Cross-Reference
Champion RCJ6Y vs NGK BPMR7A: Differences & Fitment
Updated 2026-08-30
Compare Champion RCJ6Y and NGK BPMR7A spark plugs, including fitment evidence, important differences, and what to verify before choosing a replacement.
Direct Comparison
| Check | Champion RCJ6Y | NGK BPMR7A | What decides fitment |
|---|---|---|---|
| Cross-reference status | Listed in NGK cross-reference material for BPMR7A | Listed in NGK cross-reference material for RCJ6Y | A catalog cross-reference is a starting point, not model fitment proof. |
| Thread and reach | CJ shell: 14 mm x 1.25 mm thread, 0.375 in reach | 14 mm thread, 9.5 mm reach | The nominal shell dimensions align; still inspect the seat, terminal, and installed plug. |
| Resistor design | R prefix denotes a resistor plug | R in the NGK code denotes a resistor plug | Do not substitute a non-resistor plug when the equipment specifies a resistor type. |
| Gap | Set to the equipment manual specification | Catalog examples commonly show 0.7 mm, but application manuals can differ | The equipment manual and exact model variant control the installed gap. |
Compare the Parts
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Spark Plug
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Spark Plug
As an Amazon Associate, WhichPartFits may earn from qualifying purchases. Match the OEM number, dimensions, and model variant before buying.
Cross-Reference Is Not the Whole Fitment
RCJ6Y and BPMR7A are common cross-reference plugs in small 2-stroke equipment, but the model page still needs to match the actual equipment.
Confirm thread reach, terminal style, resistor type, heat range, and the required gap before ordering.
When the Old Plug Disagrees
If the plug in the machine does not match the model table, check whether the engine, cylinder, or ignition setup has been changed.
Do not copy a plug from a used machine without checking the model reference; previous owners often install close-looking substitutes.
Primary Sources
- NGK spark plug cross-reference catalogLists the RCJ6Y and BPMR7A cross-reference relationship.
- Champion spark plug code guideExplains resistor markings and CJ shell dimensions.
- NGK BPMR7A application specificationProvides BPMR7A thread diameter, reach, wrench size, and a catalog application gap.