Had bike in for front tire, road it home an saw that the nut in between top of shocks ( 26mm) centre post, was right off. Do I have to loosen off top of shocks to tighten it down? Do you know what torque it should br? How would this come loose?

I would start at the top of the front assembly and work down.The easiest way to check for a loose or damaged head stock bearing is to put the bike up on the centre stand,have someone push down on the rear taking all weight off the front tire, and push the tire assembly in and out.There should be absolutely no play in the wheel assembly or headstock. The drop may have backed the head stock nut off just enough to loosen the assembly. I would also check to make sure there isn't a slight bend in the front rim.Check the brake caliper for clearance and don't rule out the tire it might have damage you can't see.You may have even bent the front axle slightly.This might explain why you only feel it slowing down or turning.Good luck

If the wheel has nuts (not bolts) on each side you just need to loosen each one enough to remove the wheel.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

The bottom mount is easy. It isn't easy to get the top. If you can get vice grips on the flat at the top of the stem where the nut holds the shock to the a arm and get the nut off consider yourself lucky. If you can get the nut loosened enough to get a blade in there you can use a sawzall/reciprocating saw to cut the shock below the nut and it will drop right out when the bottom mount is removed.

The only loosening mechanism should be the quick release, you should have your bike upside down, and place the wheel aligned into the shocks before you insert the quick release pin and nut.

Jack bike so front wheel is off the ground.
Push handlebar to left until front end starts to continue turn by itself.
When it hits the fork stop (rubber bumper), it should bounce to the right, fall back to the left, then bounce right one more time before stopping, somewhere around the center position.

Remove headlight nacelle.
Remove steering stem nut (on top of top triple clamp).

Under the top triple clamp is a star adjuster ring.
Tighten to decrease swing (tightening bearings).
Loosen to increase swing (loosening bearings).

Reinstall steering stem nut (60-80 ft/lbs).
Reinstall headlight nacelle.

There are two "shocks" underneath the bike. You need to loosen a large nut on each, and turn the shocks on the threaded rod an equal distance on each. You will need a special spanner for the turning the shocks I believe.
You have to get right down flat on the ground and look under the bike between the frame rails in front of the rear tire and you'll see them.

Easy, Quick and fun.
spray all the bolts with P.B. Blaster. wait a day or so....spray them again....wait.
Lift and secure the vehicle, Remove the front tires....
Loosen all the bolts carefully.
remove the  old and replace with new.
The front top shaft is tricky if the nut won't loosen easily.
I cut off mine with a hack saw because depending on the type  on shocks on there you won't be able to loosen the nut as the complete shaft turns
and  is enclosed in the shock body etc
The back is easier in that there are two bolts on top and two on bottom.
Good Luck