The TC 250 isn't stock; a 300cc kit replaces the 250 piston and cylinder. At this point Cory doesn't modify the engine, but has plans on doing some porting and head work in the future. Switching to a Keihin carb was the single biggest improvement to the whole package according to Cory. He goes way leaner across the board for jetting so the motor is much more crisp. Between the carb and engine are Boyesen reeds. To further smooth out the power delivery Cory uses a Steahly flywheel weight and power leaves the motor through a Rekluse manual clutch. Gas is mixed at a 60:1 ratio with Motul oil. As Graffunder's major sponsor, SRT supplies a lot of the parts on Cory's bike, including the SRT pipe. An SRT muffler will be coming soon. The skid plate is an SXS skid plate. SRT sells sweet complete wheel sets and that is what is on Cory's bike and the color is cool looking.