The Spondon XR45 of Theo Louwes. In the last racing days of the Suzuki RG500 different manufacturers made deltabox frames. I made a photo set, Bakker, Spondon, VRP, GPA, Harris and Golinelli, I also included the modified street frames. 
Rob Bron on the Bakker HRD GTR750 at Daytona in 1975.
Beautiful YZR500 replica seen at the CRT two stroke track day, Assen 7 Oktober 2023.
Kevin Schwantz his Lucky Strike RGV500 seen at the Classic GP at the TT circuit Assen September 2023. 
The Dick de Jager 500cc four cylinder boxer two stroke is a very rare beast. As far as I know there exists only one engine. The König crankcases are known for weak casting and prone to crack. So de Jager decided to make a beter crankcase, the barrels are from Yamaha and the crank is a modified König one. The engine delivers 111 hp. Owner Luc de Smet from Belgium still races it at classic meetings with his female teammate Zoë Beun.
This home build race car with a tuned Suzuki GT750 engine used to race against the Ocelot racers in the D-sports race series in the USA. 
GT750 special seen at the 2023 meeting in Hardenberg of the Suzuki GT club of the Netherlands.
