I have a 2003 Vulcan classic 800 with 12.700 miles and i have a lifter noise , i have just bought the bike last Feb, it had sat for a bit at the dealership, after i put on my 500 miles and my warranty expired and when i pulled up to a stop light i and i heard the lifters clicking and had back fire issues at low speed and no problem at high speeds, i have ran a couple of cans of sea foam and have gotten the back-firing to stop but still hear the lifters. Any Ideas?