10 Pack CMR7H Spark Plugs, Spark Plug for Shindaiwa 3699-91867 Red Max 369991867, 506615101, 544260901, Sparkplug for Husqvarna 581362301 Stihl Redmax Blowers Brushcutters Trimmers Chain Saws

What It Is

This is a 10-pack of CMR7H spark plugs, a standard replacement part for 2-stroke handheld outdoor power equipment like trimmers, blowers, brushcutters, and chain saws from brands including Shindaiwa, Red Max, Husqvarna, Stihl, and Echo.

Fitment & Compatibility

Before buying, confirm your machine uses the CMR7H plug (thread size 14mm, reach 9.5mm, hex 16mm, with a threaded terminal). This plug cross-references OEM numbers: Shindaiwa/Red Max 3699-91867, Husqvarna 581362301, Stihl 0000-400-0040, and Echo 506615101. It fits most 2-stroke handheld units from these brands (e.g., Husqvarna 122C, 128CD, 324L; Stihl FS 55, FS 90; Red Max EBZ7500, BC225). Not for 4-stroke engines or large deck mowers. Check your owner’s manual or pull the old plug to verify the exact model and thread length—using a plug too long can damage the piston.

Key Things to Know

• Quality level: These are standard copper-core plugs—adequate for normal use but not as durable as iridium or platinum options. Expect 25–50 hours of run time before replacement.
• Installation: Simple—gap is pre-set, but verify it’s 0.024–0.028 inches with a feeler gauge. Hand-tighten then 1/4 turn with a socket; overtightening can crack the insulator.
• Common gotcha: The 10-pack is a good value for a fleet, but if you only need one plug, a single at a parts store may cost less upfront. Also, some Stihl/Husqvarna units use a different plug (e.g., BPMR7A)—double-check the old plug’s code.
• Storage: These are shelf-stable, but keep them dry. A dropped plug with a cracked ceramic is dead—inspect before installing.

Should You Buy It

Buy this pack if you maintain multiple 2-stroke trimmers, blowers, or saws from Husqvarna, Stihl, Shindaiwa, or Red Max and want a budget-friendly stock of standard plugs for regular swaps. Skip it if you need a longer-life plug for heavy commercial use or have a 4-stroke mower—look for an iridium plug instead.