I picked up a 05' KX100 never been on the track let alone raced. $1900 Now what mods do you people have on your KX100? I Ride all trails by the way I'm thinking Steahly FWW (10 oz. ?) Then I need a spark arrestor right? So what silencer has a spark arrestor built in. Then I know some people changed the gearing. What did you change it to and what sprockets did you use? How many people found it neccessary to add a larger tank... although I don't ride too far from the car... so maybe I don't need one? (The tank wouldn't be first on my list as all i can afford are sprockets a FWW and a silencer now) Thanks.