The non-threaded boss on the oil pressure switch plate is for a temp sensor. There were a couple model bikes that used the boss but not many.
The blank on the oil filter cover could be drilled and tapped for a fitting to be used by an oil cooler, but I've never studied the particular pros and cons of doing this. Most people just route all the oil from the oil distribution cavity behind the engine since this method is tried and true.
The GS650 Katana model is one of the only 2V GS bikes to employ an oil cooler. For that bike Suzuki made a special oil pan, with a built in thermostat, with take off fittings for attachment of the cooler lines.
Kawasaki KZ bikes also used a similar oil pan take off methodology for their bikes with oil coolers, at least some of them, but Kawasaki didn't bother with the thermostat.
The blank on the oil filter cover could be drilled and tapped for a fitting to be used by an oil cooler, but I've never studied the particular pros and cons of doing this. Most people just route all the oil from the oil distribution cavity behind the engine since this method is tried and true.
The GS650 Katana model is one of the only 2V GS bikes to employ an oil cooler. For that bike Suzuki made a special oil pan, with a built in thermostat, with take off fittings for attachment of the cooler lines.
Kawasaki KZ bikes also used a similar oil pan take off methodology for their bikes with oil coolers, at least some of them, but Kawasaki didn't bother with the thermostat.
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