Robin EY27-2 User Manual

7-3 TIMING ADJUSTMENT
With the Model EY14, EY18-3, EY25-2 and EY27-2 engines, the spark is timed to occur 23O
before the piston reaches TDC on the compression stroke. This spark advance of 23O is
controlled by the breaker point opening and this advance is obtained when the breaker point
opening
is adjusted according to the BREAKER POINT ADJUSTMENT to 0.35 mm (0.014 inch).
However,
the advance timing is more accurately adjusted through the following procedures,
using a timing light as shown in Fig. 7-3-1.
For timing adjustment, the following alignment marks are provided.
EY 14: Projection at upper left crankcase
EY25-2 D & EY27-2 D type: D mark at lower left crankcase (see Fig. 7-3-2)
EY25-2 B & EY27-2 B type: 3 mark at upper left crankcase
n
M mark and slit on flywheel circumference
M mark and slit on flywheel circumference
M mark and slit on flywheel circumference.
M mark and slit on flywheel circumference
EY18-3: M mark and relief line at upper left crankcase
Flywheel W
Fig. 7-3-1 Fig. 7-3-2
For timing adjustment, the following procedures using a timing light:
Disconnect
the stop button lead wires and the coil primary wire.
Remove blower housing from engine.
Connect one
of the timing light leads to the coil primary wire and ground the other lead to
crankcase. (See Fig.
7-3-1)
While the points are open, the light remains on and when the points are closed, the light is
extinguished.
Turn flywheel slowly counter-clockwise
(D type engines) or clockwise !I3 type engines) until
the light extinguishes.
Then, turn flywheel very slowly clockwise
(D type engines) or counter+lockwise (B type
engines) and stop immediately
the moment the light lights up. Check if tine slit on the
flywheel is in the line with the mark on the crankcase. When the mark line is in alignment,
the timing is cowect.
If the timing mark lines are not in alignment, then re-adjust the point opening according to
the BREAKER POINT ADJUSTMENT, by removing the flywheel and repeat the checking
procedures
3) through 5).
After completing the timing adjustment, re-mount the blower housing and connect the coil
primary lead to the stop button.
/1
-30 -

Robin EY27-2 Specifications

General

Brand	Robin
Model	EY27-2
Category	Engine
Language	English