| Miami County Speedway 1079 West 200 North Peru, Indiana 46970 Track 765-475-9705 Additional Information: 574-753-3238 * 765-513-5535 * 317-541-8510 |
| Saturday Night Racing at the Miami County Fairgrounds |
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| Restrictor Class Rules |
1) AGE
Drivers age 9 and up may compete in the Restrictor Class. A copy of birth
certificate or state issued photo ID must be provided for any driver under
the age of 18.
2) CAR IDENTIFICATION
All Restrictor Class cars must have a clearly visible "R" on the nose or nose
wing of the car. All car running a fuel injected engine must also have a "I" in
the same location.
3) SHOCKS
Any shock absorber legal, except no cockpit adjustable.
4) TIRES and WHEELS
Any wheel size and tire combination may be used, but tires may not exceed
22 1/2 inches in height. Wheels must be held on with 4 or more standard
lug nuts or knock-off hubs. Right rear tire must be plated NMMA, ASCS2 or
MD-57, a minimum 50 durometer compound Hoosier or American Racer
tire. Tire may be be siped or grooved. Tire durometer check should be
done at least 15 minutes after the races to allow for cool down. Tire is
subject to verification at any point during the race event.
5) WINGS
Cars must run a 10 square foot maximum top wing with a one piece center
section (no multi stage airfoil wings allowed). Airfoil must be parallel with
roll cage and no offset sideboards (front to rear). No Twisted wings.
Sideboard right side, maximum 18” tall x 48” long. Sideboard, left side,
maximum 24” tall x 48” long. No mechanical, electrical or hydraulic
adjustments are allowed in the cockpit area. Wing must not extend outside
the tires or beyond the bumpers as driven. Nose wings optional. If a nose
wing is used, the center section may not exceed 18” x 24” with sideboards
no larger than 9” tall x 21” long.
6) STAGING AREA
Once a car enters the staging area it is considered race ready. No legality
changes may be made. If a car is not legal once it reaches the staging area it
will be disqualified for that specific event.
7) COCKPIT ADJUSTMENTS
Functioning cockpit adjustments are NOT allowed.
8) SELF STARTING
All cars must be self starting. Any car requiring a push vehicle from the
staging area will start at the tail of that race.
9) ENGINE RULES
4 cycle multi-cylinder engines not exceeding 600cc with stock bore & stroke
with charging unit. Valve jobs will be allowed as long as they are within mfg.
tolerance allowance. Any air cleaner will be allowed. Any exhaust will be
allowed. Crank case ventilation to atmospheric pressure only is allowed.
Carburetors must be OEM Production Motorcycle, CV style. No Flatslides or
Lectron style carburetors allowed. Carburetors may have metering rods, jets
and springs changed to tune fuel curve to match the car requirements. TPS
sensors not required. Any motor sprocket (520 or 530) is allowed. Outer
cosmetic changes will be allowed to mount the motor in the car (i.e. cut part
of the engine off to get it to fit, relocate oil pan drain plug, etc.).
Fuel Injected Engines running Carburetors
Engines originally equipped with Fuel Injection are allowed with any OEM
production Motorcycle CV Style Carburetors and aftermarket filter boxes.
Interchanging of Injected and Carbureted cylinder heads is allowed. Engines
must be run with the OEM/Stock Ignition system from either the carbureted
or injected engine, using the unaltered, stock, Motorcycle OEM
components. No MSD, MoTec, Tec3, or any other aftermarket ignition
systems allowed. CDI black box must be stock
and unaltered.
All engines must start out as 600cc factory fuel injected engines. They must
run the OEM throttle bodies and the correct number of injectors for the
engine. They may run methanol or track approved gasoline. They may run a
Power Commander for fuel map only. At this time due to the tracks inability
to produce restrictor plates each person will be responsible for producing
their own plates.
The restrictor plates must be run between the throttle bodies and the
engine. They must be a flat plate constructed of a non corrosive material not
less than .030 thick and not more than .090 thick. They must fit tight in the
manifold boots and have a maximum of one .750 Max. round hole, no
tolerance will be allowed. All plates must be inspected, approved and
marked by the officials of Miami County Speedway.
There should be nothing between the throttle plate and the intake valves
that is designed to enhance the airflow through the restrictor opening. This
includes anything, either added to or machined into the carburetor,
manifold or boot, head, etc that would create a cone shape to the airflow
entering or exiting the restrictor. Anything that appears to be specifically
designed to enhance airflow through the restrictor will be judged illegal.
Billet boots are OK. But they should be the same shape used for the non-
wing class. The walls should have a relatively consistent cross section area
and be shaped similar to stock units.
Any car that chooses to run a fuel injected engine in the Restrictor
Class must weigh 775 lbs minimum and have an "I" in the same
location as the "R".
Engine Tech Items
Restrictor size - .750 Go, .7505 No Go - in I.D. - as stamped, round hole in
center
Installed in the top half of boot, fitting in the groove snuggly
Kawasaki & Yamaha OD - 1.658 min.
Honda OD - 1.600min.
No alterations
Stock bore & stroke - 600cc
Cam Shafts - stock, OEM, unaltered in proper location
Cam Gears - stock, OEM, unaltered bolt holes, unaltered bolts
Intake & Exhaust Port Areas - "as cast", no grinding, polishing or porting
Ignition trigger wheel/advancer - stock, OEM, unaltered in any way, CDI box
matching trigger wheel A.K.A. signal rotor.
Flywheel - original stock, OEM charging system must be intact, unaltered
and in place
CDI / ECU "Black Box" - stock OEM - unaltered.
