Spark Plugs & Ignition Service Parts
Spark plugs for motorcycles and small engines, quoted on thread, reach, heat range, gap and seat type. Plugs that look alike are frequently not interchangeable: heat range and reach change how the plug sits in the chamber, and that is an engine specification rather than a tuning choice.
Also searched as: motorcycle spark plug, small engine spark plug, iridium moto plug, spark plug cross reference
Send a drawing, a sample or an OE number and we quote this part type to it. The selection data below is what the quote is built from.
What decides the price
In order of impactDiameter, pitch and reach locate the plug in the chamber. Reach that is too long puts the plug into the piston's path.
The range sets how fast the plug sheds heat. Too hot and it pre-ignites; too cold and it fouls.
Gasket seat or tapered seat, resistor or non-resistor. Seat type decides whether you need a washer at all.
Worth checking before you order
Numbering systems differ between makers. Two plugs with similar numbers can sit in different heat ranges.
Gap is specified. A plug gapped by eye runs, and then misfires under load.
Selection data
Confirmed per orderQuoted to your specification
Send a drawing or a samplePart numbers for this subcategory are quoted to order. Send the size, grade and finish you need, or a drawing, and we quote against that.
Questions
Can I swap brands by number?+
Only against a published cross-reference table, and even then the heat range has to match. Send the engine code and we check.
Are the plugs gapped?+
We state the gap. Whether it needs adjusting depends on the application, and we say that rather than shipping a number.
Send the specification, not the product name.
Grade, size, thread standard and coating are what a quote is built from. A product name alone produces a price that changes twice before the order.