64D-14721-20-CA 64D-14721-20-5B Yamaha Muffler | Genuine Used Part

🔧 Product Description

Genuine Yamaha Exhaust Muffler No. 2 - Part Number: 64D-14721-20-CA

A genuine Yamaha secondary exhaust muffler for selected 150HP, 175HP and 200HP V6 two-stroke outboards fitted with a 25.3-inch extra-long shaft.

This component installs in the upper casing below the primary muffler and forms the lower section of the exhaust passage. The -20 version is specifically identified for extra-long-shaft applications.

⚙️ Key Features

• Genuine Yamaha muffler No. 2
• Current part number 64D-14721-20-CA
• Supersedes 64D-14721-20-5B
• Designed for 25.3-inch extra-long-shaft engines
• Used with the matching primary muffler and upper casing

🚤 Compatibility

Commonly used on

• Yamaha V6 extra-long-shaft two-stroke upper-casing assemblies
• Standard carburetted and selected HPDI models

Typically suits

• Engine models:
• Yamaha 150AET extra-long-shaft models
• Yamaha L150AET
• Yamaha 175DETO
• Yamaha Z175GETOX
• Yamaha Z175TXR / VZ175 extra-long-shaft models
• Yamaha 200AET extra-long-shaft models
• Yamaha L200AET
• Yamaha LZ200NETO
• Yamaha Z200 / VZ200 extra-long-shaft models
• HP Range: 150HP - 200HP
• Engine Type: Yamaha V6 carburetted or HPDI two-stroke outboard
• Shaft Length: 25.3-inch extra-long shaft
• Year Range: Approximately 2001 onward, dependent on engine model and region

🔌 Function

Muffler No. 2 carries exhaust gas farther down the extra-long midsection while reducing exhaust resonance and noise before the gases exit through the lower unit and propeller hub.

⚠️ Common Signs of Failure

• Exhaust noise becomes louder or harsher
• Muffler is cracked, burnt or internally corroded
• Exhaust gases leak into the upper-casing cavity
• Gasket or lower seal is damaged
• Restricted exhaust flow causes reduced engine performance

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 64D-14721-20-CA → Supersedes 64D-14721-20-5B
• 64D-14721-20-5B earlier finish-coded muffler reference

OEM / Related Numbers

• 64D-14721-20-CA
• 64D-14721-20-5B
• 64D1472120CA
• 64D-45123-00-00 muffler gasket
• 64D-45375-00-00 seal damper
• 6E5-14711-01-CA related primary muffler
• 6E5-14737-00-00 muffler damper
• 6E5-45123-00-00 primary muffler gasket

Aftermarket / Verified Equivalents

• Aftermarket muffler gasket replacing 64D-45123-00-00
• Aftermarket seal damper replacing 64D-45375-00-00
• Specialist used or reconditioned 64D-14721-20 muffler
• No direct aftermarket muffler casting

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated