Hi Gregory.

I own an NTV650,same as the Deauville minus the fairing.Assuming you've all ready removed the fairing.

If you look under the main frame rail.The vacuum take off point.For the front cyinder is found .On the right hand side of trhe bike,on the inlet stubb in front of the carburettor.It's a small allen key.

The rear cylinder take off point is found on the left side of the bike.On the inlet stub,in front of the rear carb.

You'll need to remove the tank,& you'll need a very long screw driver.To reach the ballance scew.Is down the hole in the middle of the air box.

Hope this helps.

Steve.