weak spark on Kawasaki 18hp

Discussion in 'Mechanic and Repair' started by MowerMinister, Mar 20, 2013.

  1. MowerMinister

    MowerMinister LawnSite Member
    Posts: 9

    I've switched the coils around to see if the coil pack was the issue. It was an issue but even replacing the bad coil with a new one hasn't cured my ills. I'm still only running on one cylinder no matter which coil I put where. My left (driver's side) cylinder is still not firing. I have spark now but with the engine at full throttle I can pull the left spark plug wire off and nothing changes at all. The rods look fine. The valves look decent but I need to check the seating to be sure.

    the original spark plug on that side was covered in carbon deposits but I've replaced both plugs for good measure.
     
  2. MowerMinister

    MowerMinister LawnSite Member
    Posts: 9

    I've switched the coils around several times and it makes no difference. One coil was bad but I've replaced it so I'm sparking on both cylinders now but I'm still only running on one cylinder. The left (driver's side) cylinder is dead. I've checked compression on both and all is well. I've replaced both plugs. The original left side plug was covered in carbon deposits but now its got a brand new one. The rods look fine and the valves look good too but I still need to check to make sure they're adjusted properly. I'm stumped though. All of my carburetor gaskets appear to be fine too. I'm running out of ideas.
     
  3. herler

    herler LawnSite Fanatic
    Posts: 5,144

    You could unhook the hose at the carburetor end and see if fuel comes flowing through.

    I know it probably won't fix things but it's one more step to take.
    Or just for kicks, replace fuel lines and fuel filter.
    Eliminates the possibility of a fuel transport clog.
     
  4. BigFish

    BigFish LawnSite Gold Member
    Posts: 3,169

    I haven't tried that.....might could work, if the coil is OK otherwise.
     
  5. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    You can't be stumped until you go down the list of possibilities and eliminate each.....

    Stick a screwdriver in the spark plug hole touching the piston to verify your at top dead center compression stroke, This will also show you if a rod broke causing zero compression.


    I mentioned spraying carb cleaner around the intake manifold where it bolts to the cylinder head while running, A carb gasket issue would effect both cylinders......
     
  6. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    Fish...next time I come across a Kaw coil with a bad diode...I will try adding a diode in the kill wire..

    RestroRob....you can spoonfeed the info to most of them...but....for some of them....
    Anything short of a Vulcan Mindmeld won't help..:dizzy:
     
  7. larryinalabama

    larryinalabama LawnSite Fanatic
    Posts: 16,777

    I had a "casting" plug come out of the carburator of my 16hp kawasaki, it did all kind of crazy stuff like your describing.

    Probably not the "book" fix, but i took a split lead fishing weight and filed it to size and tapped in hold and put a little jbweld on top of it.
     
  8. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    Funny you mention, I was sit'n here earlier wish'n I could be washed ashore next to a bottle like Captain/Major Anthony "Tony" Nelson......
     
  9. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    Not sure about the getting washed ashore part...though I'm sure it'd prolly be better than not being washed ashore...
    I think I saw one of those bottles on Ebay...though as Dutch says..results may vary..:laugh:
     

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