Not radared speed, but just going off my Trail Tech Vapor... I was able to get 154km/h (95.7mph) indicated in 1/4mile on a gravel road by our farm. 15-49 gearing. The motor has windowed piston, vforce3 reeds and fmf gnarly pipe. I was running on VP U4.4 fuel. I realize the speedo is not going to be accurate like a radar, but it's a ballpark.