This is a spec class for 125cc air-cooled four stroke thumper pit-bike style motorcycles. All stock motorcycle components must be in place and unmodified unless stated below. 

3.15.1 Maximum 125cc single horizontal cylinder air cooled four stoke.

3.15.2 Carburetor modifications are restricted to changes in needle jet, pilot jet, and main jet only. Main jetting is not to exceed 25% of stock jetting.

3.15.3 Only OEM oversized piston sizes or equivalents are allowed

3.15.4 Only external gear changes are allowed.

3.15.5 Stock bodywork must be retained. Stock seat may be modified but must retain stock mounting points.

3.15.6 Aftermarket handlebars may be used but must retain stock mounting points and the grips must be above the level of the upper triple tree.

3.15.7 Modifications to stock air box are allowed

3.15.8 No suspension allowed other than the installation of spacers/tubing, springs and fork oil to stiffen the suspension. All the stock factory adjustments may be utilized.

3.15.9 Aftermarket DOT tires are allowed but the motorcycle must retain stock OEM hubs and rims. Slicks are not allowed.

3.15.10 Heavy duty spokes are allowed.

3.15.11 Only commercially available pump gas may be used. Additives for lubrication and knock suppression will be permitted provided they fall within CMA rules.