Zero Turn Mower Down on Power - Not Firing on all Cylinders

Last week we fixed up Paul's old Cub Cadet lawn tractor. This week we look at his new Troy Bilt zero turn lawn mower. It's about 6 years old and a few months back the Kohler 7000 series engine started to bog under load and seems to be missing horse power. The Kohler is a V-Twin engine and most likely a cylinder is down. Hopefully its an easy fix.

Zero Turn Model: Troy Bilt 17ARCBDT011 DOM:07/2017
Engine Model: KT725-3083
Engine Displacement: 725cc

Ignition Coil (32-584-06-S): https://amzn.to/453wP3G
Front Tires (13x5.00-6): https://www.tractorsupply.com/tsc/product/hi-run-wd1055-replacement-tire-13x500-6-4pr

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