You need a repair manual if you are a do it yourselfer. It is fairly simple with the manual.
www.hdtalking.com/transmission_clutch_and_primary/3173-how_to_adjust_primary_chain_video.html
yes on the bottom of the primary
once inside the primary, loosen the compensator on the front and the clutch basket on the rear. lay them out take old chain off, then put them back on at the same time and correctly tighten then use slack adjuster to tighten
under the primary is a 3/4" lock nut, loosen that and adjust the screw by looking through the chain inspection hole. When tightened properly there should only by 3/8" vertical play in chain.
Adjust the sprocket of the chain
How to adjust timing chain Yamaha sr125
The engine in the Polaris Sportsman 500 is self adjusting. There is no need to adjust the timing chain on the Sportsman 500. If you are hearing the chain slap, it is time to replace the chain, not adjust it.
Timing chain as well as belt cannot be adjust. If the chain has got stretched you have to replace it.
you don't adjust, you replace
how to adjust the timing chain on a 1988 kz 305
You can't adjust the chain on an LT80. You can buy an aftermarket chain tensioner if you wish to do this. This is the only way.
To adjust the primary chain you remove the oval-shaped inspection cover on the chaincase, loosen (don't remove) the 9/16" nut that holds the chain tensioner in place and move the adjuster up or down to adjust chain tension. The chain should have 5/8" to 7/8" of up-and-down play at its tightest point when the motor's cold and 3/8" to 5/8" of play when the motor's hot. To adjust the rear chain, loosen (but don't remove) the axle nut and turn the adjuster nuts (on the ends of the swingarm) in or out an equal number of turns to obtain proper chain tension. The rear chain should have about 1/2" of up-and-down play at its tightest point.