Yamaha will be taking the wraps off its first 65cc race bike for decades at Saturday’s San Diego Supercross. The bike, which has been part of a teaser campaign over the past month, will be revealed by Yamaha’s new ambassador Ryan Villopoto in the paddock at the event in Southern California.

The picture above, leaked on the internet, is of an all-new YZ two-stroke which shows it has a steel frame with bolt-on subframe, box-section aluminium swingarm with built-in chain adjusters like the bigger YZs, a black fuel tank with blue radiator shrouds that cover the tank – unlike the current YZ85 – and KYB upside down forks. There are big wavy discs and Maxxis tyres on the blue rims. The bike also seems to have a power valve governor unit, the round piece between the clutch cover and exhaust. The current YX85 doesn’t have a powervalve motor.

Although many were quick to jump to the conclusion that this is the new YZ65, there is a large distance between the footpeg and the seat which means it could be an all-new small-wheel 85. So it’spossible Yamaha will be revealed an all-new 65 on Saturday, to be followed by a new-style YZ85 soon afterwards as a 2019 model. The YZ86 last had a major change in 2003.

The 65 means Yamaha will be back in the 65 class which is dominated by KTM, Husky and Kawasaki. Yamaha did use to make a YZ60 race bike but that was phased out decades ago.

Talking about the 65, Yamaha product line manager Derek Brooks said: “With the addition of this exciting new motorcycle, riders of nearly all ages will be able to join the bLU cRU, This all-new bike builds on Yamaha’s renowned history of performance and durability, helping young riders step onto the top of the podium and into the victorYZone”.