Hi guys, my 1982 Johnson 140 J140TLCNB is giving me grief. It's hard to start, doesn't want to idle in neutral but will idle in gear. Won't idle on muffs, it backfires and dies. Acceleration is poor but it will get up and go and seems to run ok, tops out at around 35mph. One spark plug is not oily, it's dry and cleaner than the others. I've just swapped the coil with another cylinder to see if the dry plug is caused by a bad coil.
I was blowing power packs and dropping a cylinder so took it to the shop to diagnose the electrical system, they found a broken spark plug lead to be the culprit. Everything else tested ok.
I checked reed valves which all looked like new.
I have a new fuel tank and primer bulb. Fresh fuel.
I rebuilt the top carb when chasing a fuel leak. Both carbs are clean. I opened them up today and noticed that while the top carb float is set correctly (I think, parallel with gasket when held upside down), the bottom carb has the float at an angle. See pictures. Also in the video you can see that when I cover the hole at the top of the carb and squeeze the primer bulb it squirts out fuel. The bottom carb will not squirt out fuel.
Is it misfiring because the bottom carb float is set too low and it's running lean? Or is the top carb float set too high and it's overflowing? I don't know whether it should or shouldn't be squirting fuel when I squeeze the primer bulb. Will post pictures and videos below.
https://youtu.be/upe-fnSUJKY
I was blowing power packs and dropping a cylinder so took it to the shop to diagnose the electrical system, they found a broken spark plug lead to be the culprit. Everything else tested ok.
I checked reed valves which all looked like new.
I have a new fuel tank and primer bulb. Fresh fuel.
I rebuilt the top carb when chasing a fuel leak. Both carbs are clean. I opened them up today and noticed that while the top carb float is set correctly (I think, parallel with gasket when held upside down), the bottom carb has the float at an angle. See pictures. Also in the video you can see that when I cover the hole at the top of the carb and squeeze the primer bulb it squirts out fuel. The bottom carb will not squirt out fuel.
Is it misfiring because the bottom carb float is set too low and it's running lean? Or is the top carb float set too high and it's overflowing? I don't know whether it should or shouldn't be squirting fuel when I squeeze the primer bulb. Will post pictures and videos below.
https://youtu.be/upe-fnSUJKY