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Classes

Note: The following information has been updated for the 2017 Racing Season.

All riders' ages are as of the day of the race. Any rider under the age of 18 must have his/her entry form signed by his/her parent or legal guardian.

The rider must be of adequate size and maturity to keep his/her machine under control at all times. This includes riding, stopping, starting, standing still, mounting, and dismounting the machine.

Riders under the age of 12 are limited to riding machines of less than 120cc displacement for two-stroke and less than 160cc displacement for four-stroke. All riders on machines of larger than 250cc displacement before overbore must be of at least 14 years of age regardless of the class. Other age restrictions apply as listed for specific classes. Unless specifically mentioned for an amateur class, current professionals may not run in any amateur or vintage classes.

A front brake is not allowed unless specifically mentioned for a class. All motorcycles must have a functional and effective rear brake unless a specific brakeless class is created for the event.

All fuel must be either pump gasoline or commercially available racing gasoline. For 2-stroke engines the addition of lubricating oil to the fuel is allowed. Methanol (methyl alcohol) is not allowed.

The motorcycle on which a rider starts a heat race is the motorcycle on which that rider must run in all races in that class at that event. Switching motorcycles is allowed but the rider will be required to start on the penalty row. Substitute riders are not allowed.

Unless noted, knobby tires will not be allowed.


Youth MX Charger
This class is for true beginner riders with minimal or no flat track motorcycle racing experience, front brake and knobby tires are permitted. SEMDTRA will monitor this class for progression of speed and encourage parents to promote as needed. Allowed engine displacement is 65 -85 cc 2 stroke and 70cc to 150cc 4 stroke. No points will be awarded for this class. Riders between the ages of 7 and 15 are allowed to ride in this class. The entry fee for this class is $5.00 per race for members and $10.00 for non-SEMDTRA members.

50cc 2 Stroke
Riders are allowed up though the age of 8 years. Approved models include Yamaha PW50, Suzuki JR50, Cobra 50, LEM 50, Polini 50, KTM 50, Husqvarna 50. Other 50cc 2 stroke bikes may be allowed at the discretion of the referee. A front brake and knobby tires are permitted. The entry fee for this class is $5.00 per race for members and $10.00 for non-SEMDTRA members.

50cc 4 Stroke
Riders are allowed up though the age of 8 years. Approved models include Honda XR/CRF50 and Yamaha TTR50. Other 50cc 4 stroke bikes may be allowed at the discretion of the referee. A front brake and knobby tires are permitted. The entry fee for this class is $5.00 per race for members and $10.00 for non-SEMDTRA members.

65cc 2 stroke
Riders are allowed up through the age of 11. Engine, frame, and suspension modifications are allowed. The entry fee for this class is $15.00 per race for members and $20.00 for non-SEMDTRA members.

85cc 2 stroke
Riders are allowed up through the age of 15. Engine, frame, and suspension modifications are allowed. Maximum rim diameter is 17". The entry fee for this class is $15.00 per race for members and $20.00 for non-SEMDTRA members.

70-125cc
70-125cc 4 stroke bikes and 2 stroke play bikes such as (Yamaha PW-80 and Suzuki DS-80 are allowed) 2 stroke racing bikes are not allowed in this class. (Bikes must be air-cooled) Riders are allowed up through the age of 15. Engines may be modified or changed as long as replaced with the same style engine (i.e. CRF 70 engine replaced with Chinese built pit bike engine). Frame and suspension modifications are allowed. Minimum rim diameter is 10". The entry fee for this class is $15.00 per race for members and $20.00 for non-SEMDTRA members.

0-200cc
Riders must be at least 9 years of age to ride this class. The engine may be either a 2-stroke or 4-stroke configuration. Engine, frame, and suspension modifications are allowed. Minimum rim diameter is 16". The entry fee for this class is $25.00 per race for members and $30.00 for non-SEMDTRA members.

Youth Open
This class is designed as a stepping stone for Youth riders to continue racing with other Youth before moving on to an adult class. Riders between the ages of 9 and 15 are allowed to ride in this class. Any bike up to 250 cc 2 stroke or 4 stroke. Riders must be 12 years of age or older to ride a 250cc in this class. Must have at least 4 bike participation at each event for this class to be offered and to earn points. The entry fee for this class is $15.00 per race for members and $20.00 for non-SEMDTRA members.

MX Open
Any full size motorcycle originally sold new as motocross, enduro, or dual sport bike with stock style frame and suspension may be used. Must use stock narrow style front wheel. A front brake is allowed. Knobby tires are permitted. Any displacement is allowed. Minimum rim diameter is 17". The entry fee for this class is $15.00 per race for members and $20.00 for non-SEMDTRA members.

Charger
Motorcycles of any model year and of at least 125cc displacement are allowed. The minimum rim diameter is 17". This class is for riders who are new to flat track racing or are not up to speed with other classes. After three wins or demonstration of capabilities well above those of the other riders a rider may no longer be eligible to compete in this class. Such judgment will be made by SEMDTRA officials in the interests of safety (riders of similar speeds) and fairness (similar riding ability levels). This is a non points paying class. Riders must be at least 16 years of age to ride in this class. The entry fee for this class is $25.00 per race for members and $30.00 for non-SEMDTRA members.

