Part Number: 603-MR43LTS
AC Delco MR43LTS Spark Plug
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The AC Delco MR43LTS Spark Plug is a trusted OEM-quality replacement designed to deliver reliable ignition performance in a wide range of marine inboard engines. Engineered for consistent spark generation and efficient combustion, this spark plug helps promote smooth engine operation, dependable starting, improved throttle response, and optimal fuel efficiency on the water.
Marine engines operate in demanding conditions where moisture, heat, and extended periods of high-load operation can take a toll on ignition components. Replacing worn spark plugs is one of the most effective ways to maintain peak engine performance and prevent common issues such as hard starting, rough idle, hesitation, and loss of power.
Built to AC Delco's exacting standards, the MR43LTS features a durable design that helps resist fouling and corrosion while providing long service life in marine environments. Whether you're performing routine maintenance or a complete tune-up, this spark plug helps restore factory-level performance and reliability.
Common Engine Applications
The AC Delco MR43LTS spark plug is commonly used in GM-based marine engines, including:
- Indmar Monsoon 320
- Indmar Monsoon 325
- Indmar Monsoon 340
- Indmar Assault 310
- Indmar Assault 325
- Indmar 5.7L MPI
- PCM Excalibur 5.7L
- MerCruiser 350 MAG MPI
- MerCruiser 5.7L MPI
- Crusader 5.7L MPI
- Volvo Penta 5.7Gi
Common Inboard Boat Fitments
These engines are frequently found in popular inboard towboats and ski boats, including:
Supra
- Supra Launch 20SSV
- Supra Launch 21V
- Supra 22SSV
- Supra Sunsport 22V
- Supra Gravity Games Edition models
Moomba
- Moomba Mobius LSV
- Moomba Mobius XLV
- Moomba Outback
- Moomba Mojo
Malibu
- Malibu Wakesetter VLX
- Malibu Wakesetter 23 LSV
- Malibu Response LX
MasterCraft
- MasterCraft X-2
- MasterCraft X-15
- MasterCraft X-Star
- MasterCraft ProStar
Nautique
- Ski Nautique 196
- Super Air Nautique 210
- Super Air Nautique 220
Features
- Genuine AC Delco OEM-quality spark plug
- Designed for GM-based marine inboard engines
- Promotes reliable starts and smooth idle quality
- Helps improve fuel efficiency and combustion performance
- Corrosion-resistant construction for marine environments
- Ideal for routine tune-ups and preventative maintenance
- Direct replacement for compatible applications
Whether you're maintaining a wake boat, ski boat, surf boat, or tournament inboard, the AC Delco MR43LTS Spark Plug provides the dependable ignition performance needed to keep your engine running at its best all season long.