FUEL SYSTEM/CARBURETION
4.1
JETTING GUIDELINES
Changes in altitude and temperature affect air density, which is essentially the amount of oxygen available for
combustion. In low elevations and cold temperatures, the air has more oxygen. In higher elevations and higher
temperatures, the air is less dense.
Carburetors are calibrated for an altitude of 0-3000 ft. (0-900 meters) and ambient temperatures between +40
and +80° F(+5° to +26° C). Carburetors must be re-calibrated if operated outside the production temperature
and/or altitude range. The main jet installed in production is not correct for all altitudes and/or temperatures. In
addition, air screw / pilot screw adjustments may be required to suit operating conditions.
CAUTION:
Amain jet that istoosmall willcausealeanoperatingcondition andmaycauseserious enginedamage.
Select thecorrect main jet carefullyfor elevation and temperatureaccording to the charts in theGeneral/
Specifications Chapter, or in the Owner’s Safety and Maintenance Manual for each particular model.
MAIN JET SELECTION
IMPORTANT: The following guidelines must be followed when establishing a main jet setting:
1. Select the lowest anticipated temperature at which the machine will be operated.
2. Determine the lowest approximate altitude at which the machine will be operated.
3. Select the correct main jet from the chart.
4. Clutching changes may also be required for changes in elevation. Refer to clutching charts in General /
Specifications Chapter 1 for recommendations.
W ARNING
Gasoline is extremely flammable and explosive under certain conditions.
Always stop the engine and refuel outdoors or in a well ventilated area.
Do not overfill the tank. Do not fill the tank neck.
Neverstarttheengineorlet itruninanenclosedarea. Gasolinepoweredengineexhaustfumes arepoison-
ous and can cause loss of consciousness and death in a short time.
Never drain the float bowl when the engine is hot. Severe burns may result.
Do not smoke or allow open flames or sparks in or near the area where refueling is performed or where
gasoline is stored.
If you get gasoline in your eyes or if you should swallow gasoline, see your doctor immediately.
Ifyouspillgasolineonyourskinorclothing,immediatelywashitoffwithsoapandwaterandchangeclothing.
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