Owosso Kart Speedway - OKS

All Karts must have a muffler

Rotary valve or Reed valve Two-Stroke Cycle Engines

1. Single Cylinder Small Displacement 2-Cycle Engines

• · Maximum displacement 199cc
• · Minimum weight 200 lb. plus one pound per cc or fraction of a cc.

2. Single Cylinder Large Displacement 2-Cycle Engines

• · 200cc to maximum of 275cc maximum displacement allowed.
• · 200cc to 255cc minimum weight is 400 lbs.
• · 256cc to 275cc minimum weight is 430 lbs.

3. Multiple Engine 2-Stroke (No common crankcase multiple cylinder engine.)

• · For engine combinations up to 229cc the minimum weight is 200 lbs. plus one pound per cc or fraction of a cc.
• · For engine combinations 230cc to 275cc the minimum weight is 430 lbs.

Flat Head Four-Stroke cycle Engine

1. 190 lbs. plus one pound for every 3cc or fraction of a cc. multiple engines or cylinders are permissible.

2. 500cc maximum total displacement with a tolerance of 10cc when checked

Pistion Port Two-Stroke Cycle Engine

1. 130 lbs. plus one pound for each cc or fraction of a cc.

2. Multiple engines or cylinders are Permissible

Overhead Cam (SOHC or DOHC) Four-Stroke Cycle Engine

1. Overhead cam engine or engines, multiple cylinders permitted. 500cc maximum displacement +/- 10cc when checked.

2. Minimum weight as follows; 205 lbs. plus 1 lb. for every 2 cc’s or fraction of a cc. Any engine or combination of engines from 450cc to 500cc are capped at a minimum weight of 430 lbs. unless power adders are used.

Overhead valve (OHV-Push Rod) Four-Stroke cycle Engine

1. 200 lbs. plus one pound for every 2.5cc or fraction of a cc. multiple engines or cylinders are permissible, 500cc maximum total displacement with a tolerance of 10cc when checked.