1986 Johnson GT 150HP Trouble

Give QL16V a try.

put a new 19p prop on from iboats. super fast shipping, anyways put new prop on put ql16v plugs in and adjust the throttle linkange to advance a couple degrees before the throttle plates open. still has alittle shutter on take off. just can't get this thing set right. now i'm back to maybe a fuel problem. carbs have been redone a total of 5 times with 2 carb kits with the last one being oem. new jets, new fuel lines, new primer bulb and 2 pumps. float are set to 7/8 drop and level when held upside down. Top end is running fine. I did hit 40mph according to my speedo. best it has ever ran.