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Totally different mota....no need to double gasket/s. Need to get a OEM manual and set the carbs in the water as described as 5 turns is just a starting
Is it creating issues? It is called a antiventilation plate but commonly called a cavitation plate. Ventiolation is when air gets sucked into the prop
the module would not normally be a tune up part. I've seen a couple fail and run, usually they cut off after getting warm.
Tuning for boat