my fx600v 20 hp is using oil . When i start it there is a small puff of smoke and any thing over 3/4 throttle looks like we are trying to fog for...

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Hi Jay,

Did this problem started after you had an oil change?

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how many liters of oil did you put in to the engine? 

there might be an oil leakage past the valves into the cylinders. Its a burned oil. Pull the plugs and inspect for oil fouling.  

Alright. I will wait for your next message. 

Hi Jay,

Cant find the repair manual and it might not be available on the internet for public download. All i can find is the user manual. Please click the link below. 

http://www.kawasakienginesusa.com/sites/default/files/manuals/99920-2257-03_FX481V-541V-600V_English.pdf

Dear Jay , It was a pleasure helping you with your Kawasaki issue today. Here is a summary of the resolution.
Issue identified : engine exhaust producing smoke when started
Solution Implemented : chat with cx and he said he replaced the intake manifold gasket. told cx to check the coils and inspect for oil foiling. cx found one plug fouled. told cx to bring the unit to nearest repair shop for engine overhaul. Answer accepted. 
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Hi Jay,

You can contact discount online parts for the exact lawnmower parts that you need. Their phone number is ***-***-**** .

Here's the link to their website.

https://discountonlineparts.com/lawnmower/

Here's the valve clearance based on the manual.

Alright Jay.

let me know if you have further questions.