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

• (1) Autolite 4051 spark plug (copper core, resistor type)

Key Features

• Copper-glass seal bonds insulator, terminal post, and center electrode for a gas-tight, 100% leak-proof seal

• Multi-rib insulator reduces flashover

• One-piece terminal post for added strength

• Resistor reduces RFI and electrode erosion

• Cold-formed steel shell with precision-rolled threads

• Full copper core electrode for reliable performance

• Note: Always verify cross-reference before purchase

Fitment (condensed)

• Honda: CR80/CR80RB (1986–2002), CR85R/CR85RB (2003–2007), MT125 Elsinore (1977–1978)

• Kawasaki: KX65 (2000–2016), KX80 incl. Big Wheel (1994–2000), KX125 (1983–1993)

• KTM: 125 MX/EXC/SX (1984–2010), 65 XC (2008–2009)

• Suzuki: RM65 (2003–2005), RM80 (1987–2001), RM85/RM85L (2002–2016), RM100 (2003)

• 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.