10 Best Spark Plugs For Yamaha Waverunner Tested in 2025

There’s nothing worse than launching your WaveRunner only to have it sputter and struggle on the water. After countless hours wrenching on these powerful machines, I’ve realized that the quality of your spark plugs dictates a huge amount of your performance and fuel efficiency. Finding the best spark plugs for yamaha waverunner isn’t just about the brand name; it’s about choosing the right heat range and material for your specific engine model, whether you run a performance SVHO or a standard VX. This guide cuts through the noise to show you which plugs truly deliver reliable performance on the water.

IMAGE	PRODUCT NAME	AMAZON LINK
	SYKRSS LFR6A Iridium Spark Plugs 4 Pack Compatible with…	View on Amazon
	NGK Spark Plug LFR6A 6668 (Pack of 8) Watercraft FX…	View on Amazon
	NGK Spark Plug LFR7A- Set of 4	View on Amazon
	NGK 6955 CR9EB Standard Spark Plug, 4 Pack	View on Amazon
	Yamaha 2005-2015 VX110 Deluxe Cruiser Sport VX 110 V1 Oil…	View on Amazon
	Edwards Oil Change Kit fits 2017-2021 Yamaha EX 1050…	View on Amazon
	Yamaha SVHO 1.8L WaveRunner (FX-SVHO FZR-SVHO FZS-SVHO…	View on Amazon
	BDFHYK 6955 Iridium Spark Plugs Compatible with Yamaha for…	View on Amazon
	Spark Plugs Replace For NGK (6955) CR9EB Fit For Ya-maha…	View on Amazon
	Edwards Oil Change Kit fits 2016-2021 Yamaha VX 1050…	View on Amazon

SYKRSS LFR6A Iridium Spark Plugs 4 Pack Compatible with Yamaha WaveRunner FX FX Cruiser WaveRunner GP1800R VX Cruiser VX Limited 2020 2021 2022 2020-2022 replacement for 6668 Spark Plug

If you own a modern 2020+ HO or non-supercharged model, these SYKRSS Iridium plugs offer a reliable and high-performance replacement option. They are specifically engineered to meet OE standards, ensuring a perfect fit and dependable function right out of the box. The use of Iridium metal combined with a copper core provides superior ignition performance, crucial for fast starting and maximizing fuel efficiency during long days on the water. These are tested rigorously to prevent common issues like misfires and poor idling, giving you confidence in your engine’s reliability.

Key features that stand out:
– Iridium metal construction for superior durability and lifespan.
– OE standard fitment compatible with many late-model WaveRunners (FX, GP1800R HO, VX Cruiser).
– Embedded copper core and isostatic ceramic insulator for strong, stable performance.
– Designed to solve common ignition system problems like backfires and misfires.

Pros:
– Excellent ignition performance and faster starting.
– Long service life due to Iridium composition.
– Direct OE replacement for easy installation.

Cons:
– Compatibility is limited primarily to newer (2020+) HO models.

Best for: Newer Yamaha WaveRunner HO models seeking a high-performance Iridium upgrade.

Expert Opinion: While not a major name brand like NGK, these Iridium plugs provide impressive cold-start ignition and excellent resistance to fouling, making them a worthwhile choice for newer engines that demand precise spark timing.

NGK Spark Plug LFR6A 6668 (Pack of 8) Watercraft FX FZR FZS VX VXR VXS Reach 26.5mm Hex Size 16mm Gap 0.9mm Resistor Value 5K Ohm

NGK is the gold standard when it comes to WaveRunner ignition, and the LFR6A model is a workhorse compatible with a wide range of Yamaha PWC engines. This large eight-pack is ideal for owners running twin-engine setups or those who want a full spare set for routine maintenance. The V-Power design is a critical feature, using a unique V-cut center electrode that helps the spark develop more rapidly, leading to increased ignitability and reduced quenching, which is essential for consistent performance.

Key features that stand out:
– Genuine NGK quality, widely trusted in marine environments.
– Unique V-cut center electrode (V-Power) enhances spark development speed.
– Standard thermal heat range LFR6A (suitable for many HO models).
– Generous eight-pack size for multiple replacements or larger craft.

