Yamaha — Storage - Drain the Fuel
Maintenance · Fuel system
From a Yamaha owner's manual covering: EF1600, EF2600, YG2600. Check it applies to your exact model before use.
Procedure
- Drain the fuel tank, fuel cock, and carburetor float bowl.
- Pour a cup of SAE 10W30 or 20W40 motor oil into the tank.
- Shake the tank to coat the inner surfaces thoroughly.
- Drain off the excess oil.
Source: Yamaha 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.