1998 15 4 stroke lurching

woodspinner

Recruit
Joined
Feb 27, 2015
Messages
1
Local tech has worked on it with no luck. Running in a lake, lurches at low and high speed, at high speed, it will not run up to full RPM and the skipping increases to severe. 15 ft,l light boat max speed 8.86.
Tech found a slight after carb air leak, fixed it to no avail. He seems to be at a loss for ideas. HELP
 

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,345
Welcome to Iboats,

Which brand 15 HP 4 strokes outboard is it ?

Happy Boating
 

rejesterd

Petty Officer 2nd Class
Joined
Sep 20, 2018
Messages
142
Assuming it's not an air leak, then change the spark plugs. It could just be a bad plug. Inspect the condition of the old plugs. If the issue still occurs after installing new plugs, check the plug wires with a spark tester. If you have new plugs and they're all getting spark, then check for air leaks again with some brake clean or starting fluid. If you find no air leaks, clean the carbs. Then take it to another tech if it still doesn't run right.
 
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