I've used SenTec hour meters on almost all of my marine, atv and yard equipment. They are really small and last forever. Just wrap the small sense wire around the spark plug wire and stick the hour meter where you can access it. I have them on my lawnmowers, boat motors, generators, atv. They can be purchased direct from SenTec, E-bay or Amazon for about $20 or less. I've always been surprised by the amount of hours I actually put on motors than I think I do (always more HRS than I thought). It helps me keep stay on top of my oil and maintenance schedules.