Up and down play is normal on the driveshaft.----Factory stainless keys for impeller were never an issue.----Using --TYPE-C ---gear oil ( premium blend ) in the electric shift unit ?
Agreed.----That 31.8 Cubic inch block was even used for the zephyr sail drive rated at 15 HP.---The earlier models were 35 HP and later the same unit was 30 HP at the propshaft.----So all these ( 20 / 25 / 30 / 35 HP ) models use the same block.----The 15 HP block ( have a new one ) has tiny...
I can not see your carburetors !----If gas leaks out there is an issue with float or float valve.----Did you install factory carburetor kits?---Or a " good deal " from Amazon?