Choke and Hoses

Check the choke mechanism and vacuum breaks for proper operation at recommended maintenance intervals.

1. Remove the air cleaner. With the engine off, hold the throttle half open. Open and close the choke several times. Be sure all links are connected, and are not damaged.
2. If choke or linkage binds or is sluggish, clean them with choke cleaner.
3. Inspect all carburetor vacuum hoses for proper connections, cracks, cuts, hardness, or other signs of deterioration. Replace or correct as necessary.


VACUUM BREAK CHECKING PROCEDURE

1. If the vacuum break has an air bleed hole, plug it during this checking procedure.
2. Use hand held vacuum pump or equivalent, to apply 15 in. Hg. vacuum to the vacuum break.
a. The vacuum break plunger should retract fully within ten seconds. Apply finger pressure to see if the plunger has moved through its full travel. If it fails to retract within ten seconds or if it fails to move through full travel, replace the vacuum break assembly.
b. The vacuum break diaphragm should hold vacuum for at least twenty seconds. If it does not, replace the vacuum break.


ELECTRIC CHOKE CHECKING PROCEDURE

1. Allow the choke to cool so that when the throttle is opened slightly, the choke valve closes fully.
a. Ambient temperature should be 60~ - 80~ F (15~ - 27~ C).
2. Start the engine and find the time that the choke valve takes to open fully. Start timing when the engine starts.
3. If the choke fails to open fully within five minutes, check the voltage at the choke heater connection with the engine running.
a. If approximately 12-15 volts, replace the electric choke assembly.
b. If low or zero, check all connections and wires. Repair wires or replace fuses as required