Autolite 4051 Copper Spark Plug – CR80/CR85, KX65, YZ85, RM85
Autolite Copper Spark Plug 4051 — 2-Stroke/Off-Road Applications
Reliable spark, solid value. The Autolite 4051 copper-core resistor plug delivers consistent ignition and durability across a wide range of mini and mid-displacement two-strokes.
What’s Included
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(1) Autolite 4051 spark plug (copper core, resistor type)
Key Features
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Copper-glass seal bonds insulator, terminal post, and center electrode for a gas-tight, 100% leak-proof seal
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Multi-rib insulator reduces flashover
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One-piece terminal post for added strength
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Resistor reduces RFI and electrode erosion
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Cold-formed steel shell with precision-rolled threads
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Full copper core electrode for reliable performance
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Note: Always verify cross-reference before purchase
Fitment (condensed)
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Honda: CR80/CR80RB (1986–2002), CR85R/CR85RB (2003–2007), MT125 Elsinore (1977–1978)
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Kawasaki: KX65 (2000–2016), KX80 incl. Big Wheel (1994–2000), KX125 (1983–1993)
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KTM: 125 MX/EXC/SX (1984–2010), 65 XC (2008–2009)
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Suzuki: RM65 (2003–2005), RM80 (1987–2001), RM85/RM85L (2002–2016), RM100 (2003)
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Yamaha: YZ80 (1986–2001), YZ85 (2002–2016), YZ125 (1979–1981, 1993), IT175 (1977–1978), TZ250 (1980–1981), TZ350 (1974)
(Covers all specific years listed in your compatibility data.)
Price & SKU
Retail Price: $5.95
SKU: 4-4051 / 4051
UPC: 009100254689
Estimated Shipping Weight: 0.15 lb
Package Dimensions: 3.30 × 0.90 × 0.90 in
Handling: Ships next business day.
📦 Shipping Information
In-Stock Items:
- Most parts ship next business day
- Modquad parts: Monday–Thursday dispatch
Made-to-Order Items:
- Custom swingarms & A-arms: 2–4 weeks
- EVP exhaust systems: 2–4 weeks
- Sneakers: 1–2 weeks
Stock Guarantee: Items marked "In Stock" ship immediately. Made-to-order items are built fresh for you.
Questions? Contact us—we respond within 24 hours.