100 mph + get a 1000 cc sport bike ...been there done that......these vintage bikes are not made safe for that speed ....tires/spoke wheels agh
My bike was ridden 100 mph and more very often back in the days. Touring thru Germany, Italy or France was equal to 100mph and more most of the time. It happened that I had to keep 180-190 kph during a long period, the fuel vanished really quick!
I remember when the speedo showed 210kph with cases, fully loaded with 2 persons and luggage a little bit downhill and a looong nice curve from Austria to Italy, alps around, not letting a Jaguar XJS to pass me. The frame had some flex then when leaning and I started to think about the nuts holding front axle, did I really tighten them enough at last repair?
Photo below on one of those trips 1985. The alps behind in northern Italy close to Austrian border. As I wrote earlier, steering damper helps. I noticed that 4-1 give better handling, easier front wobble when switching from 4-1 to 4-4 that new tires solved.
The bike has much tougher acceleration now, cruising in 100 kph on 5:th gear, just twist the throttle and suddenly I'll get a corner thrown in my face, 180-190 kph is reached really quick. I have dual front brakes that almost match Mikes Billet block and 10005cc which made a huge difference torque wise compared with 836. 2 old friends were surprised last summer since they have to twist a lot to keep up with my CB750 K6 on curvy country roads when I accelerated from 70 up to 180-190 kph (110-120 mph)
Aprilia Tuono 4 cyl model 2017 which is a lot faster and Honda CBR1100XX Super blackbird -1996 with 133 rwhp left but no fairing making speeds over 210-220kph very unpleasant for my friend.
Std rear tire dim positive too. Changed from 120/90-18 to 4.0-18.
Bike (avatar) will get a Hindle 4-2-1 mounted this winter so I'll visit the other side of 200 kph more frequent next season!
I'll might test the megacycle
125-75 125-20 cam again. Now with correctly jetted carbs. That cam did not respect the red line at all with 836, quickly to the other green area around 10.000 rpm.
So, a Honda CB750 can handle speeds around the 200 kph (125mph) limit
Very important to keep the eyes open on all other people on the roads and be prepared for cars crossing the road and not seeing you. Avoid accidents by riding, not braking which is not the best part of the CB750
Shocks back in the 80's was Marzoochi AG Strada, needle bearings in swing arm, tapered roller bearings front. Same now except for IKON shocks, progressive springs in fork and better steering damper bracket on frame. This match the +30 kg extra I have got