I have a bad wobbly in the front end at 70MPH it's a 2004 Honda VTX1800N motorcycle.
All right, you got a wobble in the front end. Hondas built in America are all right I guess.
Look at the front axle. Lots of times, the axle can come loose or snap. Next, look at the bolts on the bottom of the forks. If they are loose, you'll get a wobble. You have a gas charged front end, so you might need to charge one side or the other up. It only takes about 3 psi, which you put in with a rig that looks like a hypodermic syringe. The gauge on the syringe will tell you when the pressure is right.
If that don't cure it, you got problems.
Next thing to look at will be the spokes. Pull the wheel, pull the tire off, and use a pair of pliers to check the spokes for tension. If you can shift 'em back and forth just a tiny bit, they are loose. If you don't have a dial gauge and a wheel block to make sure it is straight, take it to a shop that does. Do the back wheel while you are at it.
If everything is good on both wheels, then pull the triple crown (and that is a lot of work). There should be a Timken bearing in the top and bottom. There will be a shaft that should fit in very tight. If the shaft is loose or the bearings are rusty, that is the problem.
The very last thing to look at is the tire. If it has a hard side, soft side, or is out of round by more than 1/16 inch, the tire is the problem.