Ignition Timing; Two/Four Stroke Timing (Points Ignition) - Tecumseh SPECTRA 37 Service And Repair Manual

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3. IGNITION TIMING

GENERAL
All engines are correctly timed before delivery and the
timing marked as in Fig 19 (Points Ignition).
On engines with outside coil and solid state, ignition timing
is fixed.
TWO STROKE TIMING (Points Ignition)
- Set breaker points to 0.45 ÷ 0.50 mm (.20").
- Remove sparking plug, insert a narrow rule on to piston
top, place a straight edge across top of cylinder.
(A special tool is available for this operation), (Fig 20).
- Turn crankshaft in direction of rotation and bring piston
to top dead centre indicated by position of rule against
edge or on scale of special tool.
- Refer to table for correct amount of advance. Turn
engine in reverse direction until this is obtained, denoted
by rule position against straight edge or scale on special
tool.
- Slacken stator securing bolts and turn until points are
just about to open. If a test light is not available for this
operation, insert a piece of cigarette paper between
the points and turn until paper just becomes free; at this
point lock stator.
FOUR STROKE TIMING (Points Ignition)
- Set points to 0.45 - 0.50 mm (.020").
- Accurate timing is best achieved by removing the
cylinder head and gasket, turn engine to top dead centre
and using gauge (Fig 22) set timing following the pro-
cedure for two stroke engines; special tools are available
for this operation (Figs 21 and 22).
- Dial gauge timing tool - part no. 670241 (Fig 21) may
be used without removal of the cylinder head.
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Fig. 19
Fig. 20
Fig. 21
Fig. 22
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