The Autolite AR50 is a high-performance, non-resistor racing spark plug designed for consistent ignition and durability in small-displacement engines. With a hotter heat range than the AR51, it’s ideal for cooler-running 2-stroke engines or low-RPM conditions where fouling may be an issue.
Key Features:
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Non-resistor design: Delivers strong, interference-free spark—perfect for racing
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Thread size: 14mm
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Reach: 3/8" (9.5mm)
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Hex size: 5/8" (16mm)
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Heat range: Hotter than AR51 – minimizes plug fouling
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Solid copper core: Optimized heat transfer for racing reliability
Common Applications:
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Yamaha KT100
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HPV100 / KPV100
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IAME Mini Swift 60cc
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Other small-displacement 2-stroke kart engines
