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54" lesco (cub cadet) with v-twin kawasaki hard to start

Discussion in 'Mechanic and Repair' started by dunaway.jesse@gmail.com, Aug 14, 2014.

  1. dunaway.jesse@gmail.com

    dunaway.jesse@gmail.com LawnSite Member
    Posts: 4

    My 54" lesco with v-twin ohv kawasaki engine (2x hp?) has gotten harder & harder to start. Last year it began not starting hot. It would usually start cold, but once got hot if you shut off would NOT start until cool. Once running will run ALL day with no missing, surging or anything. Occasionally when it starts it will throw a big burst of white smoke (very occasionally). Doesn't use any oil or seem to run rich when running.
    THis season I have not been able to get it started. Turns over fine but no start. Will try to fire up a few times but only a second or 2. I've pulled plugs & checked for spark, both have visible spark. Drained carb bowl, clean gas. Fuel supply is good to carb.
    What should I do next?
    I've been told to change the coils, but they don't break down & miss fire when hot. Don't want to spend the $100 if not necessary.
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  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Check to see the carb choke butterfly is closing FULLY when applied, Check the spark plug cable ends (inside boots) for rust/corrosion. Yes they can be rusty and show spark across a spark plug but cause a voltage drop and hard starting.

    You can replace the cable ends with some from any auto parts store if you cut the old ones off as close as possible.....
     
    Last edited: Aug 14, 2014
  3. dunaway.jesse@gmail.com

    dunaway.jesse@gmail.com LawnSite Member
    Posts: 4

    Choke is closing fully. No corrosion in boots. Got it to run last night after a lot of cranking. Ran it 5 minutes shut it off. Would NOT start back up
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  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    You may need to go deeper into the carb (clean/rebuild), Perform a leakdown/compression test and check valve clearences as well.

    Without engine model and spec numbers, Can't go any further.....
     
  5. dunaway.jesse@gmail.com

    dunaway.jesse@gmail.com LawnSite Member
    Posts: 4

    Fh680v
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  6. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    ^^^^^^^^^^^
     
  7. dunaway.jesse@gmail.com

    dunaway.jesse@gmail.com LawnSite Member
    Posts: 4

    I took the carb off and cleaned it. I found no alarming debris in the carb, nothing seemed to be plugged. It has gotten slightly easier to start.(backfires through carb while cranking) Will start cold in the morning, still won't restart if I shut it off through out the day. Starts best if I start it & run it every day. I let it sit 4 or 5 days & it took a lot more cranking. Always seems to start better with jumper cables attached.
    I've also noticed it does backfire a when I engage the blades.
    FH680V-BS29-R
    E/NO FH680VB40527
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  8. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    [​IMG] . ;)
     
  9. Kjrog

    Kjrog LawnSite Member
    Posts: 1

    Have the same issue. Kawasaki FH680V-BS29. What should compression be. Left cylinder is 55 the right 45. Can crank for 3 minutes and might get a backfire. Then I put the charger on on high boost and motor starts in under 2 seconds every time. Put in new plugs and new battery and still the same. Under high boost (14.8 volts) it fires up. With no boost 12.3 volts cranks forever and will not start!
     
  10. Uncle Knuckle

    Uncle Knuckle LawnSite Senior Member
    Posts: 400

    I've had anti-afterfire solenoids cause this condition due to the plunger sticking. Does your carburetor have a solenoid with one or two wires on the bottom of the bowl? If so, next time the problem rears its ugly head, remove the air filter and shoot a little carburetor cleaner directly in the carburetor throat and try starting the engine. If the engine starts right up and runs for a few seconds and then dies this tells you that you are not getting fuel through the carburetor. This will help determine if lack of fuel is the cause or if you need to keep looking.

    If your engine is equipped with the carburetor solenoid, perhaps the extra voltage from the charger is enough to make the plunger move.
     

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