Andrews-plant dedicated gaging systems were custom engineered by Sheffield to new gearcase
designs and installed in March, 1988 and mid '89.
Also, change the gearcase
oil and crankcase oil after 20 hours, and replace the oil filter after 200 hours or one year.
While many innovations can't be seen without taking off the cowling, looking at the lower unit on Suzuki's 250SS will leave no doubt that this streamlined bullet gearcase
came directly from offshore racing.
has a multitude of places oil can escape: the propshaft seal, the "spaghetti" seal between the halves, the driveshaft seal under the water pump and the shift-shaft seal.
A change in gearcase
will run you close to $5,000 just to achieve an additional 2 or 3 mph.
Unless the gearcase
water pickups are running perilously close to the surface of the water where they can start sucking air instead of water (like a bass boat/jack plate situation), as long as the water pump is in decent shape the engine will run in the temperature parameters designed for it, and the alarm will come on if there is overheating.