Frame alignment / Geometry

[FastCletus]

I replaced the forks and triple tree on my cb 750 F 1980.  when I have been riding lately I notice I have very little front end feel, and just an overall awkward feel on the bike.  I maxed the air in the forks up to 16psi, and it made it a little better, but going into a turn something just feels odd

My question is since I replaced  the forks I have no idea on where to place the frame at on the forks?  is there a formula for me to determine how much I can lower the frame on the forks?  Currently the frame is all the way at the top of the forks  (excluding the thickness of the clip ons maybe an inch and half)

the pic is with the bike on the lift in the garage, so the forks are compressed a good bit by the tie downs

[FastCletus]

I ended up just relaxing the compression off the front and put it on center stand.  With 0 compression on front end it is about 4.25 inches from bottom triple to fork seal.  Will take it for a ride and see how it does

[shinyribs]

Do you have the fork tubes slid up past the top of the top clamp to mount the clipons? If you do that will cause a reduction in rake. Minimal,but still a reduction. Are the trees the same as the originals to the bike?

[FastCletus]

Whole front end is not original to the bike to my knowledge.  I think the forks are CB900 Custom.  Front has dual disc, and the fork diamter is 39mm, and it has the air valves on tip of the tubes

I lowered the bike on the fork tubes, and it helps, but what I have noticed is front compresses ALOT.  on a normal ride they compress 3.5 inches.  they front end is real mushy, and when riding on a bumpy road the bike will rock back and forth, and kind of makes it hard to handle

IF i were to think to fix it i would want stiffer front springs.  My question is , is this possible and if so whats a stiff spring?
OR am I better off buying a standard set of forks for the bike

[TOOLS1]

Try thicker fork oil, and more air pressure.
TOOLS

[shinyribs]

Thicker oil makes a big difference. My Sohc front end felt mushy with 10w in it so I tried some 15w. Too hard. 12w was just right for me with clubmans. Now that I have moto gp  bars and am putting less weight on the front end I went back to 10w. Firm, but still plush enough to not jar your elbows. You could also make spacers to compress the springs to tighten them up. Cheap test to see if you like it befoe you drop cash on new springs.

[FastCletus]

looked in the shop to see what oil was in the forks currently, but I have no leftover oil so I cant remember what I put in it.  I am definitely going to put 15w in there.  I really want feeling from the front.  

Thanks