Generac NP-50G — Prepare Generator for Storage

Maintenance

For the Generac NP-50G, from the Generac owner's manual.

Applies to: Generac NP-50G, Generac GN-410 engine

Procedure

1. Start the engine and let it warm up.
2. Close the fuel shutoff valve in the fuel supply line and let the engine run out of fuel.
3. While the engine is still warm, drain the oil completely.
4. Refill crankcase with SAE 10W30 oil having API Classification 'For Service SF'.
5. Attach a tag to the engine indicating the viscosity and classification of the oil in the crankcase.
6. Remove spark plug and pour about two or three tablespoons of clean, fresh engine oil into spark plug threaded opening.
7. Crank engine several times to distribute oil, then install and tighten spark plug.
8. Remove the battery and store in a cool, dry room on a wooden board; never store on concrete or earth floors.
9. Clean and wipe the entire generator.

Full service-parts list: Generac NP-50G →

Source: Generac 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.

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