We researched and compared seven spark plugs commonly used in Predator 212 engines. Our evaluation is based on manufacturer specifications, published industry standards, and aggregated owner feedback. We looked at heat range, electrode material, gap consistency, and real-world performance reports to help you choose the best plug for your application.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
NGK BPR6ES Top Pick Heat range 6, 14mm thread, 0.708" reach, resistor type |
9.4 | 🛒 Check Price |
 |
Champion RC12YC Best Value Heat range 12, 14mm thread, 0.708" reach, copper core |
8.7 | 🛒 Check Price |
 |
Autolite AR3910X High Performance Iridium tip, 14mm thread, 0.708" reach, non-resistor |
8.4 | 🛒 Check Price |
 |
NGK BPR7ES Colder Heat Range Heat range 7, 14mm thread, 0.708" reach, resistor |
8.1 | 🛒 Check Price |
|
🚗
|
E3.36 Unique Electrode 14mm thread, 0.708" reach, DiamondFIRE electrode |
7.8 | 🛒 Check Price |
|
🚗
|
Denso IW20 Iridium Long Life Iridium tip, 14mm thread, 0.708" reach, resistor |
7.3 | 🛒 Check Price |
 |
Motorcraft SP-479 Budget Pick Platinum tip, 14mm thread, 0.708" reach, resistor |
7.1 | 🛒 Check Price |
1. NGK BPR6ES: Top Pick
The NGK BPR6ES is the most commonly recommended spark plug for the Predator 212, and for good reason. In our research, we found that it meets the exact specifications called for by the engine manufacturer. Owner feedback consistently reports easy starting, stable idle, and trouble-free operation in both stock and mildly modified engines. The resistor construction helps prevent radio frequency interference, which is important if you use electronic accessories.
However, if you are building a high-performance racing engine with a billet flywheel and high compression, you may need a colder heat range like a BPR7ES. The BPR6ES is best for stock or mildly upgraded engines. Skip this if you need a non-resistor plug for maximum spark energy in a race-only application.
- Proven OEM replacement for many small engines, including Predator 212.
- Resistor construction reduces electromagnetic interference.
- Consistent gap out of the box; minimal adjustment needed.
Pros: Widely available and affordable.; Reliable starting and smooth idle.
Cons: Not a performance plug; limited gains over stock.
2. Champion RC12YC: Best Value
We compared the Champion RC12YC against the NGK BPR6ES and found it performs similarly in stock Predator 212 applications. Owner feedback indicates it is a direct replacement that provides consistent ignition. The copper core dissipates heat well, which can help prevent pre-ignition. For the price, it offers reliable performance for daily use or backup engines.
The main limitation is electrode life; copper plugs require more frequent replacement compared to precious metal plugs. If you want a set-and-forget solution for a high-hour engine, consider an iridium plug. We recommend the RC12YC for budget-conscious builders or as a spare.
- Copper core electrode for good heat transfer and long life.
- Popular alternative to NGK; often found at local auto parts stores.
- Gap set at 0.030" out of box; check before installation.
Pros: Very affordable; excellent value for the price.; Reliable performance in stock engines.
Cons: Copper electrode wears faster than iridium or platinum.
3. Autolite AR3910X: High Performance
For Predator 212 engines with performance modifications such as a high-compression head, camshaft, or carburetor upgrade, the Autolite AR3910X iridium plug is a strong choice. In our evaluation of owner feedback, many racers reported improved throttle response and reduced misfires at high RPM. The fine-wire iridium electrode requires less voltage to fire, which can help with ignition systems that have limited output.
However, because it is a non-resistor plug, you may experience electrical noise that affects tachometers or other electronics. This plug is overkill for a stock engine; you will not notice a difference. We recommend it only for modified engines where every bit of performance matters.
- Iridium fine-wire center electrode for improved ignitability.
- Non-resistor design delivers maximum spark energy.
- Suitable for modified engines with higher compression.
Pros: Better throttle response and combustion efficiency.; Longer service life than copper plugs.
Cons: Non-resistor may cause radio interference.; Higher cost; not needed for stock engines.
4. NGK BPR7ES: Colder Heat Range
The NGK BPR7ES is a colder heat range plug designed to handle higher combustion chamber temperatures. In our research, we found that builders with billet flywheels, high-compression pistons, or nitrous use this plug to avoid pre-ignition. Owner reports indicate it works well in race-only engines that spend time at high load.
The downside is that in a stock or mildly modified engine that sees a lot of idling or low-speed operation, the BPR7ES can foul quickly due to insufficient heat to burn off deposits. Skip this plug unless you have significant internal modifications and run the engine hard.
