ADULT PRO STOCK
Flat Kart Only
Weight: 375 lb
- Single cylinder OHV engines only. Clone or Predator 212. No Animal.
- Stock engine with a maximum displacement of 212 cc.
- Stock engine with a minimum combustion chamber of 26 cc to be checked with a CC nut.
- Stock cylinder head is required. No porting or polishing of the Intake/Exhaust runners. No visual alterations may be performed in the runners, bowl area, or around the valve guide. All head gaskets are legal.
- Stock crankshaft unaltered, 2.165” maximum stroke.
- Unaltered SFI-approved flywheel required.
- Any length connecting rod is legal. Billet aluminum is legal.
- Stock unaltered piston only (2.756” maximum).
- Stock camshaft cores only, ez-spin assembly must remain as stock. Max intake lift on cam .225"-min .215" lift taken at push rod. Max intake lift at the valve (.261" for Hemi/ .236" for Wedge Head) taken on the valve spring retainer with zero lash. Max exhaust lift on the cam .232"-min .222" lift taken at pushrod. Max exhaust lift at the valve (.267" for Hemi/ .243" for Wedge Head) taken on the valve spring retainer with zero lash.
- Stock rocker arms unaltered (Non-Hemi 1:1 ratio max, Hemi 1:1.1 ratio max).
- Stock lifters unaltered.
- Any push rods are legal.
- Stock valves and valve size for the make/model of the head. Stainless replacements OK but must remain stock size for that head. Reaming Valve guide to accept stainless valves also permitted.
- Valve Spring Installed Height Minimum .815 Maximum Spring Tension of 10.8 at a Height of .850 Max Wire Diameter Of .071”.
- Any retainers and keepers legal.
- Stock valve cover unaltered (You may install fuel pump port).
- Stock side cover unaltered. Pulse fitting OK.
- Any ignition coil is legal (wire and boot non-tech item).
- Exhaust: Any header (Must not extend past the rear bumper).
- Any Clutch.
- Stock appearing clone carburetor measuring a maximum .615 at the Venturi and .751” at the exit (Measured with ‘NO-GO’ gauge at the entry of the runner, plus a roundness check of Venturi. Ventura must be round. No odd shapes. (i.e. egg or ‘D’ shape). Choke may be removed. Any attempt to draw air past carb will be disqualified.
- Pump gas only baseline designated by track.
- Any air filter and/or adapter is legal.
- Aftermarket carburetor spacers and insulators are illegal.
- Electric starter and pull starters are legal.
- Removal of governor and/or governor components is legal (Plugging holes legal).
- Removal of oil sensor and/or oil sensor components is legal (Plugging holes legal).
- Flat kart body only.