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18hp Kawasaki has no spark


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#1 Minnow OFFLINE  

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Posted June 04, 2016 - 09:57 PM

I have a Kubota lawn tractor with a Kawasaki liquid cooled 18hp. It has over 600 hours with no problems. Today I went to cut the grass and started mower. It fired up and then died about 3 seconds later. Now dead with no spark. Starter is turning the motor but no spark. I'm guessing I have a coil issue or a bad switch like the one under the seat. It has Full transistor ignition. I'm not the best with electrical issues. Any advice would be a great help.
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#2 jms180 OFFLINE  

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Posted June 05, 2016 - 07:54 AM

do you have the Kawasaki engine model number handy



#3 Minnow OFFLINE  

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Posted June 05, 2016 - 01:43 PM

E/NO FD590V10848 or FD590V-BS108 Is all I see

Edited by Minnow, June 05, 2016 - 01:57 PM.


#4 olcowhand ONLINE  

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Posted June 05, 2016 - 01:51 PM

Likely the igniter gone bad if so equipped and there is a very weak spark. If no spark at all, then undo kill wire from coil harness then check again. If she has spark then, likely bad key switch or a faulty safety switch. If no spark period with kill wire undone, I'd say bad coil.
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#5 jms180 OFFLINE  

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Posted June 05, 2016 - 04:35 PM

Likely the igniter gone bad if so equipped and there is a very weak spark. If no spark at all, then undo kill wire from coil harness then check again. If she has spark then, likely bad key switch or a faulty safety switch. If no spark period with kill wire undone, I'd say bad coil.

I agree with cowhand


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#6 Minnow OFFLINE  

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Posted June 05, 2016 - 08:09 PM

Ok so I pulled the white wires off both coils and still no spark. So I'm guessing it's the ignighter. Any idea on a part number?

#7 Cat385B ONLINE  

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Posted June 05, 2016 - 09:43 PM

Denso 21119 2120 if it uses the same set up as JD uses.

image.jpg
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#8 olcowhand ONLINE  

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Posted June 06, 2016 - 07:30 AM

I believe this engine also has a pulse coil. It tells the igniter when to fire.
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#9 jms180 OFFLINE  

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Posted June 06, 2016 - 08:13 AM

I found a service manual for the Kawasaki FD590V and added to manuals section. I added it under engine section - Kubota


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#10 Minnow OFFLINE  

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Posted June 07, 2016 - 10:37 AM

I believe this engine also has a pulse coil. It tells the igniter when to fire.

It does show a pulse coil on the engine manual.  Any idea on a part number? 

Before I go an buy a few hundred dollars in parts, what's the best method and order to test the system for malfunctioning components. 

I also read that John Deere tractors with the same engine have a Time Delay Module # AM128906 that are problematic.  I'll be digging into the electrical system tonight and will report what i find.  Any technical advice on how to trouble shoot and test each component would be much appreciated.  

Thanks!



#11 jms180 OFFLINE  

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Posted June 07, 2016 - 12:24 PM

looking at wiring diagram on page 109 in manual check for 12 volts from key switch on o/w wire and good ground at b/w wire


Edited by jms180, June 07, 2016 - 12:25 PM.


#12 Minnow OFFLINE  

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Posted June 07, 2016 - 03:43 PM

Thanks jms180!  I'll let you know what I find. 



#13 Minnow OFFLINE  

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Posted June 08, 2016 - 12:07 PM

Hit a road block last night.  None of the parts are very accessible.  They are tucked inside the cowling/under the steering column.  Had to soak some bolts/nuts with PB Blaster and will go at it again tonight.  Didn't want to force anything and have bigger problems.  



#14 Minnow OFFLINE  

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Posted June 08, 2016 - 09:30 PM

looking at wiring diagram on page 109 in manual check for 12 volts from key switch on o/w wire and good ground at b/w wire

OK so I just tested the O/W and B/W wires and its getting 12v power and the ground is good.  BTW the igniter coil on this little baby is a Denso 21119-2157.  Does this confirm the igniter is bad?  If not do I move onto to the pulser coils? 

Thanks for all the help!



#15 jms180 OFFLINE  

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Posted June 09, 2016 - 07:15 AM

I would not think the pulser  coils would go bad. You could check them with a volt meter. They should put out a small amount of ac voltage as the magnet on the flywheel passes by the coil as the engine is spinning with starter. Not sure maybe around 1 to 1.5 volts ac but you should see some voltage reading as magnet passes by coil.






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