Update, my previous avatar and explanation was regarding a Jim Clark photo because Clark was best.
Current avatar is me on my Rickman 125 motocross bike. This was back in the mid to late 70s. Never raced, but Rickman motocross bikes were built to race. For those who aren’t familiar, Rickmans were built in Great Britain by the Rickman brothers. Their frames were stainless steel with incredibly fine welds. They used Sachs and Zundapp 2 cycle motors. Mine was equipped with a Zundapp 125cc. It was incredibly peaky with nearly all the power in the last 2,000 rpm. Note, keep the R’s up at all times, do not let it bog down. Low end torque was pretty much non existent. Fun, fun bike. Did a lot of dirt riding not too far from home. The only true racing machine I’ve ever owned. So, there it is.