The forged alloy throttle slide features a hard anodised finish, allowing for less friction within the mixing chamber and increased wear resistance compared to the original zinc alloy throttle valve. The genuine Amal slide is precision manufactured in the UK.
Series 600 or 900:
- Hard anodized throttle slide from Amal as fitted to Amal 600 and 900 Premier series of carburetors. Â
Cutaway:
- The genuine Amal 3.0 cutaway throttle slide is precision manufactured in the UK. The amount of throttle slide cutaway is designated in 1/16″ for each full increment. Ordinarily, the 3.0 cutaway is specified for twin cylinder engines with dual carburetor cylinder heads, such as the BSA Lightning, Norton Commando, and Triumph T100R, T120 and T140 Bonneville models.
- The genuine Amal 3.5 cutaway throttle slide is precision manufactured in the UK. Ordinarily, the 3.5 cutaway is specified for bigger displacement single cylinder and twin cylinder engines with a single carburetor cylinder head. The Norton 850 Commando with 932 carbs is an exception as it was originally specified with 3.5 cutaway throttle slides due to its breathing characteristics.
- The genuine Amal 4.0 cutaway in the 600 series was used on the Triumph T100C from 1969 onward.
The slide not only is used for fine tuning low throttle positions, but also houses the jet needle, lifting it out of the needle jet when the throttle is opened. The lower the number of the cutaway indicates a smaller cutaway and will give a richer fuel charge at off-idle throttle position, up to approximately 1/4 throttle, when the needle position within the needle jet has a greater influence on the fuel mixture as engine speed increases.
The top cap must be removed from the carburetor’s mixing chamber and the throttle slide assembly withdrawn. The slide return spring must be compressed to allow the needle and throttle cable to be removed. Once the slide has been refitted, the carburetor will require adjustment to optimize performance.Â
For more Amal spares, click here.
