Mariner 75hp lost power - fuel problem?
Wondered if anyone could help. I've just brought a boat with a 2 stroke Mariner 75hp (4 cylinders) believed to be mid to late 80's, no oil injection. Took it out for the first time last night.
When i got in the water it would start but when i then put it into reverse the engine would dye. Eventually got going so could have just been a cold engine. However after running at near full throttle for 10 mins slowed down and was just chugging very slowly when the engine died. Wouldn't start again fo a long time. Eventually fired up, gave it some throttle, we started going then we lost power and the thing just stopped and wouldn't start again. I don't know much about outboards as it is my first boat but seems that maybe it could be a fuel problem - not getting through?. One thing i did notice is that when pumping the primer bulb, i believe it should get hard when full with fuel, but it doesn't seem to ever get hard - after a good few pumps it is just as soft as when i started. The only other thing is that i filled my fuel tank with 25 litres of fuel then went to add the oil but couldn't quite put 0.5 litres of oil in to give a 50:1 ratio as the tank was overflowing. Therefore the mixture might have been a bit lean, was going to add more oil when we had burnt a bit of fuel but didn't get the chance. Don't know if this could cause a problem.
Hope someone can help.