I Love microskiff.com!
Add your trailer tires to the list!While I should be more diligent in tracking the engine hours, I typically use the calendar for most services. Every spring (before it gets unbearably hot in the garage) I change the engine oil and fuel filter. I added the Racor S3213 fuel filter with stainless bracket and plastic see through bowl when I purchased the boat and mounted it below deck in front of the motor so relatively easy to get to for change out. Have seen very little debris in the bowl and have been running corn juice during my ownership. I also examine the small fuel filter under the cowl and change that out if it starts getting dark in color (usually every 3 or 4 years). I change the gear oil every two years (regardless of engine hours).
I probably change plugs every three years or sooner if I don't believe the engine is starting quickly or losing any performance.
I use my water pressure gauge to determine when it is time to change the impeller. If I see a consistent drop in pressure (5 lbs or more), then it is time.
I know this is probably another discussion but I am starting to pay more attention to the life of the batteries. I run two Optima Blue Tops (starting/house and 12V trolling motor) which have never let me down but thinking that I should go ahead and replace them at the 5 year mark.
And I do have a small notebook where I write down all services, dates, engine hours, quantities, brands, and part numbers as well as keeping a maintenance guide taped in the inside cover.