The 900 Series AMAL Carburetor has been re-designed to improve performance and wear. The new carburetor incorporates changes in materials which reduce the rate of slide and body wear and a precision engineered idle circuit which improves the pick up performance from idle and reduces fuel consumption. The precision manufactured forged alloy, hard anodized throttle slide has a low friction surface for smoother operation and greater wear resistance. The material of the carburetor body has a "passivated" finish which resists corrosion, while the ethanol resistant, puncture proof StayUp float and viton tipped alloy needle valve improve control of the fuel flow.
These come equipped with a 200 main jet, .106 needle and a #3 slide, although for a single carb application you will need to change this out for a #3.5 slide and a 230 main jet.
A new easily removable pilot jet provides precise metering of the idle circuit. The jet, which is located in the opposite position to the pilot air screw, is manufactured to tight tolerances allowing it to be replaced with minimum disruption to the adjustment of the carburetor. The size of the jet replicates the 622/107 pilot bush. Removal of the jet allows access to the rest of the idle circuit for servicing. The new jet cannot be fitted to earlier versions of the Mk1 Concentric.
For your reference, a right side carb has the tickler on the right side of the carb body, left side carb the tickler is on the left.