It would take overfilling the forks to almost full to lock them, and not much farther down to make them extremely uncomfortable.
I have a couple of F7's, an F5, two F9's, F8, F81m and F11, all have either straight 20W or 30W engine oils in the forks, none ride like a tank.
I also don't do the 'fill to a specification" fill. I just cover spring seat, cycle the tube until the oil gets all the way distributed into the fork, then, bring the oil level to one inch over the spring seat, no more oil. Works good.
I have seen stock, heavy later H2's (only a handful of them), and more then a few Z series bikes need the 40W oils.
The ONLY thing I have seen that messes up the works, no matter the bike they are fitted to, is AIR FORKS/AIR SHOCKS. Adding air was Japan's way of giving "adjustable spring pressure" to front forks and rocks when different riders, with different weights rode these bikes. Only positive thing I have seen with adding the air to the forks, and to rear shocks, is LEAKS, (OIL, AND AIR). That is why Progressive Suspension made the different fork springs they have for various bikes, so air didn't have to be used for a 400 lb American rider, vs a 110 lb Japanese one. Progressive even made rear shock change over kits for rear shocks, full kits that took the air bladders off the shocks, and added a better, real, live rear shock absorber, and a SPRING to them, how very clever.
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