Throttle Adjustment???

[john530]

So i was given this '88 Evinrude 48SPL, and i know little about it. I put the motor on my boat then brought it to the lake for a test run which i was assuming i would have to make some adjustments. While on the lake it didn't seem to have the power it should, so i put new plugs in, check fuel filter and lines and then the same things. I've noticed that there is a rod coming from the lever where the throttle cable connects and that rod runs to the carb and pushes the carb open further as you give it more throttle. On the carb side of the rod there is a screw adjustment that you can unscrew to make the rod longer therefor opening the carb further. I lengthen the rod and it seems to open the carb alot further than before. I just don't know if thats ok to do, i mean obviously that can adjust for a reason i just want to know if thats what i needed to do.

 

[WHITENOISE]

Re: Throttle Adjustment???

You are correct. I had to adjust mine before. If you are already 3/4 or more open you can expect very minimal improvement. I would recomend a defog. Or, maybe even just putting some sea foam in the tank i believe it 1.5oz per gallon acts like a fuel stabilizer and cleaner would also help decarb the motor over time. Expect a little extra smoke but nothing excessive. Chech the sea foam web site for proper dosage, i think thats what i run the first tank of the spring.

 

[john530]

Re: Throttle Adjustment???

Nice, mine was adjusted all the way in so i adjusted it almost all the way out but not quite just to leave some room so i don't blow the motor. I expect a big difference in performance, but we will see. Thanks for the information.

 

[WHITENOISE]

Re: Throttle Adjustment???

Good luck, performance change should normally be moderate but you said your linkage was adjusted all the way in. When the carb is set right my butterfly is just about completely flat. Slightly vertical of level.