Model # AC00164A

Internet # 203222932

Store SKU # 837113

4-Cycle Spark Plug

$4.97 /each

Frequently Bought Together

Product Overview

Keep your engine running smoothly with the Ryobi 4-Cycle Spark Plug for Trimmers. Great way to improve performance on used trimmers. Use the replacement spark plug with any of Ryobi 4-Cycle engines.

California residents: see  Proposition 65 information

  • For use with RYOBI string trimmers and blowers
  • Replacement part
  • Enhances engine performance
  • Improves starting
  • Replaces champion RY4C and torch CMR7A
  • 4-Cycle spark plug



Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 


Fits brands 
Ryobi 4 Cycle Trimmer 
Fits models 
RY34420, RY34421, RY09440, RY34440, RY34441, RY34000, RY34001, RY64400, RY64400A, RY64400B 
Part Type 
Spark Plug 
Used with equipment type 
String Trimmer 

Warranty / Certifications

Manufacturer Warranty 
90 Days 

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Customer Questions & Answers

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Customer Reviews

Rated 4.3 out of 5 by 3 reviewers.
Rated 5.0 out of 5.0 by No better choice anywhere - Home Depot! The Ryobi battery powered trimmer I just purchased is ideal. light weight, easily assembled and with plenty of power. October 20, 2015
Rated 5.0 out of 5.0 by 4-Cycle spark plug is just what I needed, auto parts stores nearby did not carry it. This spark plug is just what we needed. RYOBI is a great brand! Local auto parts stores did not carry this type or size of spark plug (small). The local Home Depot store did not carry it in stock either, which is strange since we purchased the weed trimmer at Home Depot. However, I was able to find it on your website. We received this spark plug in just two days and our trimmer is now back in business! Thank you. E. May 5, 2015
Rated 3.0 out of 5.0 by Mark I The spark plug was the right size and it made the engine run well! October 18, 2014
  • 2016-07-23 T14:55:54.874-05:00
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