40hp 1987 yamaha outboard motor will run for 30-60

Re: 40hp Yamaha oil mix?

50 :1
Yamaha recommends ringfree

have a look at you owners manual http://www.yamaha-motor.com/outboard...px?ls=outboard

If it's a 2-stroke, have those carbs cleaned...
Then check if he runs on all 3 cylinders.

hi my 40hp selectric outboard motor won't shut off by key and no speed once engage throttle full,also high reve on off position.

Remove Carbs And Clean Then Test Again

Hi have you tried it with the stop switchl/button disconnected, if so you have only got the stator under the flywheel left to replace, regards Phil.

I have a problem with my 2 stroke 20hp mercury 1989,when I run 10-90% throttle it's works fine but when in 100% its only runs in 90% and doesn't sound normal like it's not burning right.

My outboard motor is old and used.When I went to run it for the first time everything worked except when I went to put it in forward gear the boat went slowly but when I gave it more gas the engine just reved up but the boat wasn't going any faster.The motor is 40hp gale model.I think because it is bought used the prop is not the right one and it seems like it's slipping as I go faster.
I would appreciate any feedback on this problem.

Thax, Don

Sounds like a coil pack getting hot and breaking down

Mate.If the fuel hoes is no good,cut off about 1inch of hose and take to a hose supply shop.It will be cheaper than buying a 'real' part.Or take the whole thing.Make sure you tell them it's a fuel line to get the correct type of hose.Hope this helps