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Sat, Aug 21, 10 at 3:35
| I have a JD425 with 20hp water cooled Kawasaki engine. It's always run strong. It intermittently started loosing a lot of power (bogging down) when mowing. I ran thru it and discovered that there's no spark on the right cylinder.
I've replaced both spark plugs & right coil pack. Piston goes up & down when turning motor by hand, & running with OHV cover off I can see that the valves open & close while running... just no spark about 95% of the time on the right side. I'm stumped. Any ideas? Thanks! |
Follow-Up Postings:
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| Don't know about Kawas but B&S & Kohler V twins use a coil for each cylinder. IF your Kawa is a V twin, might look into that. Walt Conner |
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| ***"no spark 95% of the time"*** Do you literally mean "no spark"? or are you saying "the cylinder is dead 95% of the time"? You replaced the "coil pack" for the right bank. Does the Kaw coil have a molded spark plug cable or do you have to transfer your old spark plug cable to the new coil? I only have the Kawasaki service manual for their FD671D thru FD791D engines, I don't know whether the JD proprietary engine is different, or not. The wiring schematic shows the ignition system to be a very basic "magneto type, flywheel powered, grounding wire kill" configuration. Both "kill wires" converge into a single circuit without any diodes. Therefore, if either of the kill wires were chafed and shorting to ground, it would affect both coils and not just the right bank. So, it kinda boils down to this, are you absolutely certain that you are in fact not getting spark when the cylinder is dead? Unless the old spark plug cable had to be transferred to the new coil, I don't see anything else that could kill the spark to the right bank without also killing the spark to the right bank. |
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| Did you ever figure this out? I have a 93 425 doing the exact same thing. I replaced the coil and plug wire. Still no spark on right side only. |
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- Posted by bill_kapaun Z8 Orygun (My Page) on Mon, Jan 28, 13 at 19:15
| As mownie stated- Are you sure it's no spark or just no run. Verify with a spark plug tester. Some twin engines have a 2 barrel carb, and if one jet is clogged, it only runs on one cylinder. |
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| Good words to verify the loss of spark. Really, these can be messy or actually really simple. If you have not already installed a new set of spark plugs, now is the time to do so. Save the old plugs --carefully comparing the deposits between the two. Does it run the same warm vs cold? BTw, your particular engine should be a 1 bbl carb |
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| Replace time delay module. About $20 from your dealer. |
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- Posted by bjlewis101 none (My Page) on Fri, Apr 26, 13 at 16:55
| I have the same problem as the original post and have troubleshooted. Was the problem corrected? If so how? Was it the time delay module or something else? |
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