Mercury Mariner Models 135 150 175 200 Service Manual, Page 145Get this manual

Mercury Mariner Models 135 150 175 200 Service Manual, Page 145

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TIMING, SYNCHRONIZINGADJUSTING
NOTE: ECM harness remains disconnected for maximum timing adjustmentTiming light remains hooked up to no.1 cylinder1 Hold throttle arm (a) so that maximum spark ad