One of the better kept carburetor secret is the Carter side draft used on the Nash Healey, Corvettes and Corvairs. They came is various sizes, I decided to use a big one, installing it on the Iron Headed 1725 in the '69 Fast back. I decided the carb designed as a performance upgrade for the the big Harely. was a wipeout. It is fine if your feeding a big aircooled engine that needs a consistent diet of rich fuel, especially off idle up to about 2500 rpm. The carb, while tunable, was strange. The low speed jet had no impact on idle or off-idle mixture. The idle adjustment and progression jets being the main controllers. The idle jets impact on the high teens and up. This meant the 1725 ran rich at low speed. It became clear I would need a carb that had a high speed enrichment circuit. Enter the Carter YH.
Here is my Ebay-sourced unit. Remanufactured and equipped for life in the Fast Back with the Iron Head 1725. Also a shot of the engine and manifolding. I have made stuff to mate the Alpine cables compatible with the Carter rod actuated controls.
Bill
Here is my Ebay-sourced unit. Remanufactured and equipped for life in the Fast Back with the Iron Head 1725. Also a shot of the engine and manifolding. I have made stuff to mate the Alpine cables compatible with the Carter rod actuated controls.
Bill
