To make my warranty stay valid, do I have to have the stealer check my valves at teh 600 mile service? I am sure I can change the oil, check everything else out on my own. Just not sure how to do the valves or what it involves. Basically, do I need the dealer receipt for 1st service for future reference? Havent had to on other bikes in the past, but thought guys who have been through it with the VTX will know more. Thanks.