11. SPARK PLUGS
The Victor 2 Plus / Victor 2 Super is installed with 2 NGK B9ES Spark Plugs on each Cylinder.
The gap on the spark plug electrodes should be between 0.45 to 0.5 mm.
As the fuel and oil that you use may vary from time to time; check the condition of all the spark
plugs on your engine regularly. Remember to check and clean the spark plug caps. At the same
time check for evidence of shorting caused by build-up of fretting residues (powdery substance).
Clean and re-gap plugs if necessary. Gap = 0.45mm to 0.5mm
Always replace all the four plugs at the same time. When replacing spark plugs after checks, you
should put them back in the same position. This will prevent possible damage to the cylinder head
threads. Always use anti-seize paste when instilling spark plugs.
If plugs are sooty with oil deposits, the engine is running too cold (i.e. too rich). The Carburetion
and Air Filters should be checked for cleanliness.
It is recommended only to use a semi- synthetic 2-stroke oil like Bardahl VBA or equivalent. Use
of Semi- Synthetic Oil pre-mixed in the petrol / avgas will greatly reduce the buildup of carbon
deposits in the cylinder heads and pistons.
If plugs have whitish deposits with evidence of melt droplets; it may be a lean mixture. If carburetor
calibration is correct and no evidence of manifold leaks neither lack of fuel nor incorrect float
settings is found, check the cooling system.
The temperature measured under the spark plugs Cylinder Head Temperature (CHT) on each
cylinder must not exceed 120° C. at full power.
The temperature of the coolant exiting the cylinder heads (water Temperature) at maximum power
must not exceed 80° C.
The Normal Operating temperature range for the Coolant / Water temperature is between 55° C to
65° C.
Do not take-off until the Water temperature has reached 50° C.
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