Sb359
Hi. Lycoming Mandatory Service Bulletin 359 relates only to Lycoming O-235 F and O-235 G engines. These engines have a different power rating than the more common O-235 L engines.
The service Bulletin requires the owner/operator to replace the normal Champion REM38E Spark plugs because they are too HOT for the engine and may cause detonation (pre-ignition) which will seriously damage the engine. The Bulletin recommends replacement of the REM38E plugs with AC-86 Spark Plugs which must be gapped between .018 inches and .022 inches.
Hope this answers your question: Rgs. Bob
A starter that is a replacement may not always fit the actual installation of your engine that is why manufactures offer a variety of models.
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