OK here goes. I have a cub cadet volunteer with a fuel injected Kohler lh775. This was brought to me from another shop since they couldn't figure it out.
Here's their story.
came in for a water pump. tech pulled the intake and a few other misc parts and replaced the water pump. Reassembled and the motor was missing on cylinder 2. replaced several parts and just couldn't get it to run on both cylinders.
So in my shop we checked compression 155ish on both cylinders at wot. I can get the motor to start if I hold the gas pedal in just the right place but at low RPM's it very rough.
Pulled side cover and verified timing is correct and key ways are not sheared
turned over motor with injectors out and they spray evenly and the same. best I can tell by eye
installed new plugs and got motor to start and held it at higher RPM's for a few seconds. cylinder 1 plug is dark cylinder 2 is still new and seems damp with gas
switched coils from 1-2 installed new plugs again and same test with same results.
The other shop replaced the ECU and harness. No matter what parts I switch from cylinder 1 to cylinder 2 the problem stays on cylinder 2.
Any thought or ideas would be greatly appreciated