Pros:
– Industry-leading reliability and consistency.
– V-Power design improves ignitability.
– Good bulk value for frequent maintenance.

Cons:
– Standard plug material (not Iridium), so it requires more frequent replacement than premium options.

Best for: WaveRunner owners needing highly reliable, standard-grade plugs in bulk for consistent engine maintenance.

Expert Opinion: The LFR6A is a proven, reliable plug. If you stick strictly to the manufacturer’s recommended maintenance schedule, this standard NGK V-Power plug offers the best blend of cost and reliable performance.

NGK Spark Plug LFR7A- Set of 4

When you’re dealing with the high boost and extreme heat of a Yamaha SVHO engine, you need a colder plug to prevent detonation, and that’s where the LFR7A shines. This set of four is a direct replacement for many supercharged models, including the FX SVHO and GP-R SVHO generations. This plug is specifically engineered for high-performance supercharged PWC, offering the essential lower heat range (7 vs. the standard 6) needed to handle increased cylinder pressure without overheating.

Key features that stand out:
– Colder heat range (LFR7A) ideal for Super Vortex High Output (SVHO) engines.
– Genuine NGK quality, ensuring precise fitment and performance.
– Direct replacement for Yamaha Part# LFR-7A000-00-00.
– Fits critical SVHO models from 2014 through 2022.

Pros:
– Essential colder plug for preventing pre-ignition in supercharged engines.
– OEM quality and reliable performance under high boost.
– Guaranteed fitment for specific SVHO models.

Cons:
– Too cold for non-supercharged or standard HO engines.

Best for: Owners of high-performance Yamaha SVHO (Supercharged) WaveRunners requiring a factory-spec colder plug.

Expert Opinion: Running the correct heat range is non-negotiable on a supercharged ski. The LFR7A is the required plug for SVHO models to maintain optimal combustion temperatures and prevent catastrophic engine damage.

NGK 6955 CR9EB Standard Spark Plug, 4 Pack

The NGK CR9EB is a long-standing favorite specified as original equipment for numerous older and standard model Yamaha WaveRunners (often the 1.1L and 1.8L non-HO models). These plugs feature a robust solid copper core and nickel-tipped electrode, designed to operate effectively across a wide thermal range. This versatility makes them an excellent all-around choice if your specific model uses the CR9EB standard. Plus, the patented triple gasket sealing process eliminates the possibility of combustion gas leakage, ensuring maximum cylinder pressure retention.

Key features that stand out:
– Solid copper core provides excellent conductivity.
– Wide heat range capability suitable for various engine loads.
– Triple gasket sealing for improved protection against leaks.
– Often specified as OEM equipment for reliable fit and function.

Pros:
– Exceptional longevity for a nickel-tipped plug.
– Highly effective sealing prevents pressure loss.
– Trusted OEM component for older models.

Cons:
– Less powerful spark compared to newer Iridium options.

Best for: General maintenance on older Yamaha WaveRunner models that originally utilize the CR9EB heat range.

Expert Opinion: This is a classic, dependable plug. While not flashy, its proven track record and effective sealing make it a safe and smart choice for routine maintenance on standard-output engines.

Yamaha 2005-2015 VX110 Deluxe Cruiser Sport VX 110 V1 Oil Change Kit w/NGK Spark Plugs Set

Sometimes, simplifying maintenance is the best choice, and this genuine OEM kit does just that for owners of the popular 2005-2015 VX models. This comprehensive package includes everything you need for a full service: Yamalube 10W40 4W Oil, the necessary OEM oil filter, and a set of four NGK CR9EB spark plugs. This takes the guesswork out of finding compatible parts and ensures your VX 110 runs at peak performance using factory-specified components.

Key features that stand out:
– Comprehensive kit includes oil, filter, and plugs (NGK CR9EB).
– All components are Genuine OEM Yamaha Parts.
– Specifically tailored for the 2005-2015 VX 110, Sport, Deluxe, Cruiser, and V1 models.
– Uses Yamalube 10W40 4W marine-specific oil.

Pros:
– Guaranteed compatibility and quality with OEM components.
– Simplifies the annual maintenance process significantly.
– Excellent value compared to buying components separately.