All transmissions gears intact and functional
No cones in carburetors or air box
Clutch must be FUNCTIONAL
Drivers age 9 and up may compete in the Restrictor Class. A copy of birth
certificate or state issued photo ID must be provided for any driver under
the age of 18.
2) CAR IDENTIFICATION
All Restrictor Class cars must have a clearly visible "R" on the nose or nose
wing of the car. All car running a fuel injected engine must also have a "I" in
the same location.
3) SHOCKS
Any shock absorber legal, except no cockpit adjustable.
4) TIRES and WHEELS
Any wheel size and tire combination may be used, but tires may not exceed
22 1/2 inches in height. Wheels must be held on with 4 or more standard
lug nuts or knock-off hubs. Right rear tire must be plated NMMA, ASCS2 or
MD-57, a minimum 50 durometer compound Hoosier or American Racer
tire. Tire may be be siped or grooved. Tire durometer check should be
done at least 15 minutes after the races to allow for cool down. Tire is
subject to verification at any point during the race event.
5) WINGS
Cars must run a 10 square foot maximum top wing with a one piece center
section (no multi stage airfoil wings allowed). Airfoil must be parallel with
roll cage and no offset sideboards (front to rear). No Twisted wings.
Sideboard right side, maximum 18” tall x 48” long. Sideboard, left side,
maximum 24” tall x 48” long. No mechanical, electrical or hydraulic
adjustments are allowed in the cockpit area. Wing must not extend outside
the tires or beyond the bumpers as driven. Nose wings optional. If a nose
wing is used, the center section may not exceed 18” x 24” with sideboards
no larger than 9” tall x 21” long.
6) STAGING AREA
Once a car enters the staging area it is considered race ready. No legality
changes may be made. If a car is not legal once it reaches the staging area it
will be disqualified for that specific event.
7) COCKPIT ADJUSTMENTS
Functioning cockpit adjustments are NOT allowed.
8) SELF STARTING
All cars must be self starting. Any car requiring a push vehicle from the
staging area will start at the tail of that race.
9) ENGINE RULES
4 cycle multi-cylinder engines not exceeding 600cc with stock bore & stroke
with charging unit. Valve jobs will be allowed as long as they are within mfg.
tolerance allowance. Any air cleaner will be allowed. Any exhaust will be
allowed. Crank case ventilation to atmospheric pressure only is allowed.
Carburetors must be OEM Production Motorcycle, CV style. No Flatslides or
Lectron style carburetors allowed. Carburetors may have metering rods, jets
and springs changed to tune fuel curve to match the car requirements. TPS
sensors not required. Any motor sprocket (520 or 530) is allowed. Outer
cosmetic changes will be allowed to mount the motor in the car (i.e. cut part
of the engine off to get it to fit, relocate oil pan drain plug, etc.).
Fuel Injected Engines running Carburetors
Engines originally equipped with Fuel Injection are allowed with any OEM
production Motorcycle CV Style Carburetors and aftermarket filter boxes.
Interchanging of Injected and Carbureted cylinder heads is allowed. Engines
must be run with the OEM/Stock Ignition system from either the carbureted
or injected engine, using the unaltered, stock, Motorcycle OEM
components. No MSD, MoTec, Tec3, or any other aftermarket ignition
systems allowed. CDI black box must be stock
and unaltered.
All engines must start out as 600cc factory fuel injected engines. They must
run the OEM throttle bodies and the correct number of injectors for the
engine. They may run methanol or track approved gasoline. They may run a
Power Commander for fuel map only. At this time due to the tracks inability
to produce restrictor plates each person will be responsible for producing
their own plates.
The restrictor plates must be run between the throttle bodies and the
engine. They must be a flat plate constructed of a non corrosive material not
less than .030 thick and not more than .090 thick. They must fit tight in the
manifold boots and have a maximum of one .750 Max. round hole, no
tolerance will be allowed. All plates must be inspected, approved and
marked by the officials of Miami County Speedway.
There should be nothing between the throttle plate and the intake valves
that is designed to enhance the airflow through the restrictor opening. This
includes anything, either added to or machined into the carburetor,
manifold or boot, head, etc that would create a cone shape to the airflow
entering or exiting the restrictor. Anything that appears to be specifically
designed to enhance airflow through the restrictor will be judged illegal.
Billet boots are OK. But they should be the same shape used for the non-
wing class. The walls should have a relatively consistent cross section area
and be shaped similar to stock units.
Any car that chooses to run a fuel injected engine in the Restrictor
Class must weigh 775 lbs minimum and have an "I" in the same
location as the "R".
Engine Tech Items
Restrictor size - .750 Go, .7505 No Go - in I.D. - as stamped, round hole in
center
Installed in the top half of boot, fitting in the groove snuggly
Kawasaki & Yamaha OD - 1.658 min.
Honda OD - 1.600min.
No alterations
Stock bore & stroke - 600cc
Cam Shafts - stock, OEM, unaltered in proper location
Cam Gears - stock, OEM, unaltered bolt holes, unaltered bolts
Intake & Exhaust Port Areas - "as cast", no grinding, polishing or porting
Ignition trigger wheel/advancer - stock, OEM, unaltered in any way, CDI box
matching trigger wheel A.K.A. signal rotor.
Flywheel - original stock, OEM charging system must be intact, unaltered
and in place
CDI / ECU "Black Box" - stock OEM - unaltered.
All transmissions gears intact and functional
No cones in carburetors or air box
Clutch must be FUNCTIONAL