1995 40 hp yamaha 2 stroke

[nomad1957]

motor will run fine in idle and motor revs up without no trouble when it is out of water. When,I put the motor in the water and it will crank up fine when i put the trottle forward or reverse it will not go (very slow) I put a new carb kit and change the filter, new gas check the lines. thank you for the help

 

[99yam40]

Re: 1995 40 hp yamaha 2 stroke

Carbs need to be disassembled and cleaned properly

 

[nomad1957]

Re: 1995 40 hp yamaha 2 stroke

thank you. I clean the carbs and use the kit that was sent to me and the motor is still doing the same thing. thank you

 

[99yam40]

Re: 1995 40 hp yamaha 2 stroke

Did you disassemble completely and soak in carb cleaner and blowout all passages and jets?
Did you do the link and sync adjustments like your manual states after reinstalling the carbs along with the pilots screw adjustments?

 

[nomad1957]

Re: 1995 40 hp yamaha 2 stroke

yes

 

[99yam40]

Re: 1995 40 hp yamaha 2 stroke

make sure it has good compression and spark, then make sure the timing is advancing properly.
If all that is good then look at the fuel/air ratio,do the carbs again sometimes it takes a few times to get all passages cleaned properly or maybe you have a vacuum leak somewhere

 

[nomad1957]

Re: 1995 40 hp yamaha 2 stroke

thank you so much for your time. I will try what you have said and try again. Thank you

 

[noelm]

Re: 1995 40 hp yamaha 2 stroke

kind of funny this should pop up, I was at my local dealer yesterday and he has 2 of the exact same model, doing exaclty this, and he has been unable to fix either of them yet, so there maybe some sort of common problem that needs to be sorted out by someone who knows them really well.