There are two main types of preventative maintenance: general mechanical service (to keep everything tip-top) and "winterising" for storage or extended periods of disuse (in hot or cold weather!)
How to service an outboard motor
Regular servicing of your outboard is an important part of keeping it running reliably. A bit of time spent checking it over in the workshop sure beats breaking down on the water.
How to winterise an outboard motor
Before an outboard motor is put away at the end of the season it is important to perform a few simple tasks to ensure that everything runs well when the weather warms up and you get ready to head back out on the water.
The ignition timing is not set correctly
On a four stroke outboard the timing belt connects the crankshaft to the camshaft to keep the valve timing in sync with the piston movement.