Sierra MP40970-1 Emergency Engine Cut-Off Switch & Lanyard – Retrofit Kit
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Sierra MP40970-1 Emergency Engine Cut-Off Switch & Lanyard – Retrofit Kit for Older Boats
Add a critical safety feature to any boat that wasn’t originally equipped with an emergency engine cut-off switch. The Sierra MP40970-1 is a complete retrofit kit designed specifically for older vessels — it includes everything needed for a clean, functional installation right out of the box. The coiled lanyard clips to the operator and connects to the switch at the helm. If the operator is separated from the controls, the lanyard pulls free and immediately stops the engine, preventing dangerous runaway situations.
The kit includes a coiled lanyard, the switch assembly, and all hardware for installation, along with fully illustrated instructions that make the job straightforward even for first-time installers.
Key Specifications
- Part Number: 11-MP409701
- Kit Contents: Emergency cut-off switch, coiled lanyard, all installation hardware, illustrated instructions
- Design Purpose: Retrofit installation on boats not originally equipped with an engine cut-off switch
- Function: Pulls lanyard to instantly stop engine and prevent runaway
Compatible Applications
- Older powerboats, runabouts, and outboard-powered vessels without a factory-installed engine cut-off switch
- Any boat where adding or upgrading helm safety equipment is required
- New safety installations where a complete kit with hardware and instructions is preferred
- Vessels undergoing safety compliance upgrades
Parts Desk Insights
The MP40970-1 is the right choice when you’re adding an engine cut-off switch to a boat that never had one — the complete kit with coiled lanyard, hardware, and illustrated instructions makes it a true plug-and-play retrofit. The coiled lanyard is a practical upgrade over a straight lanyard for helm setups where cord management matters. If your boat already has a switch body in place and you only need to replace the lanyard, the Sierra MP40960 Cut-Off Switch with Lanyard is the conventional/magneto-compatible alternative. For engine-specific replacement lanyards only, the Sierra MP28880 for Johnson/Evinrude covers that application. For a universal panel-mount kill switch kit with multi-key lanyard options, the Sea-Dog 10-Key Universal Kill Switch or Sea-Dog 7-Key Universal Kill Switch are full-assembly alternatives.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.