Triumph Norton Champion N9YC (NGK BP6ES Equivalent) Spark Plug(s) PN# TBS-N9YC

The Bonneville Shop lists the NGK BP6ES as the equivalent of the Champion N9YC spark plug. Before substituting plugs, confirm the application for your motorcycle’s model, year, and ignition system. Matching heat range alone does not establish complete compatibility; plug dimensions and firing-tip configuration also matter. See the Champion N9YC product listing for the listed replacement reference and specifications.

The Bonneville Shop’s product description lists the Champion N9YC for 1978–1982 Triumph T140E and T140D motorcycles. Confirm the specification in your motorcycle’s workshop manual before ordering, particularly if the engine or ignition system has been modified. For help checking your application, contact The Bonneville Shop with your model, year, and ignition details.

The product description specifically lists 1972–1975 Norton Commando 750 models, while the product’s fitment metadata also mentions Commando 850 models. Because these sections differ, confirm 850 compatibility before purchasing rather than assuming every Commando uses the same plug. Contact The Bonneville Shop with your motorcycle’s exact year, engine size, and ignition setup for application assistance.

The Champion N9YC listed by The Bonneville Shop has a 14 mm thread diameter, a 19 mm thread reach, and a projected firing tip. Thread reach describes how far the threaded section extends into the cylinder head. Check these specifications against your motorcycle’s required plug rather than choosing by thread diameter alone. Find the dimensions in the Champion N9YC product description.

A projected-tip spark plug has a firing-end configuration that extends farther into the combustion chamber than a non-projected design. The N9YC is listed as a projected-tip plug, and Champion identifies the letter “Y” with core-nose projection in its numbering guide. This configuration is one reason to verify the complete plug specification before making a substitution. Learn more in Champion’s spark plug decoding guide.

The Bonneville Shop describes the Champion N9YC as a relatively hot spark plug. “Hot” refers to how the plug retains and transfers heat—not how powerful its spark is. Champion explains that hotter plugs dissipate heat more slowly, while colder plugs transfer heat away more readily. Always use the heat range recommended for your engine; a plug that runs too hot can contribute to pre-ignition. See Champion’s guide to spark plug heat range.

Use the gap specified for your exact motorcycle and ignition system, rather than assuming one gap applies to every Champion N9YC installation. Champion recommends checking a new plug’s gap against the vehicle manufacturer’s specification, even when the plug comes pre-gapped. The Bonneville Shop’s N9YC listing does not provide a universal installation gap. Follow your workshop manual and any applicable ignition manufacturer instructions. See Champion’s spark plug gap guide.

Install spark plugs with the engine cool, clean the area around each plug before removal, and start each replacement plug by hand to avoid cross-threading. Check the gap first, then tighten to the specification in your motorcycle’s service manual. Do not substitute a generic torque value for the correct engine specification. Champion’s spark plug installation guide explains these basic precautions and warns against overtightening.

Yes. Heavy carbon or oil deposits can prevent a spark plug from providing a strong, reliable spark. The Bonneville Shop notes that plugs must be clean and free of these deposits to function properly. If your existing plugs are heavily fouled, check their condition before reusing them, and confirm that any replacements match your engine’s specified application. The Champion N9YC listing includes guidance on plug cleanliness and heat-range selection.

The Bonneville Shop offers the Champion N9YC as a single plug, a pair, or a pack of four. Select the quantity option you need before adding the item to your cart and check the displayed price for that selection. You can review the available options on the Champion N9YC spark plug product page.

The Champion N9YC product page states that The Bonneville Shop does not accept returns on electrical components. Confirm the correct fitment and quantity before ordering rather than relying on the store’s general return policy. Review the product-specific return notice and shipping and returns information, or contact the shop if you are uncertain about your application.

Start with the spark plug specification in your motorcycle’s workshop manual, then compare the replacement plug’s application, heat range, thread dimensions, and tip configuration. Include any ignition modifications when requesting help. You can contact The Bonneville Shop by phone at 720-570-7884 or email at orders@thebonnevilleshop.com. Providing the motorcycle year, model, and current plug number will give the team useful details to review.