The 9.8A2 and A3 (you didn't say which model -- year is irrelevant) have an exciter, a pulser, and a CD. Any one could be failing hot. The exciter and pulser can be tested with an ohm meter.
FRESHWATER FLUSHING PLUG (40D~140A 2-STROKE & TLDI)
Description
Attaches hose to motor in order to flush motor with freshwater after use in saltwater and/or brackish water.
Fits 40D ~ 140A 2-stroke models and 40-115 TLDI models
Note: picture may not be of actual part
Part #: 3B7600070M...
I have seen those up to 6 turns out. Set by machine at the factory. Of course, the proper way to remove one is to close it (gently) and count the turns. When reassembling, set to same number of turns.