Generac NP-30G / NP-40G — Preparation for Storage

Maintenance · Engine

For the Generac NP-30G / NP-40G, from the Generac service manual.

Applies to: Generac NP-30G, Generac GN-190 / GN-220 engine, Generac GN-190 or GN-220 (see NOTE 2) engine, Generac GN-220 engine

Procedure

1. Start the engine and let it warm up, then shut it down.
2. If gasohol was used, turn off fuel supply and let engine run out of gas.
3. While warm, completely drain the oil, then refill with recommended oil.
4. Attach a tag to the engine indicating oil viscosity and classification.
5. Remove spark plug; pour about 1 ounce (15ml) clean engine oil into plug opening; crank several times; install and tighten plug.
6. Remove battery and store in a cool, dry room on a wooden board.
7. Clean and wipe the generator exterior surfaces.

Full service-parts list: Generac NP-30G →

Source: Generac service 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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