Final update I got the parts I ordered in the time they said they would be here.  Put it all together all the parts were the right ones.  Started it up for the first time and everything worked.   Being I bought it not running I didn't know if everything worked or not.  But it all works as it should.  So now just have to wait for spring to go give it a good try out. Again thanks for all the suggestions from everyone

Update After searching all kinds of cfmoto parts departments, ones I found and ones suggested by other members and a lot of adding and dividing, the least expensive place was mortch motors, which was suggested by doug80638.  Total cost for everything I ordered was $357.00 including shipping from china by Fedx.  This included a cyl.kit with piston, pin, rings.  Gaskets for head, cyl, tensioner, Cvt area. 4 valves and seals. Thermostat and housing. Timing chain, guides all three, tensioner.  Hopefully that is everything I need.  This came out to way less then anywhere else I found, even deals on eBay.  They had everything in stock I ordered, other places did not and would have had to get parts from several places.  Shipping looks like it will take 7 days which is as fast as places here.
Had texted with them to make sure parts would fit my machine which they confirmed.  Looking at parts numbers their parts numbers match cfmoto parts numbers for my machine so they should be correct. Time will tell. 
Now who can tell me where to order the unifilter for my machine?

Thanks for the welcome. Also thanks for the advice.  I will be doing just the top end stuff with timing chain and tensioner. Looking at the parts dealers in the forum I did not see one that had a cyl. Kit it was all individual.  Much rather find a kit so hopefully everything would match.  Found kits on eBay that are for a 500 with a 191r model engine.   Is my 2019 zforce trail 500 engine that design? Where do I find what design it is? Thanks

Hello new to cfmoto and this forum. Just bought a non running  2019 z force 500 trail.  Was told by the old owner that the technician he had look at it that it had been dusted and there was a hole in the head.  Upon inspection and top end tear down did not see hole in head,  did find timing chain loose for tensioner was broke, cylinder has some wear, one exhaust valve appears bent.  So would like to find a piston cylinder kit with cylinder, piston, rings,and gaskets. Also timing chain kit with tensioner.  Any suggestions on where to get parts? Are any of the kits listed on eBay of the right engine type and will they work? Did find dirt in the intake pipe after filter so will be getting a unifilter as suggested by all the posts.   Any and all advice will be considered and greatly appreciated. Thanks