Bench setting isn't the same as dynamically setting the carburetors. Honda sells a tool that should be under $20...It works on about everything starting in 1978-9. Everything with the 8mm headed nut & straight-blade screw in center. I've been retired since about the turn of the century, they may have brought out machines with different adjusters by now.
I remove the tank and place an old towel across the area above the air filters on my a. I strap the tank down and use a longer fuel hose to reach the carbs. Then like 80cb400t I shut the motor off and go to wide open throttle to reach the screw.
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