42970A2 Mercury Attenuator Plate | Genuine Used Part
42970A2 Mercury Attenuator Plate | Genuine Used Part
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🔧 Product Description
Genuine Mercury / Mariner Three-Cylinder Sound Attenuator Plate - Part Number: 42970A2
A genuine Mercury sound-attenuator plate used at the front of selected 65 Jet, 70HP, 75HP, 80HP and 90HP three-cylinder two-stroke outboards. It forms the base of the air-silencer assembly and also provides mounting points for throttle components and, on updated installations, the voltage regulator.
⚙️ Key Features
- Genuine Mercury / Mariner sound attenuator plate
- Correct current part number 42970A2
- Casting number commonly marked 42873-C4
- Used on three-cylinder two-stroke outboards
- Supports matching attenuator cover 42969A3
🚤 Compatibility
- Mercury / Mariner 65 Jet three-cylinder
- Mercury / Mariner 70HP, 75HP, 80HP and 90HP three-cylinder families where listed
- Commonly documented on 65 Jet, 75HP and 90HP models
- Approximate year range: 1987-2006, with some later catalogue applications
- Fitment controlled by serial number and attenuator-cover configuration
🔌 Function
The plate supports the air-silencer cover, reduces induction noise, carries throttle-related hardware and provides the correct air path into the carburettors.
⚠️ Common Signs of Failure
- Plate is cracked or warped
- Mounting studs or threads are damaged
- Attenuator cover cannot latch correctly
- Throttle components bind
- Regulator mounting point is damaged
- Increased intake noise or loose hardware
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 429705 → Superseded by 42970A2
- 42970T and 42970T1 are related service formats cross-referenced to the same plate family
- 42873-C4 is the casting number, not a service supersession
OEM / Related Numbers
- 42970A2
- 429705
- 42970T
- 42970T1
- 42873-C4 casting
- 42969A3 matching attenuator cover
- 4002217 washer, 39519 cup and related latch / throttle hardware
Aftermarket / Verified Equivalents
- No verified complete branded aftermarket plate
- Used genuine Mercury plates are the direct replacement
- Aftermarket gaskets and carburettor service parts are available separately
- Some stator / regulator conversion kits specifically require the later 42970A2-style mounting plate
📦 Condition
- Genuine used part
- Removed from running engine where applicable
- In good working condition unless otherwise stated
Shipping & Delivery
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
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?
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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