Posts: 110
Location: Albertville, Minnesota | I just had the similar problem with my Johnson 4-stroke....but two cylinders out.....also a knock when at trolling speed. With a load (in water), couldn't get over 2200 RPMs....8 mph. So after some quick checks (plugs, fuel filter, etc.), brought it in....the knock freaked me out. Should mention without a load, she hummed awesome....no knock. It was a computer chip in the motor....isn't telling the cylinders to fire. Mechanically, I'm fine....thank god. But the chip.....$1500 new/found one used for $850. |
