Part Number: R44LTSM
AC Delco R44LTSM Spark Plug
Keep your marine engine performing at its best with the AC Delco R44LTSM Spark Plug. Designed for GM-based marine applications, this OEM-quality spark plug delivers reliable ignition performance, efficient combustion, and dependable operation in demanding boating environments.
A properly functioning spark plug is essential for smooth starts, responsive acceleration, fuel efficiency, and consistent power delivery. Over time, spark plugs can become worn or fouled, leading to hard starting, rough idle, reduced performance, and increased fuel consumption. Replacing them as part of routine maintenance helps restore engine efficiency and keeps your boat running reliably throughout the season.
The AC Delco R44LTSM is engineered to withstand the heat, vibration, and moisture common in marine applications while providing long-lasting performance and dependable spark generation.
Common Engine Applications
The AC Delco R44LTSM spark plug is commonly used in a variety of GM-based marine engines, including:
- Indmar Monsoon 310
- Indmar Monsoon 320
- Indmar Monsoon 325
- Indmar Assault 310
- Indmar Assault 325
- Indmar 5.7L MPI
- Indmar 350 MPI
- PCM Excalibur 330
- PCM GT-40 replacement applications
- MerCruiser 5.0L MPI
- MerCruiser 5.7L MPI
- MerCruiser 350 MAG
- Volvo Penta 5.7Gi
- Crusader 5.7L MPI
Common Boat Fitments
These engines are frequently found in many popular inboard ski, wake, and surf boats, including:
Supra
- Supra Launch 20SSV
- Supra Launch 21V
- Supra 22SSV
- Supra Sunsport 22V
- Supra Gravity Games Edition
Moomba
- Moomba Mobius LSV
- Moomba Mobius XLV
- Moomba Outback
- Moomba Mojo
- Moomba Mobius LS
Malibu
- Malibu Wakesetter VLX
- Malibu Wakesetter 23 LSV
- Malibu Response LX
- Malibu Sunsetter LXi
MasterCraft
- MasterCraft X-2
- MasterCraft X-15
- MasterCraft X-Star
- MasterCraft ProStar 197
- MasterCraft MariStar 225
Nautique
- Ski Nautique 196
- Super Air Nautique 210
- Super Air Nautique 220
- Nautique 216
Centurion
- Centurion Elite V
- Centurion Avalanche
- Centurion Air Warrior
Features
- Genuine AC Delco R44LTSM spark plug
- OEM-quality construction for marine applications
- Provides reliable ignition performance
- Helps improve starting, idle quality, and throttle response
- Supports efficient fuel combustion
- Designed to withstand harsh marine environments
- Ideal for routine tune-ups and preventative maintenance
Why Replace Spark Plugs?
Fresh spark plugs help maintain proper combustion, maximize engine efficiency, and reduce the risk of ignition-related performance issues. Regular replacement can improve fuel economy, restore lost power, and help ensure dependable operation every time you hit the water.
Whether you're maintaining a Supra, Moomba, Malibu, MasterCraft, Nautique, or Centurion powered by a GM-based marine engine, the AC Delco R44LTSM Spark Plug delivers the trusted performance and reliability needed for season-long confidence on the water.