Hello, I have a zforce 550 and the timing chain is a little bit sloppy and it runs very bad. Where are the timing marks to align the camshaft gear and all the parts? Thanks in advance

[2015 Z Force 800 53/Trail EPS]

In that case you will want to replace the chain and the tensioner parts first. You will then set the crank on TDC, then the cam sprocket where these two marks are parallel to the deck surface.  That service manual will help.