Autolite A4316 HD4 Spark Plug fits Sportster 1952-78 Models & Jawa Models Oem 32301-47A 31629-78 Sold Each

Autolite Standard, .30 Gap, Sold EA

 Fits K Model & Sportster 1952/1978 Replaces HD Code 4 Replaces HD# 31629-78 Aluminum oxide insulator for high thermal conductivity, high dielectric strength, and precise heat range control Tapered chrome-nickel alloy tip creates a greater spark, precise heat range control, and better acceleration Terminal post bonded to a center electrode for gas tightness and full voltage Copper core center electrode for better fouling resistance Available in Iridium plugs which are the ultimate in spark plug technology Iridium is six times harder than platinum and is heat resistant to temperatures up to 4000° F The Iridium electrode is 25% smaller than a platinum electrode and is 75% smaller than a conventional nickel electrode The micro-electrode reduces voltage requirements and extends ignition life

Does list more models this plug fits (call with the models and we will check)

Jawa Models, Harley 900cc Models.

The link below to Autolite Plug listing: copy and Google

https://www.autolite.com/docs/default-source/tech-specs/technical-bulletins-and-installation-instructions---french/autolite_rv5_0221_fis.pdf?sfvrsn=dfc3fd0d_2

(M18086)