Change the oil before storage, not in spring

Used oil holds acids, water and fuel combustion byproducts. If the bike sits on it all winter, they keep working inside the engine.

• Warm the engine for a few minutes: warm oil drains better and carries suspended contamination out with it.
• Shut the engine off, drain the old oil completely and replace the oil filter.
• Check the owner's manual for oil type and quantity, fill with fresh oil and verify the level in the sight glass or on the dipstick.
• Run the engine for a minute or two, shut it off and check the level again, plus the drain plug and filter for leaks.
• After that, avoid unnecessary rides: the goal is to put the bike away with a clean engine.