i think its time for me to do some maintance on my exmark. i got my exmark as a demo unit and had the dealer service the machine for me. however that was roughly 50 hrs ago. i was wondering what all i should do to service it. also another question about it. when i am mowing and backup suddenly the engine acts like it will shut off but it hasn't shut off yet it just gets really close. but if i slowly back up it won't do it as much or its much less likely to. thanks again for the help and info.