blankethillspeedway.net

250 Sportsman Micro Sprints

1. Steel shocks NON adjustable from cockpit

2. 10 square wing 48” sideboards NON adjustable from cockpit

3. Steel fuel and brake lines, may be tubing or braided steel

4. Absolutely NO onboard adjustments examples; wing, carburetor, shocks, panhard bar, weight jackers......

5. Run on alcohol

6. Minimum age for driver 14 PROOF OF AGE REQUIRED

7. Stock Honda CR250 engine single cylinder two-stroke factory produced liquid cooled engine

A. Engine must be stock in configuration with no internal or

performance enhancing modifications.

B. The following specific restrictions/allowances also apply

a. No porting, sanding, shaving, milling, grinding, etc. of

cylinder head

b. Power valve plugs must be machined to match cylinder

NO machining of cylinder head around power valve

plugs

c. No coatings

d. Cylinder and head must meet factory specifications for the year and make of motor.

e. Cylinder must hold 20.5cc of fluid at TDC for compression ratio test

f. No change in stroke, OEM crankshaft, and rod

g. No boring

h. No sleeving

i. No base plates

j. Gaskets must be OEM thickness

k. Stock OEM reed cage

l. No reed spacer

m. No aftermarket intake – all Honda units permitted

n. No fuel injection

o. No external air pumps or turbo charging

C. The engine must be stock in configuration with the following exceptions

a. Alcohol may be used

b. Any carburetor

c. Any reed pedals

d. Any pipe

e. Any mechanical fuel pump

f. Power valves may be removed

g. Clutch linkage and kick-starter assemblies may be removed and plugged

h. Remove and weld aluminum lug by chain sprocket on engine side

i. Remove and weld aluminum casting on case half where carburetor rests

j. After market covers may be used examples; clutch cover, ignition, power valve etc.

D. Transmission restrictions

a. Must have stock configuration for year and make

b. All OEM internal gears, bearings, shift forks, shafts, etc. must be in place

E. Transmission exceptions

a. Clutches may be removed and clutch hub may be

altered

b. May have a solid 5^th gear

All rules are subject to additions or changes as deemed necessary by track officials

RULES DISCLAIMER: No warranty of safety is expressed or implied as a result of this publication of the rules. Rules are intended as a guideline and are in no way a guarantee against injury or death to participants, spectators, or officials. Anything not covered by these specifications should be approved by the track officials and placed in writing.