idle difference on muffs vrs in water

[delsol]

i have a 135 76 johnson that i think has carb trouble i just adjusted the linkage its running at 1500 rpm on ear muffs when its in water is it possible it will lower the idle.....

 

[NathanY]

Re: idle difference on muffs vrs in water

It is possible that the idle will be lower due to the back pressure of the water on the exhaust, but I dont know if it is gonna lower it by 750rpms.

 

[22WRF]

Re: idle difference on muffs vrs in water

I idle should be set in the water and in fwd gear<br />or with a test wheel in place of the prop out of the water.