Hercules — Engine Storage
Maintenance
From a Hercules owner's manual — check it applies to your exact model before use.
Procedure
- Run engines that operated on leaded gasoline on unleaded or standard white gasoline for at least 10 minutes.
- Fill the crankcase to the 3/4 mark on the bayonet gauge with a rust-preventive engine oil such as Shell ENSIS 412 or Gulf No-Rust Engine Oil Grade 2.
- For extended idle periods, pour approximately 1 quart of this oil into the carburetor air intake while operating at fast idle (800 to 1000 RPM) until the motor stalls; shut off ignition.
- In damp or humid climates, seal off all openings with moisture-proof tape.
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.