losing power after a few minutes

[Ecolandscaping17]

hey guys, need help.
losing power after mowing for a few minutes. hohler ech 749. changed coils, injectors, swapped clutches, battery is good and charging. compression is good. seems like it starts running on one cylinder but can't figure it out.

 

[squirrel.foe44]

hey guys, need help.
losing power after mowing for a few minutes. hohler ech 749. changed coils, injectors, swapped clutches, battery is good and charging. compression is good. seems like it starts running on one cylinder but can't figure it out.

sounds like a classic "gets worse as it warms up" or "losing a cylinder" scenario. Since you've covered a lot of the usual suspects, you need to start with valve clearance and a very thorough fuel system check (pressure at the rail, not just flow)

 

[tough.nut.fred]

Maybe a fuel delivery or ignition timing issue creeping in after it warms up, check wiring harnesses and connectors for heat related shorts or corrosion. then test the ECU or any sensors that affect cylinder firing once the mower is warmed up