Pensacola Fishing Forum / General Discussion / Boat Repair - Questions, Answers and Suggestions / yamaha 40 hp 2-stroke / Latest Posts

RE: yamaha 40 hp 2-stroke

tri-haul — Tue, 01 Jul 2008 19:30:49 GMT

thanks double. the motor runs great. I just didnt want to ruin a good motor. i appreciate your comments.

RE: yamaha 40 hp 2-stroke

DOUBLE "D" & LV — Mon, 30 Jun 2008 22:28:24 GMT

the valve needs to be in the normal position for operation. Use the open position for pull starting the unit to open or activate the choke, then put it in normal. If you have a problem where the "choke" valve is not closing properly, then you can close it.

For starting the engine, use the primer bulb first. Then, turn the key to start the unit. It will take about 6 to 8 seconds to activate the enrichener and the engine will run. Do not use the throttle or the engine will not start or will take a while to start.

To test the oil operation, you can pull the oil line on the outgoing side of the oil pump and run the engine shortly to see if it pumps oil. There is an oil consumption test, but I have not seen one of these go bad. Yamaha's oiling system is very good on these engines.

yamaha 40 hp 2-stroke

tri-haul — Mon, 30 Jun 2008 19:30:47 GMT

i recently purchased a used '02 40 hp 2-stroke yamaha, and i dont have the owners manual. can anyone tell me what the setting should be for the enrichment switch i.e. normal, open, and closed. and if can tell me if there is a way to test the oiling system, it would be great, i would like to stay on top of maintenace.hopefully someone has an answer before i get a shop manual. thanks in advance.