have a stock apex and it has 5700 clicks...mostly boondocking on it..and now seem to lose 1 or 2 plugs when run hard..i thought we didnt have to change plugs..lol..but would just like to know so the dealer does not screw me...i had my key ignition changed.it was rusty..would not start...and wondering if there is something else more than just the plugs..the machine is a 2006 ..and the warrenty is over this year..thanks guys.. dont forget..its a stock...so the throttle is always open..