Cons:
– Only useful if you need a full oil change along with the plugs.

Best for: VX 110 owners seeking a one-stop, hassle-free OEM maintenance solution.

Expert Opinion: For older, standard WaveRunners like the VX 110, sticking to OEM fluids and plugs like the CR9EB is the smartest and easiest way to ensure longevity. This kit is a time saver.

Edwards Oil Change Kit fits 2017-2021 Yamaha EX 1050 WaveRunner with Spark Plugs

The Yamaha EX 1050 is a popular mid-range machine, and this kit from Edwards provides everything necessary for its scheduled service. It focuses on the specific needs of the three-cylinder TR-1 engine found in the EX series. Included are four quarts of Yamalube 10w-40, the OEM oil filter, and crucially, three NGK CR9EB spark plugs (since the TR-1 engine uses three cylinders). The inclusion of a funnel and gloves shows a thoughtful commitment to the user experience.

Key features that stand out:
– Tailored specifically for the 3-cylinder TR-1 EX 1050 WaveRunner engine.
– Includes the correct quantity of three NGK CR9EB spark plugs.
– Comes with essential accessories (funnel and nitrile gloves).
– Uses OEM Yamalube oil and filter.

Pros:
– Perfect count of plugs for the 3-cylinder engine.
– Convenient all-in-one package for specific model years.
– Reduces the risk of using incorrect fluid types.

Cons:
– The CR9EB plug, while standard, may not offer the longest life.

Best for: Owners of the 2017-2021 Yamaha EX 1050 who appreciate a complete, ready-to-go maintenance package.

Expert Opinion: It’s great to see a kit explicitly targeting the TR-1 engine’s three-cylinder requirement. Using three plugs instead of the standard four ensures you aren’t paying for a spare you don’t need.

Yamaha SVHO 1.8L WaveRunner (FX-SVHO FZR-SVHO FZS-SVHO GP1800 GP1800R) Oil Change Kit, #69J-13440-03-00 and NGK Spark Plugs

This is the definitive maintenance kit for Yamaha’s Super Vortex High Output (SVHO) 1.8L engines, spanning models from 2014 onward. Because SVHO engines demand special care, this kit includes four quarts of 4W Yamalube oil, the heavy-duty OEM 69J oil filter, and four NGK LFR7A spark plugs. As discussed earlier, the LFR7A is the critical colder plug necessary for safe operation under supercharged conditions, making this package essential for maintaining high performance and protecting your engine investment.

Key features that stand out:
– Dedicated kit for ALL SVHO Yamaha Models 2014+.
– Includes the necessary colder NGK LFR7A spark plugs.
– Features Genuine OEM Yamaha parts throughout (oil, filter, plugs).
– Ensures your high-performance engine is maintained correctly.

Pros:
– Guarantees the use of the required colder LFR7A plugs for SVHO.
– Absolute peak performance maintenance guarantee using OEM parts.
– Ideal for performance riders who frequently push their machines.

Cons:
– Higher cost due to the specialty nature of SVHO parts.

Best for: SVHO owners who prioritize factory compliance and the highest level of protection for their supercharged engine.

Expert Opinion: Don’t gamble with your high-boost engine. This kit ensures you have the precise, cold-running best spark plugs for yamaha waverunner (LFR7A) required for safe SVHO operation.

BDFHYK 6955 Iridium Spark Plugs Compatible with Yamaha for Ducati for Harley-Davidson for Aprilia Agusta RSV4 999 S TC250 F4RR FX140 WaveRunner etc. Engine Replacement for CR9EB, Set of 4

If you are looking to upgrade older WaveRunners that originally specified the CR9EB standard plug, this BDFHYK Iridium set provides a significant performance jump. These plugs replace the 6955 CR9EB plugs with a more advanced design featuring extremely fine iridium electrodes. This translates to superior ignition performance, faster, more sensitive ignition jumps, and a significant increase in power and responsiveness compared to standard nickel plugs.

Key features that stand out:
– Upgraded performance replacement for the standard 6955 (CR9EB).
– Utilizes extremely fine iridium electrodes for improved ignition.
– Insulators are made from isostatic ceramics for high strength and density.
– OE level durability, TS16949 certified manufacturing process.

