I own a 1994 115 HP TLRS Yamaha outboard motor mounted on the back of my pontoon boat. Reason I mention the pontoon boat is this makes the front of my motor hard to access. My boat sat for about a year. I recently took off the 2 carbs, thoroughly cleaned and rebuilt them with a Yamaha Carb rebuild kit. I have a Clymer engine manual and followed all the steps for removal, disassembly, cleaning, rebuilding and reinstalling the carbs. Problem is the motor will not start unless I shoot starting fluid into the spark plug holes. Once started the engine runs great. I took it out on the lake and ran it for about 2 hours with no problems. It starts right back up when warm but after sitting awhile it will not start up without doing the starting fluid routine. I have put in fresh 93 octane gas and new plugs. The primer bulb pumps up properly and gas is getting into the carbs. The battery is in good shape and the starter is fine. I have tried starting up using the electric choke and manually pulling out the choke. All my hose fittings appear tight with no air leaks. There must be something simple I am just missing.
One issue I also have is with the Pilot Screw settings. This may or may not point to my problem. According to the manual the pilot screws should be adjusted out 5/8 turn. With this setting the motor will start but runs very rough and shuts off. When I adjusted the pilot screws out to a little over 3 turns the engine runs great but will again will not start after sitting overnight. I have checked and rechecked everything. I am at a loss.
One issue I also have is with the Pilot Screw settings. This may or may not point to my problem. According to the manual the pilot screws should be adjusted out 5/8 turn. With this setting the motor will start but runs very rough and shuts off. When I adjusted the pilot screws out to a little over 3 turns the engine runs great but will again will not start after sitting overnight. I have checked and rechecked everything. I am at a loss.