The Honda 98066-55726 Spark Plug (X16FSR-U) is a genuine OEM ignition component designed for Honda BF100, BF75, BF15, BF9, and BF8 outboard motors. As a direct Honda OEM part, it carries the correct heat range, electrode gap, and thread specification to meet Honda's original design requirements for these outboard applications. Because Honda supersedes parts at serial breaks, confirm your motor's serial number against the fitment table before ordering to ensure this is the right plug for your unit.
Key Features
- Correct Heat Range for Marine Use — the X16FSR-U designation specifies the exact thermal rating Honda engineered for these outboard combustion chambers, ensuring the electrode runs hot enough to self-clean without pre-igniting under load
- Genuine OEM Part — sourced directly from Honda, this spark plug meets the same specifications as the plug installed at the factory, with no substitution in electrode material, gap, or thread dimensions
- Direct Replacement — plug installs in place of the original with no gap adjustment or thread chasing required; thread reach, seat style, and hex size match the original specification for BF100, BF75, BF15, BF9, and BF8 motors
- Serial Number Verification Recommended — Honda outboards share model designations across multiple production runs; check your motor's serial number against the compatibility table to confirm part number 98066-55726 is correct for your specific unit
A spark plug ignites the compressed air-fuel mixture inside the cylinder on each power stroke, and every firing decision — timing, combustion completeness, and throttle response — depends on the plug delivering a consistent spark. In an outboard motor operating under variable loads, throttle positions, and marine conditions, a worn or fouled plug leads to hard starting, rough idling, misfires at speed, and increased fuel consumption. Replacing a degraded plug with the correct Honda OEM unit restores clean ignition and keeps the outboard running smoothly across its full RPM range.
Part Details
| Part Number | 98066-55726 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Spark Plug (X16FSR-U) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Outboard Motor | BF75 | All |
| Portable Outboard Motor | BF8, BF9, BF15, BF100 | All |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
