Honda Big Red (increase/decrease)???

[jcquads]

My 1985 Honda Big Red has a increase/decrease nut on the right side of the engine case.So what is this and what does it do?How does it work?
Getting a manual for it,but it is going to take awhile to get here.
Thanks

[Nick_R_23]

I think that would be the clutch adjustment nut. It adjusts how much the clutch is allowed to slip.

-Nick :TrikesOwn

[trizilla]

it is the clutch adjuster. it adjusts the freeplay of the clutch.if you messed with the screw you would notice varying freeplay at the shifter. this is straight from a service manual. "loosen locknut,turn adjusting screw counter clockwise until internal resistance is felt,then tun screw clockwise 1/4 turn,hold adjusting screw and tighten locknut"