Thanks guys, I have timers for my freeflight model airplanes. Also a logbook makes sense to keep different engines and burn rates noted....I have been told as I get older, memory is the Second thing to go.....I can not seem to recall what the first thing was 
I know that probably seems a bit anal, but it just works well for me to make notes etc it doesn't take long to do and I actually enjoy it and its interesting to look back and see how many hours you've put on an engine since you've owned it.