BRP-Rotax
MAINTENANCE MANUAL LINE
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
oily, glossy coating
Possibly indicates one or more of the following:
• damaged valve stem seal
• misfiring
• too much oil in combustion chamber
• worn cylinder and piston rings
white with formation
of melt beads
Possibly indicates one or more of the following:
• mixture too lean
• leaking valves
Effectivity: 912 i Series
Edition 2/Rev. 0
12–20–00
Page 49
September 01/2018
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