When does the digital hour meter run? On startup, or when the engine is idled up? My friends SZ Kaw. has the digital meter and he says he was putting 300 hrs a year on his old mower but his hustler only has 160 so far this year. He says the hourglass does not always turn on the meter. On cold startup it does not move, when he idles up it starts and will run all day after that on startup, even idle. Any info on meter used?