff or stall.
The riding experience is greatly improved. Before I made this change I was thrashing the bike to the red line and riding in low gears to keep the revs up because low throttle low rpm was so wheezy and fussy. Now I can truckle around at 30mph in top gear with a nice soft feel to the throttle. The bike feels more powerful right through the rev range.
Starting is easier because it can run reliably with the throttle just slightly open.