Honda Outboard Motor BF20 Owner's Manual page 19

Emergency Starting
If the recoil starter is not working properly, the engine can be started with
the spare starter rope in the tool kit.
1. Remove the engine cover.
2. Remove the recoil starter by removing the three 6 mm nuts.
3. Wind the spare rope clockwise around the pulley to start the engine.
CAUTION: Keep clear of moving parts.
4. Reinstall the engine cover.
CAUTION: Do not operate without the engine cover. Exposed moving
parts could cause injury and water may damage the engine.
ENGINE COVER