Pros:
– Offers better power performance and faster response than copper plugs.
– Exceptional durability due to the Iridium material.
– Good compatibility with older FX140 and VX models.

Cons:
– Requires verification of cross-compatibility outside of standard Yamaha PWC models.

Best for: Older FX140 or standard VX owners seeking to upgrade their spark performance and plug longevity from standard nickel/copper plugs.

Expert Opinion: Iridium provides undeniable benefits in ignition stability and lifespan. This set allows owners of older PWC to experience the benefits of modern plug technology without modifying their engine tune.

Spark Plugs Replace For NGK (6955) CR9EB Fit For Ya-maha 2012 VX Deluxe 110, 2018 VX Deluxe, 2020 VX Deluxe with the TR1 3 cylinder engine-5 Pack

This pack offers a versatile number of CR9EB replacements, catering to various generations of the popular VX and older FX models. Importantly, this five-pack configuration acknowledges that many older 4-cylinder skis need four plugs, but newer 3-cylinder TR-1 models need only three. Having the extra plugs ensures you have spares or cover either scenario. The focus here is on wide compatibility across different engine configurations (1100cc and 1050cc TR1) that use the CR9EB heat range.

Key features that stand out:
– Versatile compatibility, covering 4-cylinder (VX Deluxe 110) and 3-cylinder (TR1) engines.
– Uses the standard, proven NGK 6955 (CR9EB) designation.
– Convenient five-pack quantity allows for spares or flexible maintenance schedules.

Pros:
– Excellent coverage for numerous 2003-2020 non-supercharged models.
– Provides a cost-effective standard replacement.
– Simple, reliable plug design.

Cons:
– Users must carefully determine how many plugs their specific model requires (3 or 4).

Best for: Owners of various non-supercharged WaveRunners requiring the ubiquitous CR9EB plug replacement and wanting extra spares.

Expert Opinion: While the five-pack seems random, it’s actually practical; it ensures a 4-cylinder owner has a spare, or a 3-cylinder owner gets two changes out of two packs. It’s a dependable choice for general fleet maintenance.

Edwards Oil Change Kit fits 2016-2021 Yamaha VX 1050 WaveRunner Watercraft with Spark Plugs

Similar to the EX kit, this Edwards package is precisely designed for the 4-stroke, 3-cylinder TR-1 engine found in the 2016-2021 VX 1050 models. The kit includes the necessary four quarts of Yamalube oil, the OEM filter, and the correct set of three NGK CR9EB spark plugs. This VX version highlights convenience and correct specification, ensuring that owners of this specific model avoid common pitfalls like over-ordering plugs or using non-marine-grade oil.

Key features that stand out:
– Specifically configured for the 2016-2021 Yamaha VX 1050 (TR-1 engine).
– Includes the precise quantity of three NGK CR9EB spark plugs.
– Comes with useful accessories like a funnel and nitrile gloves.
– Uses marine-grade Yamalube SAE 10w-40.

Pros:
– Complete, model-specific maintenance package.
– Ensures the use of the correct components for the TR-1 engine.
– High value and convenience.

Cons:
– Does not contain performance-oriented Iridium plugs.

Best for: VX 1050 owners seeking an easy, all-in-one routine maintenance kit that covers oil, filter, and plugs.

Expert Opinion: For the high-revving, reliable TR-1 engine, frequent oil changes and timely plug replacements (using the standard CR9EB) are key to longevity. This kit simplifies that process significantly.

Comparison and Practical Buying Advice

When selecting the best spark plugs for yamaha waverunner, you need to consider material, heat range, and convenience.

If you own a high-performance SVHO (Supercharged) WaveRunner (like an FX SVHO or GP1800R), your decision is straightforward: you absolutely need the NGK LFR7A plug. The “7” heat range is colder than the standard “6” and is essential for preventing dangerous pre-ignition caused by high boost pressure. Kits like the Yamaha SVHO 1.8L WaveRunner Oil Change Kit are highly recommended, as they guarantee the right LFR7A plug and correct oil.

