Single cylinder OHV engines only. Clone or Predator 212.
Modified engine with a maximum displacement of 212cc.
Stock engine with a minimum combustion chamber of 24 cc 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 piston unaltered only (2.766” maximum). Piston must be a cast stock flat top or dished configuration.
Any camshaft and rocker arms are legal with a maximum total lift configuration of .342” measured at the valve.
Any lifters are legal.
Any push rods are legal.
Stock valve size for that head may use either stock or stainless-steel valves.
Any single coil valve springs are legal.
Any retainers and keepers are legal.
Any valve cover (Spacers are legal).
Any side cover is legal.
Any ignition system is legal.
Any exhaust is legal.
All clutches are legal.
M1 Methanol only or equivalent top lube OK. No performance enhancing additives.
Stock appearing clone carb only, no external epoxy may be used. Choke may be removed from carb. Carburetor must remain in stock configuration and appearance externally. Spacer blocks between the carburetor and cylinder head are allowed. No adapters may be used.
Any air filter and/or adapter is legal.
Fuel tank must be relocated and a pulse fuel pump installed.
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).
Electric starter and pull starters are legal.
No welding or addition of material of any kind (i.e. epoxy) to the head, side cover, or block.