Cross-Reference
Champion RCJ6Y Cross Reference: NGK BPMR7A Equivalent & Gap
Updated 2026-10-16
NGK's catalog cross-references Champion RCJ6Y to NGK BPMR7A (stock no. 4626). Compare thread, reach, and resistor specs, and see the gap for Stihl and Husqvarna equipment.
What is the NGK equivalent of Champion RCJ6Y?
NGK BPMR7A. NGK's own cross-reference catalog lists BPMR7A (stock number 4626) for Champion RCJ6Y. Both are 14 mm resistor plugs with a 3/8-inch (9.5 mm) reach. Neither has one universal gap: set it to your equipment's specification, for example 0.5 mm on the Stihl MS chainsaws and 0.7 mm on the Stihl FS trimmers in our records.
Read the manufacturer referencesDirect 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
Match the plug specified for your equipment before choosing a listing. Check the part number again on Amazon before ordering.
As an Amazon Associate, WhichPartFits earns from qualifying purchases.
RCJ6Y Gap by Machine
The gap belongs to the machine, not the plug. Our model records list 0.5 mm for the Stihl MS 170, MS 180, and MS 250 chainsaws and 0.7 mm for the Stihl FS 38 and FS 45 trimmers, all of which list RCJ6Y or BPMR7A.
Husqvarna records split the same way: 0.6 mm on the 128LD trimmer and 0.5 mm on the 130 and 135 chainsaws. Open your model page for its gap and source before setting the plug.
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.