BRP-Rotax
MAINTENANCE MANUAL LINE
REPLACEMENT OF SPARK PLUGS
General note
ATTENTION
Use of incorrect spark plugs can result in ignition problems and pre-ignition and
consequent engine damage.
In numerous tests the best possible heat range has been determined to make sure that
the spark plug will burn off deposits but will not overheat.
Renewal intervals
NOTE
Operation with leaded fuels (e.g. AVGAS 100LL) can result in increased wear of
the spark plugs. Reduce renewal intervals accordingly.
Spark plugs
See Illustrated parts catalog for the engine type .
REMOVE THE SPARK PLUGS
Remove Remove the spark plugs and store them according to cylinder and position.
INSPECTION OF SPARK PLUGS
Visual check Inspect all spark plugs for mechanical damage.
Electrode gap
NOTE
Inspect the electrode gap also on new spark plugs before installation.
Electrode gap
New Wear limit
0.8 - 0.9 mm (0.031 - 0.035 in) 1.1 mm (0.043 in)
Spark plug face Spark plug face reveals the following about the operating condition of the engine:
Spark plug face Information
light tan- coloured
plug and calibration of the engine are correct
velvet black
Possibly indicates one or more of the following:
• mixture too rich
• insufficient air intake (clogged air filter)
• engine operating temperature too low
Effectivity: 912 Series
Rev. 0
12–20–00
Page 57
January 01 2020
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