BDFHYK 1134 Spark Plugs Review (Set of 6): BR8HS-10 Replacement for Yamaha, Tohatsu & Mariner 2‑Stroke Outboards — Compatibility, Gap, and Install Tips

Looking to freshen up a two-stroke outboard that’s hard-starting, idling rough, or fouling plugs after long trolling runs? The BDFHYK 1134 Universal Spark Plugs are marketed as direct replacements for BR8HS-10 and are compatible with Yamaha, Tohatsu, and Mariner 2‑stroke outboard engines. This 6‑pack aims to deliver reliable ignition performance, OE‑level durability, and good value—especially if you maintain multi‑cylinder setups or want spares on board.

• Cross-reference: 1134 / BR8HS-10 (check your service manual to confirm)
• Engine type: 2‑stroke outboard (Yamaha, Tohatsu, Mariner)
• Quantity: 6 plugs per set
• Manufacturer: BDFHYK (TS16949-certified production; 12‑month support)

See pricing, availability, and the compatibility chart: View the BDFHYK 1134 spark plug 6‑pack on Amazon.

What stands out about the BDFHYK 1134 set

• Designed as BR8HS-10 replacements: If your owner’s manual calls for BR8HS-10, these are intended to be a drop-in fit. The “-10” typically denotes a 1.0 mm (0.039–0.040 in) gap specification—verify and set the gap before installation.
• 2‑stroke focused: Two-stroke outboards can foul plugs more readily due to oil in the mix; fresh, correctly-gapped plugs help cold starts, idle stability, and throttle response.
• Manufacturer claims on build: BDFHYK states fine electrodes and high-density ceramic insulators, targeting fast, consistent ignition and solid insulation under marine conditions.
• OE-level durability: Produced by a TS16949-certified manufacturer and backed by a 12‑month service commitment, plus 24‑hour response for support.

Check full details and current deals: See the BDFHYK BR8HS‑10 replacement plugs on Amazon.

Compatibility notes (read this before you buy)

• Intended applications: Yamaha 2‑stroke outboards, Tohatsu 2‑stroke outboards, and Mariner 2‑stroke outboards that specify BR8HS-10 (or 1134) plugs.
• Cross‑reference: “1134” is commonly associated with the BR8HS-10 spec. Heat range “8” (NGK scale) is typical for many 2‑stroke marine applications.
• Always confirm: Match the plug to your exact engine model, year, and the OE spec in your service manual. Some engines call for different heat ranges (e.g., BR7HS-10 or BR9HS-10), so double‑check before installing.
• Terminal style: Verify your ignition lead/boot style (some setups require a threaded stud vs. a fixed terminal nut).

You can quickly verify current compatibility on the listing: Check compatibility and price on Amazon.

On‑water performance: what to expect

• Easier starts: Fresh plugs with the correct heat range and gap improve cold starts, especially after storage or in cooler weather.
• Smoother idle: Consistent spark helps reduce stumble at idle and during low‑speed trolling—prime fouling territory for 2‑strokes.
• Cleaner acceleration: A strong ignition kernel can sharpen throttle response and reduce misfire under load.
• Reliability: Marine use is tough on plugs—humidity, salt, vibration. Quality insulators and consistent electrode geometry matter for longevity.

Installation tips and best practices

• Gap first: “-10” indicates a 1.0 mm (~0.040 in) target gap for many applications, but shipping can alter gaps. Set with a feeler gauge to your manual’s spec.
• Torque correctly: For 14 mm gasketed plugs in aluminum heads, a typical spec is 25–30 N·m (18–22 lb‑ft). If your manual lists a different value, follow that. Do not overtighten.
• Anti‑seize caution: Most plug makers advise against anti‑seize on modern nickel‑plated threads. If you do use it, reduce torque by ~20% to avoid over‑tightening.
• Dielectric grease: A small dab inside the boot helps seal out moisture and eases future removal.
• Replace as a set: Swap all plugs together to keep cylinder performance uniform.
• Service interval: Many boaters replace 2‑stroke plugs annually or ~100 hours, but always follow your manufacturer’s interval and fuel/oil recommendations.

Need a quick reference or want to save this for your next tune-up? Grab the BDFHYK 1134 6‑pack on Amazon.

Quality and materials

• Electrode and insulator: The brand notes fine electrodes and isostatic ceramic insulators for high density and strength—key for combustion stability and electrical insulation.
• Resistance: The “BR” prefix indicates resistor plugs, which help reduce RFI/EMI interference (useful for protecting marine electronics).
• Manufacturing: Produced by a TS16949-certified facility; BDFHYK offers 12‑month quality service with 24‑hour support response.

Who it’s for

• Owners of Yamaha, Tohatsu, or Mariner 2‑stroke outboards that call for BR8HS‑10
• DIYers performing seasonal tune‑ups or de‑winterizing
• Boaters who want a value‑oriented 6‑pack to cover multi‑cylinder engines plus spares

Who should look elsewhere

• Engines requiring a different heat range or plug type (consult your manual)
• Four‑stroke outboards (often use very different plugs)
• If you strictly want OEM-branded plugs, consider genuine NGK equivalents, but expect to pay more

Pros

• Intended one‑for‑one replacement for BR8HS‑10 (1134)
• Set of 6 is cost‑effective for multi‑cylinder engines and keeping spares aboard
• Resistor design helps minimize electronic interference
• Manufacturer-backed quality control and support

Cons

• Compatibility mistakes are common—always confirm your exact model and heat range
• As with any non‑OEM brand, long‑term life vs. premium OEM plugs may vary
• Pre‑gapped claims can be unreliable after shipping; manual gap check is a must

FAQs

• Are these pre‑gapped to 1.0 mm? They’re intended for the “-10” gap spec, but always verify with a feeler gauge before installing.
• Will these fit my Yamaha 40/50/70 hp 2‑stroke? Many of those use BR8HS‑10, but Yamaha used multiple heat ranges across years. Confirm via your owner’s manual or the engine’s plug chart.
• How tight should I make them? If your manual doesn’t specify, a common range for 14 mm plugs in aluminum heads is 25–30 N·m (18–22 lb‑ft). Tighten to spec with a torque wrench.
• Do I need to change the plug caps/wires? Not unless they’re worn or corroded. Inspect boots and leads for cracks, corrosion, or loose terminals.

Value and verdict
For two‑stroke outboard owners who need BR8HS‑10 equivalents, the BDFHYK 1134 set offers a practical, budget‑friendly path to refresh ignition and keep spares on hand. Provided you confirm compatibility and set the proper gap, these plugs can help restore easy starts, cleaner idle, and consistent performance.

Ready to tune up your outboard?

• Check price and compatibility on Amazon
• Buy the BDFHYK 1134 (BR8HS‑10) 6‑pack
• See current reviews and delivery options

Amazon Affiliate Disclosure: As an Amazon Associate, I earn from qualifying purchases. This comes at no extra cost to you. Product details and prices can change—always check the listing for the most current information. Always follow your engine manufacturer’s specifications and safety procedures when servicing ignition components.