Description
NGK stock number 1491 is the CR9EB BLYB standard nickel-electrode resistor spark plug supplied in individual blister packaging. Its 10 mm thread and 19 mm reach must match the engine's specified CR9EB plug; it is not interchangeable with plugs that use a larger thread or different reach.
Specifications
| NGK stock number | 1491 |
|---|---|
| Plug designation | CR9EB BLYB (blister-pack version) |
| Thread | M10 x 1.0; 19 mm (3/4 in) reach |
| Hex size | 16 mm (5/8 in) |
| Seat | Flat gasket seat |
| Factory gap specification | 0.8 mm (0.032 in) |
| Heat range / terminal | NGK 9; non-removable terminal |
| Electrodes | Nickel tips with copper core; resistor type |
Applications and compatibility
The CR9EB plug specification appears in NGK's application listings for selected Norton Commando 961 Sport and Cafe Racer motorcycles. Only choose stock number 1491 when the equipment calls for the same CR9EB plug and the blister-carded version is appropriate.
Package and installation notes
One spark plug is included per blister package. Check the exact equipment manual for plug gap and installation torque; fitment is determined by the engine, not the thread diameter alone.
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