How to replace thermostat kawasaki z13 - RTO 200cc Full Size Four Wheeler ATV

F1 is just an entry into the codes.

Help and service manual in the link

https://www.google.com/search?q=2012+kawasaki+teryx+f1+code

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Question moved to a better category.

Limp mode is normally activated to protect the engine and is ECU and Sensor driven.

Video and articles in this link.

https://www.google.com/search?q=98+Kawasaki+Prairie+400+limp+mode

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buy a replacement barrel and key off ebay,be lots easier

https://www.kawasaki.com/Accessories/Item/KAF400JHF/270050625

Check out this Kawasaki Universal Ignition Switch

9 Steps to Removing Motorcycle Ignition Switch DoItYourself com

Linda, looked for video on the wheel bearing replacement for your Kawi, no success. Check the attached links for your manual which would show how to change wheel bearing, I beleive the send link is a free manual. Good luck
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Kawasaki teryx Manual eBay
http://milatv.com/documents/manuals/2013%20Kawasaki%20Teryx%20Service%20Manual/99924-1434-06-Kawasaki-Teryx%20KRF750NA%202010-13.pdf
2010 Kawasaki Teryx 750 FI 4X4 Workshop Repair manual DOWNLOAD Download...

You might need a new thermostat, the temp switch may also have to be replaced.

Thermostats are cheap...start with that...it is the most likely to fail.

Its probably the head gaskets. When you do the compression test its not running and the holes in the gasket could seal up. When it gets hot a hole could appear in the gasket or even a crack in the head.
Its clear from the rising coolant levels that something is putting pressure into the coolant, do the bubbles in the coolant smell of fuel?