'72 merc 1150 throttle shutter setting

[monk-monk]

when at idle, what should be the position of the throttle shutters, my throttle shutters are resting against the carb body throat or "venturi". when i used to tune a holley carb on my chevy, the throttle plates were to be set where the throttle plate was exposing about half of the idle feed hole...i see three holes at my throttle shutters...what is the relationship of these three holes with the throttle shutter position???

 

[achris]

Re: '72 merc 1150 throttle shutter setting

Throttle plates should be fully closed, all of them... Idle speed is then set by adjusting the ignition timing only...

Do you have a copy of the correct timing and synchronization adjustments?

Chris...........

 

[monk-monk]

Re: '72 merc 1150 throttle shutter setting

the Seloc manual is history...im getting the merc manual you suggested...im catching on pretty quick to this carb and timing thing...thanks to iboats...i've been studying all the adjustment points and now have a real good understaning of whats supposed to happen...one more question...is there a simple solution to making a test tank...thats about all i need at this point, a test tank!!!!

 

[achris]

Re: '72 merc 1150 throttle shutter setting

Cut the top off a 205 litre drum. Make sure you have a plan for draining it after.