Champion L78V Marine Spark Plug | #833M | 4-Pack | 2-Stroke Outboard
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Reliable Ignition for Marine 2-Stroke Engines — Hotter Heat Range.
The Champion L78V is a marine-grade spark plug for 2-stroke outboard engines, sold in a convenient 4-pack. Part number 833M, the L78V runs one heat range hotter than the L76V — making it the right choice for engines that run cooler or at lower average RPM, where a hotter plug helps burn off carbon deposits and maintain a clean electrode.
Champion's V-series copper core construction delivers reliable heat transfer and consistent spark performance across a wide range of operating conditions. Always verify fitment against your engine's owner's manual or Champion application guide before ordering.
Key Features
- Champion L78V marine spark plug — 4-pack (Champion #833M)
- One heat range hotter than the L76V — suited for cooler-running or lower-RPM 2-stroke applications
- Copper core electrode for reliable heat transfer and consistent spark
- Designed for 2-stroke marine outboard applications
- Champion V-series construction for dependable ignition performance
Compatible Applications
- Mercury and Mariner 2-stroke outboard engines specifying Champion L78V or equivalent
- Evinrude and Johnson 2-stroke outboard engines specifying Champion L78V or equivalent
- Cooler-running or lower-average-RPM 2-stroke marine engines where a hotter plug is specified
- Verify fitment using your engine's owner's manual or the Champion spark plug application guide
Parts Desk Insights
The L78V is the hotter sibling of the Champion L76V — if your engine specifies the L78V, use the L78V. Substituting a different heat range plug can cause fouling (too hot) or pre-ignition (too cold), so always match the plug to your engine's specification. If you're seeing heavy carbon fouling on your current plugs, a hotter plug like the L78V may be appropriate — but confirm with your engine manual or a marine technician first.
For other Champion marine spark plug options, see the Champion QL77JC4 #828M or the Champion QL78YC #938M. For NGK alternatives in the same heat range family, see the NGK BR8HS.
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.