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Honda GXV620

weak spark

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#1 inthehollar OFFLINE  

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Posted October 19, 2016 - 10:36 AM

Can anyone help me? I have a Hustler Fastrk z with a Honda GXV620 on it. I cannot get a strong spark on either plug.


I have done the following - new coils, new plugs, new plug caps, new rectifier, unhooked every kill switch on it and swapped the coils from cylinder to cylinder and then back again. I cannot get a good spark on either plug. I can get a spark testing light to light up but still a very weak spark at the plug.


Can the kill switch diode cause issues with a weak spark? I have unhooked the wires to the coil from the diode and still nothing.


Does the kill diode have to be hooked up and working properly to get proper spark?


I am beyond irritated!

#2 jms180 ONLINE  



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Posted October 19, 2016 - 12:59 PM

Robert@Honda can help. He usually hangs out at LawnWorld

#3 glgrumpy OFFLINE  


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Posted October 20, 2016 - 08:04 AM

Is there an oil  pressure sensor on these engines?  Maybe it is bad or wire off, or low oil?   Only had little honda 4hp's myself, they had that switch.

#4 massey driver ONLINE  

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Posted October 20, 2016 - 08:55 AM

When you say new coils , did you buy them new or are you talking about a used coil. The new coils come with the ign wire but not the caps if I remeber correctly.I had a 20hp v twin one time and it used to eat coils for some reason. The coils are on the outside of the flywheel and are always live.They need a ground to kill them. If you've disconneted all the wire's that run to the coils you should have good spark..

This maybe off the mark but does this mower have a electric clutch on it. The electric clutch can and will ground out the ign if its shorted.Try disconnecting the wire to the electric clutch to see if it will run.

#5 jimbobbillyray ONLINE  

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Posted October 20, 2016 - 04:11 PM

checked the ground wire/grounding on it yet?