NGK 90908 Spark Plug

Laser Iridium Spark Plug Overview

The NGK Laser Iridium Spark Plug 90908 is an OE-style ignition component built for precise combustion and dependable starting. It is engineered for applications that call for the GR8DI-12 service number and is listed for select Husqvarna and KTM models.

This spark plug uses an iridium center electrode, a copper core, and a ceramic insulator to support stable ignition performance. The 5000-ohm resistor design, 1.2 mm pre-gap, and flat seat construction make it a fitment-specific replacement for modern small-displacement engines.

Key Features

• Laser Iridium design for OE application coverage
• Iridium center electrode for long service life
• Copper core and ceramic insulator for heat control
• 5000-ohm resistor type for ignition system compatibility
• Flat seat, M14 x 1.25 thread, and 19.0 mm reach
• GR8DI-12 service number and NGK 90908 part number

Detailed Description

NGK developed the Laser Iridium line for OE applications that require consistent spark quality and durable electrode construction. The fine-wire iridium center electrode, nickel ground electrode, and standard J-gap configuration help maintain reliable ignition under demanding operating conditions. This NGK 90908 spark plug is also identified by service number GR8DI-12 and cross-references Dorman - Conduct-Tite 90908 for the same application.

Compatible With select Husqvarna TE150i and KTM 150 EXC, 150 XC-W, and 150 XC-W TPI applications, this spark plug is a direct replacement choice for owners servicing the ignition system on these models. The NGK Laser Iridium Spark Plug 90908 is built around OE specifications to match the required heat range, reach, and terminal style.

What It Is Used For

• Restoring weak or inconsistent spark output
• Addressing hard starting caused by worn electrodes
• Replacing fouled plugs that affect idle quality
• Correcting misfire symptoms tied to plug wear
• Maintaining proper ignition performance in OE applications

Installation Notes and Tips

Verify the service number GR8DI-12 and confirm thread size, reach, seat type, and pre-gap before installation. Use the specified torque procedure for the engine application and inspect the ignition coil, boot, and plug well for contamination or damage during service. The washer is included, and the plug uses a non-removable nut terminal.

Quality Assurance

NGK tests Laser Iridium spark plugs to OE-level standards for quality and durability. The iridium tip, copper core, and ceramic construction are selected to support long-term ignition performance in approved applications.