- One step colder than BPR6ES; helps prevent pre-ignition in high-compression engines.
- Resistor type to suppress interference.
- Commonly used in racing applications with methanol or high boost.
Pros: Reduces risk of detonation in modified engines.; Same fitment as BPR6ES; direct swap.
Cons: May foul easily in stock engines run at low RPM.; Not needed for mild builds.
5. E3.36: Unique Electrode
The E3.36 spark plug features a unique diamond-shaped ground electrode that E3 claims improves flame kernel growth. In our comparison of available data, we found mixed owner feedback for small engines. Some users reported smoother idle and better fuel economy, while others saw no difference. The plug is physically compatible with the Predator 212.
We are cautious about recommending it because the claimed benefits are not consistently verified in owner reports for this specific engine. If you are curious about the technology, it may be worth trying, but for most builders, a standard plug will perform just as well. Skip if you prefer proven designs with extensive community testing.
- Patented DiamondFIRE electrode design claims more complete combustion.
- Direct replacement for RC12YC and BPR6ES.
- Gap pre-set; no adjustment needed.
Pros: Unique design may reduce misfires.; Easy installation.
Cons: Limited owner feedback for Predator 212 specifically.; Higher cost than standard plugs.
6. Denso IW20: Iridium Long Life
The Denso IW20 is an iridium plug designed for long life. In our evaluation, we found that its heat range and dimensions match the stock Predator 212 requirements. Owner feedback is limited for this specific engine, but Denso’s reputation for quality is strong. The iridium tip can last tens of thousands of miles in automotive applications, but in a small engine that may be overkill.
The main drawback is the price; you pay a premium for longevity that you may not fully utilize if you change plugs seasonally. Also, some users reported that the gap was not consistent out of the box. We recommend this only if you want a premium plug and plan to keep it in the engine for a long time.
- Iridium center electrode for extended service intervals.
- Resistor type for reduced interference.
- Heat range equivalent to NGK 6.
Pros: Very long electrode life.; Good for engines that see many hours.
Cons: More expensive than copper plugs.; Overkill for most Predator 212 applications.
7. Motorcraft SP-479: Budget Pick
The Motorcraft SP-479 is a platinum-tipped plug that is sometimes used as a cross-reference for small engines. In our research, we found that its dimensions are close to the required 0.708″ reach, but some owners reported that the thread length was slightly different, causing installation issues. The platinum tip offers improved wear resistance over copper, but the plug is not a common recommendation in Predator 212 forums.
We include it as a budget option, but we advise caution. If you choose this plug, double-check the reach and gap before installation. For most builders, a standard NGK or Champion is a safer bet. Skip this if you want a guaranteed fit.
- Platinum center electrode for longer life than copper.
- Resistor type; meets OEM specifications for many small engines.
- Often found at a low price point.
Pros: Inexpensive for a platinum plug.; Decent durability for the price.
Cons: Not specifically designed for Predator 212; fitment may be tight.; Owner feedback mixed; some report misfires.
Frequently Asked Questions
What is the correct spark plug gap for a Predator 212?
The recommended gap for a stock Predator 212 engine is 0.030 inches (0.76 mm). Always verify the gap with a feeler gauge before installation, as some plugs may be pre-gapped incorrectly. For modified engines, follow the camshaft or ignition manufacturer’s recommendation.
Can I use an iridium spark plug in a Predator 212?
Yes, you can use iridium plugs like the Autolite AR3910X or Denso IW20. They offer longer life and better ignitability, but are not necessary for stock engines. For high-performance builds, iridium can help prevent misfires at high RPM.
What heat range spark plug should I use for a modified Predator 212?
For mild modifications, the stock heat range (NGK BPR6ES) is fine. For high-compression or nitrous applications, a colder plug like NGK BPR7ES helps prevent pre-ignition. Avoid going too cold, as it can cause fouling in street use.
How often should I replace the spark plug on a Predator 212?
In normal use, replace the spark plug every 100 hours of operation or once a season. If you notice hard starting, misfires, or poor performance, check the plug sooner. Copper plugs wear faster than iridium or platinum.
Will a non-resistor spark plug damage my Predator 212?
Non-resistor plugs will not damage the engine, but they can cause electromagnetic interference that may affect electronic tachometers or kill switches. For most applications, a resistor plug is recommended to avoid issues.
Our Verdict
After researching and comparing, our top pick is the NGK BPR6ES for its proven compatibility, reliable performance, and value. For those on a tight budget, the Champion RC12YC is an excellent alternative. If you have a heavily modified engine, consider the Autolite AR3910X iridium plug for its improved ignitability.
