Hi guys, never owned or worked on an outboard, but I just borrowed a 3.0 gamefisher from a neighbor of mine to use on a friends 12' jon boat 
Anyway, the motor was in storage for an unkown amount of time. I did basic stuff like clean the carb, derust and paint the throttle pole and lube the throttle cable, sprayed some wd-40 through the spark hole and got a new spark plug etc. and it fired right up <br /><br />Here's my problem. I put some 85w-140 gear oil (I assume this was what to use?) in the 'lower unit' and the next morning I come to find a decent amount had leaked from the lower unit onto the floor. I figure what it needs is a new gasket. from reading this forum I learned that www.searspartsdirect.com is the place to go so I entered the model numer and voila... Model 3.0HP OUTBOARD MOTOR - 298586192 (FIG. 6 DRIVE SHAFT PIPE & GEAR CASE) However, I'm not sure what part it is. I think it's probably a GEAR CASE GASKET, or an OIL SEAL or a DRAIN GASKET? I don't have a manual to go off of...any help? <br /><br />1 more thing, I put 32:1 pre-mix in it but I just read in another post that JB recommends 20:1 for an air cooled engine. should I add a little more oil to whats in the tank and run a 20:1 mix from now on? doesn't adding more oil cause a leaner fuel mixture? is this ok cause these are low compression motors? should I use like an 89 octane gas with 20:1?
Anyway, the motor was in storage for an unkown amount of time. I did basic stuff like clean the carb, derust and paint the throttle pole and lube the throttle cable, sprayed some wd-40 through the spark hole and got a new spark plug etc. and it fired right up <br /><br />Here's my problem. I put some 85w-140 gear oil (I assume this was what to use?) in the 'lower unit' and the next morning I come to find a decent amount had leaked from the lower unit onto the floor. I figure what it needs is a new gasket. from reading this forum I learned that www.searspartsdirect.com is the place to go so I entered the model numer and voila... Model 3.0HP OUTBOARD MOTOR - 298586192 (FIG. 6 DRIVE SHAFT PIPE & GEAR CASE) However, I'm not sure what part it is. I think it's probably a GEAR CASE GASKET, or an OIL SEAL or a DRAIN GASKET? I don't have a manual to go off of...any help? <br /><br />1 more thing, I put 32:1 pre-mix in it but I just read in another post that JB recommends 20:1 for an air cooled engine. should I add a little more oil to whats in the tank and run a 20:1 mix from now on? doesn't adding more oil cause a leaner fuel mixture? is this ok cause these are low compression motors? should I use like an 89 octane gas with 20:1?