MY 90 will do 100 mph. I had to switch to air pods and 135 mains in both carbs and raise slide needles all the way up. The biggest problem is the ignition timing. My 86 has a max advance of 36 degrees vs the 28 max in the 90. With the same air box and jetting changes the 86 will leave the 90 in the dust and has a top end over 100 mph. You willing to avoid deep water crossings, clean the air filter often and drop your mpg to 45 to go 100 mph? you cant have everything. thumpthump
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