• 687-44555-00-00 90109-12M21-00 Engine Bolt Assembly | Genuine Used Part
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687-44555-00-00 90109-12M21-00 Engine Bolt Assembly | Genuine Used Part

687-44555-00-00 90109-12M21-00 Engine Bolt Assembly | Genuine Used Part

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🔧 Product Description

Genuine Yamaha Lower Side Mount Damper and Bolt - Part Numbers: 687-44555-00-00 / 90109-12M21-00

A genuine used Yamaha lower side engine mount with its mounting bolt for selected 40HP to 90HP two-stroke outboards. Part 687-44555-00-00 is the bonded rubber damper; 90109-12M21-00 is the associated mount bolt used on numerous bracket assemblies.

⚙️ Key Features

  • Genuine Yamaha lower side mount damper
  • Damper part number 687-44555-00-00
  • Mounting bolt part number 90109-12M21-00
  • Used on 40HP to 90HP two-stroke engines
  • Current damper supersedes earlier painted versions

🚤 Compatibility

Commonly used on

  • Yamaha 40HP, 50HP, 60HP and 70HP two-stroke outboards
  • Yamaha 75HP, 85HP and 90HP two-stroke mounting systems
  • Remote-control, tiller and selected Enduro variants

Typically suits

  • Confirmed model families include 60F / 70B / 70BETO and 90A / 90TLR
  • Catalogue use spans approximately the late 1980s through 2010s
  • 90109-12M21 also appears on 40, 50, 60 and 70-series bracket diagrams
  • Mount quantity and bolt position vary by engine
  • HP Range: Approximately 40HP - 90HP
  • Engine Type: Yamaha two-stroke outboard
  • Year Range: Approximately late 1980s - 2010s
  • Fitment Requirement: Confirm mount position, bolt shoulder and bracket diagram

🔌 Function

The bonded rubber damper supports the lower engine assembly and absorbs vibration and thrust loads; the shoulder bolt locates and clamps the mount.

⚠️ Common Signs of Failure

  • Rubber separated from the metal core
  • Mount bolt seized or bent
  • Excessive engine vibration
  • Clunking during acceleration or gear changes
  • Corrosion around the mount housing

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 687-44555-00-00 → Supersedes 687-44555-00-94
  • 687-44555-00-00 → Supersedes 687-44555-00-4D and 687-44555-A0-94
  • 90109-12M21-00 remains a separate Yamaha bolt reference

OEM / Related Numbers

  • 687-44555-00-00
  • 687-44555-00-94
  • 687-44555-00-4D
  • 687-44555-A0-94
  • 90109-12M21-00
  • 688-44511-00-00 related upper mount cover
  • 6H3-44552-03-00 related lower mount housing on later engines

Aftermarket / Verified Equivalents

  • No verified direct aftermarket bonded mount
  • Used genuine Yamaha mounts are the practical replacement
  • Equivalent high-tensile mounting bolts must match Yamaha dimensions, shoulder and corrosion protection

📦 Condition

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

Shipping & Delivery

Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.

Returns & Warranty

14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in the condition you received it for a refund or exchange. Full details in our Refunds & Returns policy.

Not sure this fits?

Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.

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