Original NGK IFR7F-4D (5115) Laser Iridium Spark Plugs for Yuchai/Wanyang Natural Gas Engines
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| Spark Plug Type | Laser Iridium Spark Plugs |
| Center Electrode Material | Iridium |
| Ground Electrode Material | Iridium |
| Thread Size | M14×1.25 |
| Thread Length | 19 millimeters |
| Hexagon Side | 16 mm |
| Resistance Value | 5 kOhms |
| Seal Type | washer seal |
| Electrode Count | 1 ground electrode |
| Ignition Clearance | 0.8 mm |
| Application Fuel | Natural Gas/Compressed Natural Gas/Liquefied Natural Gas/Biogas |
Manufacturer No.
NGK-5115IFR7F-4D5115
OEM Part No.
90919-01287M2A00-3705002AMY800-3705002
Engine Part No.
YC6MKYC6JYC6GWP10WP12
Interchange No.
1FR7F-4DIFR7U-4D
Fitment Vehicles
SINOTRUK HOWOHOWO A7Shaanxi Auto DelongF1 General TypeCoachNatural Gas Generator Set
Engine System - Industrial Encyclopedia
NGK IFR7F-4D (5115) Laser Iridium Spark Plugs, designed specifically for natural gas (CNG/LNG) engines. Featuring an iridium center electrode and ground electrode with 5 kohm resistance to interference, M14×1.25 thread, 19mm thread length, 16mm hexagon opposite edge. This spark plug is widely used in natural gas generator sets, coaches, and heavy truck engines of brands such as Yuchai, Weichai, and Xichai. OEM interchange numbers include 90919-01287, etc. The high durability design ensures stable ignition performance and long service life for heavy-duty gas engines.