stock classes:
12 HP and under restricted 'kids class' (5-12 years old)
12 hp at 950 lbs.
10 hp and under at 975 lbs. 4000 rpm
12 hp and under (max 34 cid) at 1050 lbs. 4000 rpm
14 hp (max 34 cid) at 1050 lbs. 4000 rpm
18 hp (max 37 cid single, 50 cid twin) at 1050 lbs. 4000 rpm
**16 hp & less flathead single cylinder can run with 18 hp at 1075 lbs.**
25 hpat 1050lbs. 4250 rpm
30 hp 1125 lbs. 4250 rpm
(25 hp and 16 hp stock altered can run in class. see class rules)
altered stock classes
12 hp at 1050 lbs. - gas or alcohol
16 hp 1050 lbs. (nqs rules)
30 hp outlaw stock class:
30 hp stock tractors compete at 1125 lbs. at 12 1/2" hitch at 4250 rpm
25 hp stock tractors compete at 1150 lbs. at 13" hitch at 4250 rpm
16 hp stock altered compete at 1050 lbs (ngpts rules)
Mod stock class:
18 hp & 30 cube at 1050 lbs.
open super stock class
flathead super stock class
pro outlaw