Open Amateur
Motorcycles of any age and of at least 125cc displacement are allowed. The minimum rim diameter is 17". This class is not open to current professionals. Riders must be at least 14 years of age or older to ride a motorcycle larger than 250cc in this class. Minimum age to ride this class is 12. The entry fee for this class is $25.00 per race for members and $30.00 for non-SEMDTRA members.

Pro-Am
The intent of this class is to allow the faster experienced amateur riders the chance to compete with the professionals. Riders must be at least 14 years of age. The minimum wheel size is 17". Engine must be single cylinder configuration and the minimum engine displacement is 250cc. There is no upper limit on engine displacement. Engine, frame, and suspension modifications are allowed. Specialized flat track racing frames are allowed. Engines may be of either 2-stroke or 4-stroke configuration. The entry fee for this class is $40.00 per race for members and $45.00 for non-SEMDTRA members. 100% payback in this class; payout sheet will be posted prior to the start of the race.

Open Pro
All riders must be at least 16 years of age. The minimum wheel size is 17". The engine must be single cylinder configuration and the minimum engine displacement is 250cc. There is no upper limit on engine displacement. Engine, frame, and suspension modifications are allowed. Specialized flat track racing frames are allowed. Engines may be of either 2-stroke or 4-stroke configuration. Twin cylinder motorcycles are allowed to run this class at short track events when Open Pro Twins class is not offered. Once you race in the Open Pro class you are no longer eligible to run Vintage or Amateur classes in the same season. The entry fee for this class is $40.00 per race for members and $45.00 for non-SEMDTRA members. 100% payback in this class; payout sheet will be posted prior to the start of the race.

Open Pro Twins
This class is run only at selected events on larger tracks. All riders must be at least 16 years of age. The minimum wheel size is 17". The engine must be twin cylinder configuration. There is no limit on engine displacement. Engine, frame, and suspension modifications are allowed. Specialized flat track racing frames are allowed. Engine must be 4-stroke configuration. This is a non points paying class. Open Pro Twins riders are not permitted to run any Amateur classes. The entry fee for this class is $40.00 per race for members and $45.00 for non-SEMDTRA members. 100% payback in this class; payout sheet will be posted prior to the start of the race.

Senior 40 plus
Riders must be at least 40 years of age. The minimum engine displacement is 201cc. The entry fee for this class is $25.00 per race for members and $30.00 for non-SEMDTRA members.

Vintage 250cc
Motorcycles must be from 1981 or earlier, air cooled, have two rear shocks, and can be of either 2-stroke or 4-stroke configuration. The engine (crankcases, crankshaft, cylinder, and cylinder head) must have originally been of 250cc or less displacement. Engine displacement changes are allowed. Rims must be of a minimum diameter of 17". The maximum number of cylinders allowed is 2. Specialized flat track racing frames are allowed. A rear brake is required. Riders must be at least 14 years of age to ride this class. The entry fee for this class is $25.00 per race for members and $30.00 for non-SEMDTRA members.

Vintage Open
Motorcycles must be from 1981 model year or earlier, air cooled, have two rear shocks, and can be of either 2-stroke or 4-stroke configuration. Rims must be of a minimum diameter of 17". Multi-cylinder engines are allowed. Specialized flat track racing frames are allowed. A rear brake is required. Riders must be of at least 14 years of age to ride this class. Note: Honda RFVC and Rotax 4-stroke engines were introduced after 1981 and are not allowed in this class. (Air Cooled 2 stroke engines newer than 1981 are allowed ie. CR480/500 up to 1984, YZ 465/490 up to 1989, RM 465/500 up to 1983, KX 450/500 up to 1984) The entry fee for this class is $25.00 per race for members and $30.00 for non-SEMDTRA members.

Mad Dog Stock
This class is intended to be a fun class with very close racing. Riders must be at least 14 years of age. Current professional riders are allowed. This class is based on the CRF100 and XR100 motorcycles only. Engine modifications are not allowed. Any tires may be used. Wheel assemblies must be stock. The air filter element, handlebars, sprockets, and rear spring may be changed. The stock air box must remain in place, lid may be removed. The front forks cannot be mechanically altered or replaced except for springs and oil. Frame modifications are not allowed. Carburetor must be stock. (jetting changes are allowed) The stock exhaust (pipe) system must be used, end cap may be removed. All bikes will be impounded after every race for post race inspection. Nobody will be allowed in impound area except referee. The entry fee for this class is $15.00 per race for members and $20.00 for non-SEMDTRA members.

Mad Dog Modified
This class is intended to be a fun class with very close racing. Riders must be at least 14 years of age. Current professional riders are allowed. Motorcycle must be a single-cylinder, 4-stroke, air cooled engine originally displacing no more than 125cc. Engine modifications are allowed using the original crankcases and cylinder head as long as the final engine displacement is no more than 150cc. Any tires may be used except knobbies. Wheels and tires may be changed. The air filtration system, handlebars, triple clamps, wheels, sprockets, and rear shock may be changed. The front forks cannot be mechanically altered or replaced except for springs and oil. Disc brakes are not allowed. Frame modifications are not allowed. Altered and aftermarket exhaust systems are allowed. Maximum Rear wheel diameter is 17". The entry fee for this class is $15.00 per race for members and $20.00 for non-SEMDTRA members.

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