2000-2005 Yamaha F40B Outboard Service Manual, Page 98Get this manual
CONTROL SYSTEM
ADJUSTING THE DASH-POT
Check: Dash-pot operation Engine stalls when quick deceleration -7 AdjustAdjustment steps (1) Install the tachometer onto the spark plug lead of cylinder #1
Tachometer VU-08036-A90890-06760
(2) Start the engine and allow it to warm up for several minutes(3) Keep the engine speed at 3,750 50 rl min(4) Turn the adjust screw until the dashpot plunger is just touching the lever