Hercules — Cold Weather Starting
Operation · engine
From a Hercules owner's manual — check it applies to your exact model before use.
Procedure
- Correct late ignition timing causes hard starting; magneto impulse coupling should click on or slightly after top dead center.
- Never attempt to start with a wide-open throttle; have throttle open not more than one-fifth of total opening.
- Close the carburetor choke and turn the engine several times before the ignition switch is closed if hand cranked.
- Close the ignition switch and keep the choke closed nearly all the way, then crank the engine.
- Keep the choke partially closed until the engine warms up sufficiently to run normally.
- Fill the cooling system with hot water to assist starting; use thin oil such as 10W or 20W.
- If the engine has been standing idle for several days, remove the spark plugs and dry out; pour a tablespoon of oil in each spark plug hole.
Source: Hercules owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.