FR651V Backfire under load

BigHuey25

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Aug 27, 2023
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I’m working on my Kawasaki FR651V on a cub rzt50
It would start and run fine for about 10 minutes then die; I have 2 of these mowers (other one runs fine) so I swapped carbs; new fuel pump, new fuel filter, finally I found the problem it was the line going from pump to crankcase had a small nick in it. That was short lived lol. Put it back together ram for about 10 minutes and then it died but this time upon re-firing it has a hard time getting idled up then once pto engaged it backfires pops etc; spark on both cylinders, CYL1 doesn’t change a thing once unplugged. CYL2 unplugged kills it, pulled valve covers on 1- lashing is correct and no bent pushrods; kind of at a loss with this thing anyone have any ideas?
 

7394

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Sep 5, 2014
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Test # 1 coil
 

bertsmobile1

Lawn Royalty
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Nov 29, 2014
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Remove kill wire to coils & try again
If problem persists swap the coils over an d see if the problem swaps sides .
 
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