ENGINE
POWER RATINGS
The power ratings for an individual engine model are initially devel-
oped by starting with SAE (Society of Automotive Engineers) code
J1940 (Small Engine Power & Torque Rating Procedure) (Revision
2002-05). Given both the wide array of products on which our
engines are placed, and the variety of environmental issues appli-
cable to operating the equipment, it may be that the engine you
have purchased will not develop the rated horsepower when used
in a piece of power equipment (actual “on-site” power). This differ-
ence is due to a variety of factors including, but not limited to, the
following: differences in altitude, temperature, barometric pres-
sure, humidity, fuel, engine lubrication, maximum governed engine
speed, individual engine to engine variability, design of the partic-
ular piece of power equipment, the manner in which the engine is
operated, engine run-in to reduce friction and clean out of combus-
tion chambers, adjustments to the valves and carburetor, and other
factors. The power ratings may also be adjusted based on compar-
isons to other similar engines utilized in similar applications, and
will therefore not necessarily match the values derived using the
foregoing codes.
Check Crankcase Oil Level before starting engine and after each 8
hours of continuous use (see Figure 25). Add the recommended
motor oil as required.
NOTE: Overfilling the engine can affect performance. Tighten the
oil fill cap securely to prevent leakage.
Change Oil every 50 hours of operation or at least once a year,
even if the snowthrower is not used for fifty hours. Use a clean,
high quality detergent oil. Fill the crank case to FULL line on dip-
stick (see Figure 25). Be sure original container is marked: A.P.I.
service “SF” or higher. Do not use SAE10W40 oil (as it may not
provide proper lubrication). See Chart for oil recommendations.
To Drain Oil – Position snowthrower so that the oil drain plug is low-
est point on engine. When the engine is warm, remove oil drain plug
and oil fill cap and drain oil into a suitable container (Figure 26).
Replace oil drain plug and tighten securely. Refill crank case with
the recommended motor oil.
Figure 26
Oil Fill Cap/
Dipstick
Oil Drain
Plug
Figure 25
Oil Fill Cap/Dipstick
Full
NOTE: Oil level must be at FULL mark.
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