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My supersport project had a slight leak and the main problem was the starter motor gasket (metal).
That plug, the starter and the join between the engine casing and horizontal cylinder are the only things hidden down there hidden by the starter motor.
To get to the plug you suspect you'll have to drop the starter anyway so make sure you get a new starter gasket and good sealant to re attach it.
Sadly the starter will have a bolt inside the engine so you'll need to pull the alternator cover to access it.
Not a big job but you should get a cover puller tool to take it off nicely, make sure you mark the alignment of your gear shift lever to the shaft it mounts to.
 

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Do I need to pull the plugs in order to rotate the engine to get the access hole to line up?
Off memory that gear should move by hand easily in one direction as the the starter sprag clutch should only push the flywheel in one direction and free spin the other way.

A lot of times, holes like that are made for other internal machining like oil passages, ball/spring detents, etc
These are holes through the gear that is driven by the starter, not engine cases or anything like that.
 
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