Honda Outboards BF40A/BF50A Service Manual, Page 234Get this manual

HONDABF35A45A From the set angle to full open From the operation angle where the diaphragm is at the full stroke position to the fully open throttle, the throttle opener cam interconnected to the diaphragm via the assist spring operates, which is called the lost motion mechanism, and the diaphragm does not move further[5) [2]

DIAPHRAGM

THROTTLE OPENER CAM

[4] ASSIST PLATE

[3] Set angle

[6] Full open

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives