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An AYK Bun Bun Racer I got from eBay a good while ago, have always thought these are are cool with the cartoon like proportions, the box art is fun too but sadly I didn't get the box with this one.
The name Bun Bun translates into Buzzing in Japanese, these cars have a centrifugal clutch so the motor always runs at low rpm without the model moving, the clutch has pins on it that work against a spring steel finger that makes the car sound like it has an F1 engine idling and revving up when driving. There are some videos on YouTube showing this. It's not a model built for speed with a little motor.
Did a cosmetic resto so far, couldn't get repros of the original play on words Caramel decals, so used a set of correct Camel ones, repainted the car from the inside as original paint was thin/patchy. As for the driver Senna would have been the obvious choice but given AYK are Japanese decided to paint him as Satoru Nakajima.
Next stage will be electrical/chassis restoration and get it buzzing again!