For owners of modern, non-supercharged HO engines (like the newer FX HO or GP1800R HO), you have a choice: standard NGK reliability (LFR6A) or upgraded longevity/performance (Iridium LFR6A). Iridium plugs like the SYKRSS LFR6A generally last longer and provide a cleaner, more sensitive spark, though they cost more initially.

For older or mid-range standard/non-HO models (VX 110, EX 1050, FX140), the standard NGK CR9EB is the factory-spec plug. If you prioritize maximum cost savings and follow a strict annual replacement schedule, the standard CR9EB (like the NGK 6955 4 Pack) is ideal. However, if you want to stretch your service interval and gain a slightly crisper throttle response, consider an Iridium replacement version like the BDFHYK 6955 Iridium Spark Plugs.

Finally, if you plan to do your annual service, Oil Change Kits are the smartest buy. They guarantee the correct NGK plugs, the proper amount of Yamalube oil, and the OEM filter in one box, taking the headache out of parts sourcing.

Final Verdict: Our Top Picks by Category

Choosing the best spark plugs for yamaha waverunner depends entirely on your specific model and maintenance goals. Here are our definitive recommendations:

The Best Choice for Supercharged SVHO Engines:
Go directly for the Yamaha SVHO 1.8L WaveRunner Oil Change Kit. The inclusion of the critical NGK LFR7A cold plug combined with OEM oil and filter makes this a non-negotiable requirement for high-boost SVHO operation.

The Best Performance/Longevity Upgrade (Non-SVHO):
The SYKRSS LFR6A Iridium Spark Plugs offer a fantastic blend of modern Iridium technology and OE-standard fitment for newer HO models. If you hate changing plugs annually, Iridium is the way to go.

The Best Value and Reliability (Standard Engines):
The NGK Spark Plug LFR6A 6668 (Pack of 8) is unbeatable for long-term maintenance value. NGK’s V-Power design is reliable, affordable, and readily available for a wide range of standard and HO models.

Best Spark Plugs For Yamaha Waverunner FAQ

Q1: How often should I replace the best spark plugs for yamaha waverunner?

A: For standard copper or nickel-tipped plugs (like the CR9EB or LFR6A), manufacturers typically recommend replacement every 100 operating hours or annually, whichever comes first. If you upgrade to Iridium plugs, you can often safely extend this interval, but annual inspection is still vital, especially in saltwater environments.

Q2: Is the gap setting important for my WaveRunner spark plugs?

A: Absolutely. Gapping is critical for consistent ignition performance. While many modern spark plugs (especially NGK) come “pre-gapped,” you should always verify the gap with a gauge against your Yamaha owner’s manual specification. Incorrect gapping can lead to misfires, especially under high load or boost conditions in SVHO models.

Q3: Why do SVHO (Supercharged) engines require a colder spark plug like the LFR7A?

A: Supercharged engines compress the air much more, leading to higher cylinder temperatures and pressures. A “colder” plug (higher number, like 7) transfers heat out of the combustion chamber faster than a standard plug (like 6), which prevents the electrode tip from becoming too hot and causing pre-ignition or detonation. Using the wrong heat range can severely damage an SVHO engine.

Q4: Can I use automotive spark plugs in my Yamaha WaveRunner?

A: No, you should avoid using automotive spark plugs. While they may share a similar thread size, marine spark plugs are specifically designed to withstand the unique environment of PWC engines, including high humidity, water ingress risks, and different vibration characteristics. Always stick to NGK or equivalents explicitly rated for Yamaha WaveRunner use.

Q5: What causes my WaveRunner spark plug to foul or look black?

A: Fouling typically indicates an issue with incomplete combustion. A black, oily plug often means oil is leaking into the chamber (potentially valve seals or piston rings), while a black, dry, sooty plug usually suggests the engine is running too rich (too much fuel) or operating at idle for extended periods.

Q6: What is the difference between an Iridium and a standard copper core plug?

A: Iridium plugs use an extremely hard, fine Iridium tip, allowing for a smaller center electrode. This requires less voltage to fire and maintains the gap much longer, providing superior longevity and a more stable, powerful spark over time. Standard copper or nickel plugs are cheaper but wear out faster and require more voltage to jump the gap as they age.