Kawasaki FD750D-AS04 running poorly

[Auto Doc's]

Maybe they did not have the throttle wide open (high) and choke fully open? Need to retest to verify. For both cylinders to be low would be unusual.

 

[ILENGINE]

Auto Doc there is no way of knowing how long this engine has been acting up. Maybe it hasn't been running correctly for several years. And what I have been reading makes it sound like sudden low compression and loss of power and shutting down is more common that you would think. Several people that tore down the engine reported stuck rings. And this engine has symptoms of being an oil burner. #1 cylinder shows signs of oil burning on the plug I took out with oily residue on top of both pistons when examined with a borescope.

I also have a Kawasaki Mule 3010 with the FD620D that is showing similar issues at the shop. If I get a chance tomorrow will rerun compression on the 750 and check compression on the 620

 

[Auto Doc's]

Auto Doc there is no way of knowing how long this engine has been acting up. Maybe it hasn't been running correctly for several years. And what I have been reading makes it sound like sudden low compression and loss of power and shutting down is more common that you would think. Several people that tore down the engine reported stuck rings. And this engine has symptoms of being an oil burner. #1 cylinder shows signs of oil burning on the plug I took out with oily residue on top of both pistons when examined with a borescope.

I also have a Kawasaki Mule 3010 with the FD620D that is showing similar issues at the shop. If I get a chance tomorrow will rerun compression on the 750 and check compression on the 620

Hello ILENGINE: For Horizontal shaft engines, I use a 5/50 mix of ATF and Acetone, put the pistons at about the halfway point, pour in the mixture and reinstall the plugs finger tight. Let the mixture creep in for about a day, then remove the plugs a purge the cylinder by cranking the engine. From there check the oil level, because it will likely be high. Change the oil and filter then install the plugs and fire it up. I have freed up a lot of carbon stuck rings in horizontal shaft engines using this method. Vertical shaft engines are a little more difficult and it takes a couple of times with the mixture while jacking the mower up high on the engine end to get as much saturation in the cylinder(s) as possible.

 

[ILENGINE]

I also have a Kawasaki Mule 3010 with the FD620D that is showing similar issues at the shop. If I get a chance tomorrow will rerun compression on the 750 and check compression on the 620

Checked compression on both the 750 and the 620 The 750 is reading 125-130 on both cylinders hot. For comparison the 620 is reading 170 on #1 and 220 on #2. The Mule is having intermittent issues with the valve in the electric fuel pump which didn't act up the day I was doing the initial testing on the no start issue.