Introduction; Design Features; Emission Regulations - Honda GX630 Technical Manual

GX630 • GX660 • GX690 Technical Manual
I
NTRODUCTION
GX690
Honda engines are designed for minimal maintenance. When
maintenance is required, the task is kept simple by providing
convenient maintenance access and procedures.
Honda engines use proven engine technology and design
innovations to make them the most reliable engines.
D F
ESIGN EATURES
High Performance
The new design one-piece head/cylinder provides increased
combustion efficiency and cylinder cooling capacity, allowing
for higher compression and higher engine output.
Combustion efficiency has been improved through the use of
a hemispherical combustion chamber with the spark plug
placed closer to the center of the chamber. Cooling efficiency
has been increased by combining the cylinder barrel and
head, and providing external push rod tubes.
Smooth and Quiet Operation
OHV design provides a reduced reciprocating mass and balanced weight distribution. These features and the compact
design result in extremely smooth operation.
Use of proven design technologies reduces noise from internal engine components. The hardness of reciprocating
parts, the helical cut gears on the crankshaft and camshaft, and the use of select materials makes these engines
exceptionally quiet. The optional large mufflers are designed to further reduce noise.
Durability/Reliability
Honda engines are built with quality that provides proven durability and reliability. Proven features such as OHV design
and cast iron cylinder sleeve provide long life in all types of operating conditions. To further enhance the reliability of
these engines, a 2-stage air cleaner system, electronic ignition system, mechanical centrifugal governor, and proven
side-draft carburetor are standard features.
E R
MISSION EGULATIONS
The Honda GX630, GX660, and GX690 engines meet U.S. Environmental Protection Agency and the California Air
Resources Board regulations when fitted with a certified fuel delivery system and either a Honda genuine muffler or a
certified muffler.
Honda-designed equipment integrates the engine to match the load and packaging requirements of both the engine
and the product. Honda engine distributors and equipment manufacturers that use Honda engines are required
by regulation to follow this OEM technical manual. Correct engine matching ensures that the engine will be durable
(and emissions durable) in use.
Refer to the Honda Emission Regulation Guide (TO971) for additional emissions information.
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