For a small engine your commandments are as follows. These are listed in order of importance; 1 & 2 are the most important, 3 is next:
- Drain or empty fuel at end of season. If using non-ethanol fuel if your model has a fuel shutoff draining/running the carburetor out should suffice.
- Use non-ethanol fuel if at all possible.
- Keep oil full. Check it before each use (okay, check it fairly often). Low oil is the #1 killer of motors.
- Follow break in oil change procedure, Even better change oil after initial use.
- Change oil and air filter at same time regularly/seasonally depending on use.
This is something I can claim enough experience on, while not a professional I have repaired more than I can number for friends and family not following the above.
I am impressed by the 90min to 40min time reduction.