BRP ROTAX 916 i A Series - Page 170

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- colored
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
12–20–00
Page 46
December 01 2023
Effectivity: 916 i A / C24
Edition 0/Rev. 1