10 DR
®
VERTICAL SHAFT ENGINE
Chapter 4: Maintaining the Exhaust Control System
Exhaust Control System Service
With the Engine running, carbon monoxide, oxide of nitrogen and hydrocarbon will be produced. In certain conditions, oxide
of nitrogen and hydrocarbon will react chemically with each other to make carbon monoxide and is toxic. Exhaust control is
therefore very important. We decrease the exhaust emissions by introducing poor-fuel carburetors and other devices into the
Engine to solve the problem. To keep the exhaust of your Engine within the standard exhaust emission, pay attention to the
following:
Maintenance
Maintain the Engine periodically in accordance with the maintenance schedule in the manual. The maintenance schedule is
made out on the base of normal use in normal conditions. If using under heavy load, dusty or wet circumstances or in high
temperature, service of the Engine should be done more often.
Replacing Parts
To ensure the best quality and reliability, use only new genuine DR Power Equipment parts or their equivalents for repair and
replacement.
Tampering and Altering
Tampering with or altering the emission control system may increase emissions beyond the legal limit. Among those acts that
constitute tampering are:
• Removal or alteration of any part of the intake, fuel, or exhaust systems.
• Altering or defeating the governor linkage or speed-adjusting mechanism to cause the Engine to operate outside its design
parameters.
Problems Affecting Exhaust Emissions
• Difficult starting or difficult stopping.
• Unstable idle speed.
• Give off black smoke or consume too much fuel.
• Poor ignition spark or spark knock.
• Too early ignition.
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