WALBRO CARBURETTOR
COLD START: In order to start from cold, prime the engine
with the petrol from the fuel feeder pump (PIC. 25) at the
same time pushing the button on the carburettor (PIC. 25B).
Then, use full-throttle when you pull the starting rope. This
is the only way of starting up the engine without any prob-
lems. Do not apply full-throttle too long and go back to idling
as soon as you are sure start-up was correct. With this ac-
tion, the engine should start operating normally, unless the
outside temperature is too low, therefore, we recommend
repeating the above procedure.
INLET
IMPORTANT: Before starting, check that throttle cable
is not sticking. To avoid this, just squeeze the throttle
several times.
WARNING: If you start the engine with the throttle open,
you should release the throttle before the engine’s RPM
increases and the engine pushes towards you.
(Pic. 25)
(Pic. 25B)
Ros 125 Engine, Components and Elements.
WARNING: Be aware that the pull start rope can pull back or be locked if you have
over primed the carburettor, and that it could hurt your hand due to its backward
movement. A 125 cc engine applies a lot of pressure when in compression state.
HOT START: No action is necessary with petrol priming when hot starting. You do NOT
need to throttle, otherwise you will flood the engine.
ADJUSTMENT OF THE CARBURATION
If you are not totally sure how to control and monitor this type of adjustment, avoid any
adjustments since this carburettor is quite stable at any heights and temperatures. Please
contact an expert to carry out this procedure.
The manufacturer has adjusted the carburettor before delivery.
A rich fuel mixture makes the engine vibrate and consume too much petrol, a weak mixture is
more regular but gets hotter more often and it becomes dangerous because it can damage
itself. Obviously, and from a safety point of view, first option is preferred.
SPARK PLUG COLOR
YELLOW / GREY
CAFÉ AU LAIT
BROWN / BLACK
CARBURATION
WEAK
OK
RICH
USER MANUAL
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Summary of Contents for RM80
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