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I have an ex mark E series with a FS 600v
the engine has 1200 hours. The engine bogs down when i engage the blades, it takes about 5 seconds to recover to full rpms. The engine seems to bog down easily in tall grass. It seems like it has no power/tourque. Cylinders have 90
psi compression. It start very easily and runs fine, but it sound from the muffler is like it's running on one cylinder. Both cylinders are firing, plugs are new and firing. It does not smoke or burn oil. Total engine time is 1200.
Anyone have any ideas why it has no power??
Is it just worn out?

An engine with 1200 hours that doesn’t smoke or burn oil, has likely been well taken care of. I wouldn’t suspect is as being worn out. Based on your comments, there could be a restriction in the muffler. Or, my attention would turn to the governor. It may have some wear to a component internally, such as the ball guide or plate that covers the weights. The weights may be starting to groove the plate and are starting to get hung up in the groove.

txmowman said:

An engine with 1200 hours that doesn’t smoke or burn oil, has likely been well taken care of. I wouldn’t suspect is as being worn out. Based on your comments, there could be a restriction in the muffler. Or, my attention would turn to the governor. It may have some wear to a component internally, such as the ball guide or plate that covers the weights. The weights may be starting to groove the plate and are starting to get hung up in the groove.

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it was a landscapers mower. I. heck the things you talked about. Thanks for the replay

Look for dead spindle and idler bearings. Deck piled up with grass.

Plugs and coils fire easily in an open atmosphere, that is what often tricks people into thinking the parts are good. Under compression they can fail.

To test: Get the engine hot and running at high RPM, then use a spray bottle to shoot a stream water at each exhaust pipe near the head. If water burns off immediately, the cylinder is producing power. If the water burns off slow, there is a problem with that cylinder.

A common problem with V-twin engines is one coil will begin breaking down or totally fail when hot.

Looking at the hours, I suggest both coils be replaced. Be careful of their exact fit because they can be placed upside down.

Use a good parts source and not Amazon.

Part Tree and Jack's small engine are both good sources. Ebay is also good if you can get genuine Kawasaki parts. You have to read the seller description really well. Lots of junk online these days.

Plugs and coils fire easily in an open atmosphere, that is what often tricks people into thinking the parts are good.

Get the engine hot, then use a spray bottle to shoot a stream water at each exhaust pipe near the head. If water burns off immediately, the cylinder is producing power. If the water burns off slow, there is a problem.

A common problem with V-twin engines is one coil will begin breaking down or totally fail when hot.

Looking at the hours, I suggest both coils be replaced. Be careful of their exact fit because they can be placed upside down. Use a good parts source and not Amazon.