Below is a preliminary breakdown of the class structure. The structure is designed to provide a variety of bike types and sizes a competitive class to compete. There are both stock and superbike classes. Bikes maybe entered in the primary class designed for the displacement, type, and wheel size. Additionally, the bike can be entered in the next class up (bump up a class). This is allowed so that a single bike can be run in multiple classes per weekend. Examples are listed at the bottom of the post. Please review and feel free to ask questions. Look forward to seeing what everyone will be riding... · Kids Novice 	Up to 125cc air cooled, vertical cylinder four stroke 	Up to 110cc air cooled, horizontal cylinder four stroke 	Up to 50cc air cooled and water cooled two stroke 	Engines must remain stock using all OEM parts. This includes airbox, ignition, carburetor, and exhaust. 	Allowable changes are wheel sizes, tires, jetting, gearing, and controls. 	Suspension components must remain OEM. Springs, fluid, and internal modifications are allowed. 	OEM Brake components must be used. Brake pads can be changed. 	If the modification is not explicitly stated as allowable then it is illegal. 	Example of Eligible Bikes: 		Yamaha: PW50, TTR50, TTR125 		Honda: CRF50, CRF70, CRF/XR 100, CRF110, CRF125 		Kawasaki: KLX110, KLX125 		Suzuki: DRZ50, DRZ110 		KTM, Husqvarna, and Cobra: 50cc 2 stroke models 		Ohvale: GP-O 110, Manual and Automatic models 		Bucci: BR10 110, Manual and Automatic models 	- Kids novice riders will be moved to expert classes at the discretion of the SEMRA Officials. · Kids Expert 	Up to 73cc air cooled or water cooled, two stroke, 	Up to 125cc air cooled, horizontal cylinder four stroke. 	Up to 150cc air cooled, vertical cylinder four stroke 	Ohvale GP-O 160 and Bucci BR10 160 are allowed in stock configuration 	Example of Eligible Bikes 		Yamaha: YZ65, TTR125 		Honda: XR100, CRF100, CRF110, CRF125 		Kawasaki: KX65, KLX110, KLX125, KLX140 		Suzuki: RM65, DRZ125 		KTM, Huqvarna, and Cobra: 50cc & 65cc 2 stroke models 		Ohvale: GP-O 110 & 160, Manual and Automatic models 		Bucci: BR10/12 110 & 160, Manual and Automatic models 	With approval from SEMRA officials, Kids expert riders with appropriate machines can ride in adult classes that 				 			 the bikes are legal for with SEMRA approval. Kids Expert riders cannot run in novice classes. · Adult Novice 	Ages 14 and up. Any SEMRA legal mini may compete in this class. When a competitor's times AND SKILL level 						approach the times being turned in the main classes, they will be moved. The rule of thumb will be 110% of main event lap times. 	Adult Novice riders are not eligible to enter other classes. · Stock 100/125 Lightweight 	Stock 100/125, vertical cylinder air cooled 4 strokes 	Eligible bikes allowed using either stock wheels or 16” wheels running DOT tires. 		Honda XR100, CRF100, CRF125 		Yamaha TTR125 		Kawasaki KLX125 		Suzuki DRZ125 		Honda Grom is allowed using the stock 12” wheels running DOT tires. 		Kawasaki Z125 Pro is allowed using the stock 12” wheels running DOT tires. 	Engines must remain stock using all OEM parts. This includes airbox, ignition, carburetor, and exhaust. 	Allowable changes are tires, jetting, gearing, and controls. 	Suspension components must remain OEM. Springs, fluid, and internal modifications are allowed. 	OEM Brake components must be used. Brake pads can be changed. 	If the modification is not explicitly stated as allowable then it is illegal. 	Riders of any weight · Stock 100/125 Heavyweight 	Stock 100/125 , vertical cylinder air cooled 4 strokes 4 strokes 	Eligible bikes allowed using either stock wheels or 16” wheels running DOT tires. 		Honda XR100, CRF100, CRF125 		Yamaha TTR125 		Kawasaki KLX125 		Suzuki DRZ125 	Honda Grom is allowed using the stock 12” wheels running DOT tires. 	Kawasaki Z125 Pro is allowed using the stock 12” wheels running DOT tires. 	Engines must remain stock using all OEM parts. This includes airbox, ignition, carburetor, and exhaust. 	Allowable changes are tires, jetting, gearing, and controls. 	Suspension components must remain OEM. Springs, fluid, and internal modifications are allowed. 	OEM Brake components must be used. Brake pads can be changed. 	If the modification is not explicitly stated as allowable then it is illegal. 	Rider and gear weighing a minimum of 185lbs · Formula 2 	Up to 65cc two strokes 	Up to 125cc air cooled, horizontal cylinder four strokes 	Up to 150cc air cooled, vertical cylinder four strokes 	Superbike rules: Bikes may have unlimited engine mods but must not exceed max displacement. · Formula 3 	Up to 73cc two strokes 	Up to 160cc air cooled, horizontal cylinder four strokes 	Up to 180cc air cooled, vertical cylinder four strokes 	Superbike rules: Bikes may have unlimited engine mods but must not exceed max displacement. · Formula 4 	Dirt bike based framed only, no GP style bikes allowed. 	Wheel size 12” to 17” 	Up to 105cc two stroke 	Up to 150cc water cooled four stroke 	Up to 190cc air cooled four stroke 	Superbike rules: Bikes may have unlimited engine mods, but must not exceed max displacement · Unlimited GP 	GP style bikes only with 10” or 12” wheels 	Up to 105cc two stroke 	Up to 150cc water cooled four stroke 	Up to 190cc air cooled four stroke 	Superbike rules: Bikes may have unlimited engine mods, but must not exceed max displacement · SuperMini 	Any style chassis, 10” to 17” wheels 	Up to 112cc two stroke 	Up to 170cc water cooled four stroke 	Up to 190cc air cooled four stroke 	Superbike rules: Bikes may have unlimited engine mods, but must not exceed max displacement · Supermoto 	Full size dirt bikes only, no mini eligible bikes allowed. 	250cc to 525cc, 2 stroke or 4 stroke engines 	Dirt bike chassis with any wheels size greater than 16” 	Superbike rules: Bikes may have unlimited engine mods, but must not exceed max displacement Example of "Bump Up" classes: Example 1: KX65 – Primary class is Formula 2 (max 2 stroke displacement of 65cc). The bump up class would be Formula 3. Example 2: Stock TTR125 or CRF100 – Primary class would be Stock 100/125 (both LW and HW). The bump up class would be Formula 2. Example 3: YZ85 or CRF150R – Primary class would be Formula 4. The bump up class would be Supermini. Example 4: Ohvale GP-O 190 – Primary class would be Unlimited GP. The bump up class would be Supermini.
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