Front end hop/vibration 37 mph-44mph only, HELP!

[Ncstatecamp]

Im having a bit of an issue with the front end of my 72 CB750 having a bit of the shakes, like a addict quitting cold turkey. I only get the movements between 37ish/44ish (gps speedo). Its both a shake (side to side) and a hop (up and down)

New tires - Avon Roadrunners
New Seals/rebuild forks
New progressive fork springs
2 part Progressive rear shocks
New clean/aligned chain
New swing arm bushing
New neck Allballz bearings/seats (Checked for square, no binding)
Has fork brace (OEM front fender, chopped)
New Spokes (Trued to within spec)
Forks are even in tree
Air Pressure Good

My first instinct was lacing was improper but why would I get such a small range of hop
Second Instinct was that I was hitting a resonance in the fork springs or something so I went ahead and got progressive.

Im going nucking futs trying to figure this out, its really irritating b.c its at traffic cruising speed only. Above or below and I glide along smooth.

 

[hillsy]

Tyre out of balance?


Did you check / replace the wheel bearings?

 

[Hoosier Daddy]

Deja-vue?
http://www.dotheton.com/forum/index.php?topic=53393.msg599414#msg599414

 

[Cookie]

Wheel bearing or steering head bearing play?

 

[MOONDOGnyc]

Check your tire balance, then tire pressure. Then your alignment of your rear tire. Sounds odd, but trust me, it has an effect on the tracking.

 

[trek97]

steering bearing may be too tight.

 

[Ncstatecamp]

I just upped my air pressure a bit, no more wobble, still a bit of hop so im getting them balanced monday.