GX240 • GX270 • GX340 • GX390 (UT2/RT2) Technical Manual
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Rigid Engine Mount Muffler Installation.
The frame must be rigid to prevent cracking when the exhaust pipe and muffler are connected. The muffler should be
installed securely with bolts and nuts.
The muffler should be supported at two points (or more) using special rubber mounts designed for muffler support
applications.
Check to see muffler vibration does not increase at any given engine speed, causing an abnormal increase in
resonance.
Rubber Engine Mount Muffler Installation
A flexible pipe should be used between the muffler and exhaust pipe when the engine is mounted to the engine bed
with rubber mounts. The flexible pipe ID must be the same as the exhaust pipe OD or larger.
The muffler should be supported at two points (or more) and should be installed securely with bolts and nuts to prevent
muffler cracking from vibration during starting and stopping.
Check to see muffler vibration does not increase at any given engine speed, causing an abnormal increase in
resonance.
ENGINE MOUNTING
Use an engine bed or frame with enough rigidity to allow maximum durability
of the engine and attachment installation.
The engine must not wobble on the engine bed. Use an engine bed or frame
that provides a flat surface for the engine to be mounted on. If there is a gap
between the engine and the engine bed, the engine-mounting surface may
be damaged.
Inclination
Horizontal mounting and operation of the engine is recommended. If the
engine must be operated on a slope, the incline position of the engine must
not exceed 20° in any direction.
Resonance Check
There must be no resonance when the engine and attachment are operated within the designated speed range. Slowly
raise the engine speed from idle to maximum and check for resonance at any engine speed.
General Methods for Preventing Resonance
When engine accessories or a part of the attachment is resonating, increase the rigidity of the resonating part to bring
the resonance point higher than the working engine speed range.
• Increase the rigidity of the engine bed and frame to bring the resonance point higher than the working engine
speed range.
• Install the muffler on the engine body, using a rigid stay to prevent resonance of the muffler when the engine speed
is within the specific operating speed range.
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