1973 50 hp

[Seth1904]

yeah i am having a problem my motor wont rev to wot when the control is placed all the way forward. it idles fine and if u manually open the butterflys the it will go wide open but when its running it wont go wide open when u use the controls to do it but when the motor is shut off or running with muffs on, it will go wide open just not whens its in the water any help any one could have i would greatly appreciate it thanks seth

 

[Daviet]

Re: 1973 50 hp

Are you saying that the linkage is not opening the carbs all the way or the carbs are opening but the engine will not rev up under load.

 

[Seth1904]

Re: 1973 50 hp

the linkage will not open the carbs all the way. i just dont understand why it the linkage will open up all the way when its on the muffs or when its not running

 

[Daviet]

Re: 1973 50 hp

So if you move the throttle lever all the forward, with the engine OFF, the throttle plates will not open all the way?

 

[Seth1904]

Re: 1973 50 hp

the butterflies will open all the way with the engine off

 

[Daviet]

Re: 1973 50 hp

OK, the throttle plates are opening all the way. You need to check the compression and spark. Those engines will run pretty good on one cylinder in a no load condition. When put under load they will not preform. If the compression and spark are ok, try squirting some fuel mixture into the carbs while under load, if it picks up you have a fuel delivery problem, carbs dirty, fuel pump or fuel lines plugged.