Any johnson 48 owners? adjustments?W/PICS

Jbridered

Seaman
Joined
Jul 29, 2006
Messages
50
My johnson 48 runs fine but is really slow. Can anyone tell me if it needs adjustments by looking at the pictures. First pic is neutral and second pic it forward full throttle. Do the arrows need to be in line with the roller? Thanks for any info.
 

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HybridMX6

Senior Chief Petty Officer
Joined
Oct 22, 2008
Messages
676
Re: 93 johnson 48 adjustments?

Re: 93 johnson 48 adjustments?

How slow is slow, and what kind of boat is it on? How long have you had this boat/motor combo, and has it always been slow or just started? Need to know more details before any of us can make assumptions.
 

Jbridered

Seaman
Joined
Jul 29, 2006
Messages
50
Re: 93 johnson 48 adjustments?

Re: 93 johnson 48 adjustments?

19ft pontoon currently 11mph. I had a 1983 evinrude 50 with the same prop on the boat before and it did 21mph. Runs perfect just slow.
 

Jbridered

Seaman
Joined
Jul 29, 2006
Messages
50
Re: Any johnson 48 owners? adjustments?W/PICS

Somebody has to have a johnson 48. Just need someone to take a quick look at the linkage.
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: Any johnson 48 owners? adjustments?W/PICS

You cannot tell by a picture whether or not adjustment is needed. You really need a service manual for your specific engine. Now don't get all huffy on us for saying that. The adjustments you are wondering about are part of what's called a "link&sync" process. That process is many pages long in the service manual and obviously too long to type here. You don't start in the middle of this process and adjust one or two linkages as that screws up other adjustments. You start at the beginning and go to the end. What you should do is remove the air silencer, push the throttle wide open and then look into the throat of each carb. The throttle plates should be perfectly horizontal in the carb throat. If not, you need to do the link&sync. If they are correct, chances are you don't need to mess with the linkage. Those adjustments deal with idle and WOT timing and throttle pickup. Do it wrong and you can screw up a perfectly good engine.
 
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