In Japanese Speedway (autorace) no Godden / Weslake / Jawa / GM / Jap, but mostly Japanese engines.
Today only the Suzuki AR600 and AR500 twin Cylinders, but in the past HKS / Toyo / Meguro / Kyokuto / Triumph / BSA / Eicoh.
But further back also about more then 20 different machines from very small Honda's with 150cc, and very bigs ones like the Rikuo with 1216cc