Have a Husqvarna Z48F with a KT745 motor.  Recently it started running oddly as if it had a fuel problem.  Would act like it was under load and not making full power.  Let it sit for a minute and it would surge and pop and then run normally again.  Start mowing and randomly repeat the condition.
 
Took the carb off expecting possible crud in the bowl, but was clean.  Checked the fuel lines and fuel pump hose to the valve cover and that's all ok.  Then I noticed the ground wires to the coils had worn insulation and some broken strands as if something was rubbing on them.  The only thing that can rub on them would be the top cover, but I don't see any abrasion markings on the cover.  Mystery to me, but wondering if anyone has seen something similar.  The wires aren't broken and since they're grounds it looks like there's still enough there to let the thing operate, but trying to figure out what could have rubbed on them.  Has to be the cover though because this is the only thing that comes close to them and they're in a vulnerable location running across the top of the manifold.  This shouldn't cause the problem I'm having though since these wires are to ground out the coils to kill the motor, but just curious.
 

Don't know off hand but the wires should only reach so far.
 
With that said any metal cover could wear thru with little to no damage to the offending part..
 
I'd gently, or with another piece of wire, duplicate it and move it about and see where it touches..
 
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I put the cover on and peeked in there as best I could and it looks like there's a ton of room between the cover and the wires.  A Google search doesn't provide much about this as something others are experiencing, so I'm guessing not a common issue.  The cover is the usual plastic just about all engines come with now and with no signs of rubbing on the cover, it almost makes me wonder if the wires were like this when I bought the machine.  To be honest, it's almost as if the harness was not tied to where it should have been and the wires being somewhat in close proximity to the flywheel, were chewed by the flywheel.  One connector is worn nearly halfway through and I'm pretty certain rubbing on plastic would not have done this.  It was in for warranty service one time after I bought it, but nothing under the cover would have needed to be touched and I can't imagine it making it out of the factory in that condition.  So, it's still a mystery how the damage happened.

Someone, (even at he assembly plant), could have forgotten a zip tie or two.
 
The flywheel does push a LOT of air under that cover.  
 
I'd re-insulate, zip down wires *not super tight so they rub thru) and move on...
 
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Well, everything was tied in there as it should be when I took the cover off so I would almost bet that someone fired the thing up without the bundle tied and grounds not connected to the coils which let them find their way to the flywheel.  If the grounds are connected to the coils there is zero chance of them contacting the flywheel, so the thing had to have been run with them disconnected at some point.  My money is still on someone at the dealer having their head up their ass.
 

boutym
  My money is still on someone at the dealer having their head up their ass.

That is very likely true and it sounds as if you found the culprit..   
 
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Ultimately my motor issue turned out to be a bad ignition module, but was not the result of the chafing.

Tks for the update!
 
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