Zenith 28 IFT 1-Barrel: Overhaul: Reassembly
- Inspect all parts for damage, clogged passages, or distortion. Replace all parts that are not acceptable. Replace all gaskets and seals.
- Slide choke shaft in place through carburetor cover, installing the two spacers as this is being done. Install choke plate on shaft between the two spacers. Peen threads of screws to prevent them from loosening. Install fast idle speed cam with its spring and hub, and the choke plate shaft lever. (Be sure lever arm is engaged in spring.) Install fast idle speed cam cover and secure with screw and lock washer. (Note the locating dowel diagonally opposite the screw.)
- Install choke piston in choke housing and install housing and gasket on carburetor cover. Install piston link on choke shaft and secure with lock washer and nut. In choke housing, install metal shield, thermostatic spring support block with its metal plate and the thermostatic spring.NOTE: Spring must engage pin on piston link, and tangs on metal ring properly positioned in the housing.
Install choke cover, making sure pin inside the cover fits in hole in thermostatic spring support block. Index mark on cover should be aligned with mark on housing.
- Install needle valve and seal. Slide throttle plate shaft with its end seal through bore in carburetor base. Install throttle plate in slot in shaft.NOTE: With carburetor base upside down, indentations in the plate should be over the screw holes, and indented away from the idle ports.
Hold plate in place with the two screws, but do not tighten screws at this time. Install bushing and throttle shaft arm on shaft and secure with lock washer and nut. Hold throttle firmly in closed position and tap throttle plate lightly to center it in bore. Tighten the two screws and peen threads to prevent them from loosening.
- Install connecting link between throttle shaft arm and fast idle speed adjustment arm.NOTE: Right angle bend is at throttle shaft arm, and obtuse angle bend is at fast idle speed adjustment arm.
Install fast idle speed adjustment screw and arm, using bolt and spring washer. Install idle mixture adjustment screw and spring. Turn screw in until it seats lightly, then back screw out about two turns, to provide preliminary setting. Install idle speed adjustment screw and spring, with throttle limiter, if applicable. Turn screw in until it just contacts throttle shaft arm tab when throttle is fully closed. Turn in an additional one-half turn to provide preliminary setting.
- Install main jet, main jet plug and seal, float, and plastic float bracket. Install cover gasket and cover. Make sure plastic float bracket is in place in the boss in the cover, and the choke plate shaft lever is in proper position with regard to the unloader tab on fast idle speed adjustment screw arm. Install idle jet, fuel filter screen, and its plug.