Adjusting idle on a 48

[Maj92az]

92 48 spl.

Waiting on carb kits, new roller sleeve and then I'll have fresh everything... plugs, wires, lines...starting fresh but what I cant understand is how the idle is set...if there is always a tiny gap between the cam roller and carb butterfly...how is adjusting any screw "idle stop" changing the idle. I ask because I like to picture and understand the system as I go thru it.

while I have you here..what is evinrudes initial idle mixture screw setting. 1.5 turns out? 2.5?

Thanks.

 

[juno pierrat]

your lucky, factory video of sync-n-link for 89 and newer, at Brandons Garage Linkage Adjustments: 1989 and Newer 40, 48, 50 HP Johnson / Evinrude - YouTube

 

[Maj92az]

Thank you.. watched the video in the past and will again. Still wondering how it is effecting idle. It seems it only changes/moves the timing arm ehich reaches under the flyeheel.

 

[racerone]

At idle the throttle plates MUST be closed !-----If motor is in good condition it may still idle too fast.----The motor is then slowed to a nice idle RPM by retarding the timing.-----Idle timing is the point where throttle plates start to open.-----And there is the maximum timing advance.----Do not make any timing changes until you fully understand the concept !!