NGK CR5HSA-CR8HSA Spark Plug

NGK CR5HSA, CR6HSA, CR7HSA & CR8HSA OEM Style Spark Plugs

NGK’s CR-series spark plugs are a trusted OEM replacement choice for powersports vehicles like the Polaris RZR 170 and Kawasaki Z-125 Pro, as well as many GY6 150cc motors. Designed to meet or exceed factory standards, these plugs deliver reliable performance, easy starting, and long-lasting durability.

Each spark plug features a laser-welded center electrode tip, engineered to provide consistent ignition and efficient combustion. Replacing worn plugs with fresh NGK units helps improve throttle response, acceleration, fuel economy, and emissions while ensuring dependable performance. Their superior anti-seizing and anti-corrosion properties also make installation and removal simple.

Heat Range Options

The correct spark plug heat range is critical when tuning or maintaining your engine. Choosing the wrong grade can cause overheating or fouling issues. Here’s a breakdown of the CR5HSA–CR8HSA options:

• CR5HSA (Hotter Plug) – Transfers less heat to the cylinder head, keeping the electrode hotter. Best for cold-weather starts or lightly tuned stock engines.

• CR6HSA (Standard OEM Choice) – Balanced heat range, ideal for most stock applications such as the Polaris RZR 170 and Kawasaki Z-125 Pro.

• CR7HSA (Colder Plug) – Transfers more heat to the cylinder head. Recommended for higher-compression engines, big bore kits, or performance upgrades where extra cooling is needed.

• CR8HSA (Even Colder Plug) – Best suited for heavily modified or race-built engines running at higher temperatures, preventing pre-ignition and piston seizure risks.

Specifications

• Thread Size: 10mm

• Reach: 1/2"

• Hex Size: 5/8"

Applications

• GY6 150cc Motors

• Kawasaki Z-125 Pro

• Polaris RZR 170