heres the story i just got a 94 vmax 600. It ran good at first for about 50 miles or so i could get 80 in my feild but now it only goes 50 it bascily stops at 7000 rpm and stay there no matter how long u hold WOT down the feild it didnt used to do that at first and if it did it shifted or something so i looked at the plugs they were very oily b9es is what was in so i replaced them with br8es but it didnt help by the way it always starts amazing hot or cold i never complained about starting i could get it in about 1 or 2 pulls cold 1 pull hot i keep all the fluids full im stumped it still starts up good and runs good just not when i wanna go fast well not compared to how it was before it all started that i noticed after (i think) i was pulling my younger brothers on a sled under 10mph on stock gearing so i thought i fouled a plug but then i tryed changed them didnt help so i know its not the plugs what else can it be it only has 1500 miles on the sled so im not sure whats wrong it used to idle like at 500 after i changed the plugs it idles at 1000 which i prefer the br8es made it start even better i havent checked the plug color yet but what ideas do you guys have here what do i need to check this is my first sled i can work on 2 stroke dirtbikes so i can work on things so please help give me ideas to try thanks for all the help guys