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Black smoke...oil loaded in the heads. Blue smoke...too much fuel in heads. White smoke... Coolant in same. Check oil level to see if there's gas in the oil...If so, carburetor float is stuck open allowing fuel to flow into the cylinder heads.
 

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Grooty, You need to do one thing first. Do you know if the engine is a Kawasaki or a Kohler brand. When you know that, you need to know the engine code.. Like Kohler Command Pro Code" ECV/ECH749 or CH26S.
Next... log to...https://www.mymowerparts.com/
1. Click on the "Red Banner" on the webs site. "Repair Manuals"
2. Scroll down to Kawasaki -Service and Repair Manuals...if the engine is a Kawasaki. On that page it would show your engine code number.
3. If the engine is a Kohler. That is the next item down on the engine section. Again, it would show the engine code numbers.
4. When you have located the correct engine. scroll to you come to .Trouble Shooting" section. There you will find the causes why the engine won't start.
 

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On the engine housing near the bottom area that bolts to the frame, there is a Identification Label. It will show the engine code. It is between the frame and the right side part of the engine. Very difficult to see and read.
If it is a Kohler.
It will show the Model No. like 874
Engine Specification: like CV680-3028
Serial Number...………………….
Build Date: like 04/12/2016
 

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It could happen, but, I've never heard of a large horsepower engine...such as V-twin that have large key-ways and pins to shear or partially shear.
If it is a Kohler...older models. They installed the Smart-Spark system and it was trouble from the beginning. In 2019 they discontinued it and went to a better system.
 

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That is the one. You have a 2013 Kohler ECV/749 V-Twin EFI engine. But, I didn't know that Kohler made their engine in China. Not good.

OK, here is the site for the Repair manual. Scroll down to page 18 for 'Troubleshooting Tips" and pages 27 28 on the EFI systems.
sm_24_690_02.pdf (kohlerengines.com)
First, I would replace the Electric Fuel Injection fuel filter. It is due every 200 hours.
It also could be the Smart-Spark system that is causing the no start. Cost to replace...about $130.00
 

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The picture with the oil stick really doesn't show if the oil is one quart low or not. But, it appears it is a quart low.
With the new spark plugs installed, pull them now and if they are coated with oil as the old ones. If so, you have piston rings problem and oil is being pumped into the combustion chamber.
Did you replace the fuel filter?
 

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If those spark plugs are coated with oil, I would suspect the guide seals are gone and need replacing, which requires you removing the heads. Do this first, do a compression check...wet and dry that is if you have the equipment to do a cylinder compression check?
 
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