Could someone enlighten me please: there are two screws with locknuts - what are they for? Thanks. Phil (novice)
They are for setting a resistance to your throttle bit like a brake to make it so you have to turn the throttle off as well as on . I never use them as I like the throttle to snap back when I let it go .
Useful if you use hand signals...
Best wishes...
If it looks like the twistgrip on the right in the photo then the bottom screw and lock nut is to adjust the friction on the control and the upper one is a positive stop, on full throttle the twistgrip rotor stops on the screw to prevent strain in the cable nipples which could cause cable failure.
Photo from 1964 Amal catalogue.
Yes it looks like that. Thanks very much.