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8.4) Carburettor
The carburettor regulates engine speed through the accelerator and blends air and fuel together.
The rail saw's engine is regulated during manufacture so that harmful emissions are reduced
to a minimum.
The complete running in of the engine is achieved after having topped up the fuel tank
8-10 times.
Avoid adjusting the carburettor unless absolutely necessary.
• Main nozzle
The engine is equipped with a fi xed nozzle that ensures the correct supply of the blended air
and fuel. If the engine is losing power or is not accelerating, clean or if necessary replace the air
fi lter. If this does not resolve the problem, contact Cembre.
• Final adjustment of minimum speed T
The engine's minimum speed is adjusted through screw T. If an adjustment is required, turn
clockwise until the cutting disc starts to turn, then slowly turn anticlockwise until the disc stops
turning. The minimum speed is adjusted correctly when the engine accelerates correctly.
Minimum rpm advised: 2700 rpm.
The cutting disc must remain still at minimum speed.
8.5) Exhaust Muffl er
Burns risk!
The muffl er has been designed to reduce noise levels
and to channel exhaust fumes away from the operator.
Check the muffl er and its fi xings regularly to ensure
there is no damage.
Exhaust fumes are hot and can contain sparks which
may set fi re to dry and fl ammable material anywhere
near the machine.
Never use the machine with a muffl er that is clogged
or faulty.
25
L
T
• Carburettor adjustment
Fully press the accelerator a couple of times and check
that the rail saw accelerates as expected.
Screw L is factory set open by 1 and a 1/4 turns. If an
L
T
adjustment is necessary, turn it clockwise until there is
no fuel in the engine; then open it 1/8 turn anticlockwise.
Check engine acceleration.
NOTE: A poor adjustment of low speed (screw L too
tight) can cause diffi culty when starting the engine.
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