__Calculating Minimum Weight__**1.**

**Rotary valve or Reed valve Two-Stroke Cycle Engine or Engines, 230 lbs**

plus one pound for each cc or fraction of a cc. Multiple engines or cylinders

are permissible. 255 cc maximum total displacement.

If this particular engine measured out to be 134.2cc the weight

plus one pound for each cc or fraction of a cc. Multiple engines or cylinders

are permissible. 255 cc maximum total displacement.

would be calculated as follows;

230 lbs (base weight) + 135 (rounded up to next whole cc) = 365 lbs

**2.**

**Flat Head Four-Stroke Cycle Engine or Engines, 190 lbs plus one**

pound for every 3cc or fraction of a cc. Multiple engines or cylinders are permissible. 500cc

maximum total displacement.

pound for every 3cc or fraction of a cc. Multiple engines or cylinders are permissible. 500cc

maximum total displacement.

If this engine measured out to be 251.2 cc the weight would be

calculated as follows;

Round up the cc to 252.

Divide 252 by 3. That = 84

190 lbs (base weight) + 84 (pounds added for engine disp.) = 274

lbs

**3.**

**Piston Port, McCulloch or US820 (West Bend) Two-Stroke Cycle Engine or engines, 170 pounds**

plus one pound for every cc or fraction of a cc. Multiple engines or cylinders

are permissible. 255 cc maximum total displacement.

If the engine pictured measured 98.7cc the weight would be calculated

plus one pound for every cc or fraction of a cc. Multiple engines or cylinders

are permissible. 255 cc maximum total displacement.

as follows;

170 lbs (base weight) + 99 (displacement rounded up) = 269 lbs

**4.**

Overhead Cam (OHC) Four-Stroke Cycle Engine or Engines, 245 lbs

plus one pound for every 2 cc or fraction of a cc. Multiple engines or cylinders

are permissible. 500cc maximum total displacement.

Overhead Cam (OHC) Four-Stroke Cycle Engine or Engines, 245 lbs

plus one pound for every 2 cc or fraction of a cc. Multiple engines or cylinders

are permissible. 500cc maximum total displacement.

If this engine measured 249.2 cc the minimum weight would be calculated as

follows;

Divide 249.2 cc by 2 which equal 124.6

Round

124.6 up to 125.

245lbs (base weight) + 125 = 370 lbs

**5.**

**Overhead Valve Push Rod (OHV) Four-Stroke Cycle Engine or**

Engines, 200 lbs plus one pound for every 2.5 cc or fraction of a cc. Multiple

engines or cylinders are permissible. 500cc maximum total displacement.

Engines, 200 lbs plus one pound for every 2.5 cc or fraction of a cc. Multiple

engines or cylinders are permissible. 500cc maximum total displacement.

If this engine measured 206.8cc the minimum weight would be calculated as

follows;

Divide 206.8 cc by 2.5 which = 103.4

Round up 103.4 to 104cc

200 lbs (base weight) + 104 = 304 lbs