I just installed a new electronic hour meter on my bike. It is much like the ones sold by DR. D. and others. It is a pretty slick little unit and I picked it up for quite cheap at a Industrial/small engine shop. It is sold by Briggs & Stratton and I paid $16.99 Can for it. It works by wrapping a wire around the coil wire and it runs when it picks up the magnetic field. It seemed like a good deal to me as I have seen other brands of these meters for bikes that sell for $35 to $45 USD and they are pretty much identical except for the logo. Anyway, the big question I have is how many hours should I use for my engine oil maintenace? I usually change my oil at about 500Km with synthetic but I am not sure what that works out to for hours.I generally just ride medium to hard core trails at an expert level, no racing. The meter has a reminder at 25hr increments so I figured that might be close but maybe on the long side of things. Any comments or suggestions would be appreciated.