NGK 3066 CMR7H Resistor Spark Plug – Replacement Lawn & Garden Equipment Engine Ignition Component

Part Number: 3066
Category: Lawn & Garden Equipment Replacement Parts
Type: Replacement CMR7H Resistor Spark Plug

The NGK 3066 CMR7H Resistor Spark Plug is a replacement engine ignition component designed for compatible gasoline-powered lawn and garden equipment. Featuring the CMR7H spark plug designation, this component delivers the electrical spark required to ignite the air-fuel mixture inside the engine's combustion chamber, helping support dependable starting, consistent combustion, and smooth engine operation.

Product Specifications

• Part Number: 3066

• Brand: NGK

• Spark Plug Model: CMR7H

• Product Type: Resistor Spark Plug

• Component Type: Engine Ignition Spark Plug

• Thread Diameter: 10 mm

• Thread Reach: 12.7 mm (1/2")

• Hex Size: 16 mm (5/8")

• Heat Range: NGK 7

• Resistor Configuration: Yes

• Electrode Configuration: Standard Ground Electrode

• Application: Small Gasoline Engine Ignition Systems

• Function: Air-Fuel Mixture Ignition

• System: Engine Ignition and Combustion Assembly

• Equipment Compatibility: Select Lawn & Garden Equipment Engines Specifying NGK CMR7H

• Condition: New

Features & Benefits

• NGK 3066 CMR7H replacement spark plug

• Features the specified CMR7H resistor spark plug configuration

• Designed for compatible gasoline-powered small engines

• Integrated resistor helps suppress ignition-related electrical interference

• Provides the electrical spark required for engine combustion

• Features a compact 10 mm threaded configuration

• Features a 12.7 mm thread reach

• Uses the NGK 7 heat range designation

• Compact design suitable for designated small engine applications

• Helps support dependable engine starting when properly installed

• Supports consistent combustion and smooth engine operation

• Provides a replacement for worn, fouled, or damaged spark plugs

• Helps restore ignition performance when spark plug deterioration is the cause of operating problems

• Designed for use with appropriately matched engine ignition systems

• Suitable for routine engine maintenance and tune-up procedures

• Practical replacement component for residential and professional outdoor power equipment servicing

Applications

• Compatible gasoline-powered lawn and garden equipment

• Small engine spark plug replacement

• String trimmer ignition system maintenance where compatible

• Leaf blower engine servicing where compatible

• Hedge trimmer engine maintenance where compatible

• Brush cutter ignition system servicing where compatible

• Chainsaw engine maintenance where compatible

• Outdoor power equipment engine tune-ups

• Replacement of worn or fouled spark plugs

• Engine starting system troubleshooting

• Routine gasoline engine maintenance

• Residential lawn equipment servicing

• Professional landscaping equipment maintenance

• Preventive engine ignition system inspection

• Equipment specifying NGK CMR7H spark plugs

Important Notes

• Verify NGK part number 3066 before ordering

• Confirm the CMR7H spark plug designation against your engine manufacturer's specifications

• This listing is for a replacement resistor spark plug, not a complete ignition system

• Confirm compatibility with your specific equipment and engine model

• Do not assume compatibility with all string trimmers, chainsaws, leaf blowers, or other outdoor power equipment

• Verify the engine manufacturer's recommended spark plug type before purchasing

• Confirm the required 10 mm thread diameter and 12.7 mm thread reach

• Verify the correct hex size, heat range, and electrode configuration

• The NGK 7 heat range must match the engine manufacturer's requirements

• Do not substitute a spark plug with an incorrect heat range

• Confirm the correct electrode gap using the engine manufacturer's specifications

• Do not assume the factory electrode gap is correct for every compatible engine

• Verify whether the engine requires a resistor-type spark plug

• Similar-looking spark plugs may differ in thread diameter, thread reach, heat range, or resistance characteristics

• Do not assume interchangeability with other NGK spark plug models based on appearance alone

• Confirm compatibility with the existing ignition coil, spark plug boot, and ignition system

• Do not assume installation tools or additional ignition components are included

• Follow the equipment and engine manufacturers' installation instructions

• Shut off the engine and allow it to cool completely before replacing the spark plug

• Disconnect the spark plug wire or ignition boot before beginning maintenance

• Keep dirt and debris away from the spark plug opening during removal and installation

• Inspect the original spark plug for carbon buildup, oil deposits, electrode wear, or physical damage

• Check the replacement spark plug for damage before installation

• Verify the electrode gap using an appropriate spark plug gap gauge

• Adjust the gap only when permitted by the manufacturer and without damaging the electrodes

• Start threading the spark plug by hand to help prevent cross-threading

• Tighten the spark plug according to the engine manufacturer's specified torque requirements

• Avoid overtightening, which may damage the cylinder head threads or spark plug

• Ensure the spark plug boot is securely connected after installation

• Never touch the spark plug or ignition components while the engine is running

• Spark plug replacement may not resolve problems caused by fuel delivery, carburetion, compression, or other ignition system faults

• Inspect and replace spark plugs according to the manufacturer's recommended maintenance schedule

• Test engine starting and operation according to manufacturer instructions after installation

• Confirm current specifications, engine compatibility, and included quantity before ordering