www.hdtalking.com/transmission_clutch_and_primary/3173-how_to_adjust_primary_chain_video.html
You need a repair manual if you are a do it yourselfer. It is fairly simple with the manual.
The primary oil does three things. Lube the clutch. Lube the primary chain . And cool the stator. If Harley thought Dextron would do this, they would have recommended the use of it. Keep your Harley a Harley.
yes on the bottom of the primary
No Harley Sportster has ever had a cam chain. The camshafts are gear driven, directly off the crank. No tension adjustment required.
Chain too tight
remove rear tire ,remove bolt that holds swingarm, remome primary covers remove chain or belt depending what you are using ,installing is the reverse , note do over tighten new belt transmission seal will go .
Get the repair manual, follow the steps
What year model is this Harley or make. The oil in the primary is self contained. It's a 1982 FLHT shovelhead that shares engine oil for the primary chain. I'm removing the chain and replacing it with a belt so I need to block the lines off somehow
Older ones, yes. Newer bikes are belt driven to the rear wheel and chain driven on 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.
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.