NGK CMR5H Standard Spark Plug – 10mm Resistor Plug for Honda GX35, Shindaiwa & Stihl OPE – NGK 7599

Ensure reliable starts in your small engine with the NGK CMR5H spark plug – the OE-specified replacement for Honda GX25/GX35, Shindaiwa trimmers/blowers, and Stihl outdoor power equipment . Features a 98% pure copper core for superior heat dissipation, 10K Ohm resistor for EMI suppression, and 10mm micro-thread design for compact engine applications .

Verified Honda owner: "My weed eater wouldn't start – swapped to CMR5H and now runs like new." 

Vehicle Fitment:

Always verify fitment using your equipment's model and engine code before ordering.

Product Specifications:

⚠️ Important – CMR5H vs CM5H:

NGK confirms CMR5H is the direct replacement for CM5H. The "R" indicates a resistor, which suppresses interference. Verified user: "CM5H is no longer available – dealer said CMR5H is the correct replacement. Works perfectly." 

Why Choose NGK CMR5H?

• 10mm micro-thread – Precision fit for compact 4-stroke handheld engines 

• 10K Ohm resistor – Suppresses EMI for reliable ignition module operation 

• 98% pure copper core – Rapid heat dissipation prevents overheating in air-cooled engines 

• Nickel-alloy electrodes – Extended service life in high-vibration OPE applications 

• Integrated terminal – One-piece design for positive plug cap retention 

• Cold-rolled threads – Prevents cylinder head damage in soft aluminium castings 

• Trivalent plating – Corrosion resistant; no anti-seize required 

Oregon cross-reference: 77-200, replaces 31915-Z0H-0030 

Torque: 12–12.7 ft-lb (17.2 Nm) – 14mm hex adaptor required for 10mm plug.

Trust the original. Trust NGK.