Dirty Chicken…

What do you get when you cross a two-stroke and a flat tracker? The Mach Chicken.


That’s what Aaron Pierson decided to do with his 1975 Kawasaki S1. Aaron, an aircraft mechanic who often works builds turboprops in Alberta, Canada, took this air-cooled triple to greater heights.


At the age of fourteen, he found the lump in a trailer at his family’s Kawasaki shop. It had been built as a hill climber with porting and S3 carbs. He kept the engine for years before deciding what to do with it. Then he bought an old, used chassis and got to work. Although the engine was still in good shape, he tore it down and shaved the heads, rebuilt and rejetted the carbs. In doing so, he increased the compression and tuned it for the power he wanted. The exhaust expansion chambers he made from scratch, after getting his hands on some rolled cones and a TIG welder, he taught himself how to weld on the build.


He then went to work on the frame, grinding away old tabs and adding new ones in his vision. He found a vintage Carlisle rear tire and a pristine Yamaha TY250 seat in his father-in-law’s barn and knew these would add to his project. He carefully modified the seat brackets to mount it. Both the stock S1 tank and TY250 seat have been painted in clean, classic Kawasaki racing colours.


Aaron built an aluminum inner fender to house the small gel battery, regulator, and a tool kit with spare parts is all hidden away. He made a new wiring harness, cleaner than ham the original, and added a new Yamaha WR450 push button start using a modern rectifier and regulator. Under the seat is a small gel battery and there’s a switch on the bars to flip between low, high and strobe for the LED headlight.


The running gear is simple, with no mirrors, turn signals or fenders, and an LED headlight. But he kept the original S1 speedo, just removing the bezel. Other parts on the bike are from all different models, 1970s Marzocchi shocks from a Hercules GS250, Kawasaki H1R choke lever, Works Connection clutch lever, Husqvarna foot pegs, and some aluminum bars he had lying around.


He then stripped the original wheels, painted and re-laced them and added a new Duro tyre up front. The drum brakes are refurbished and drilled, and the original forks rebuilt with new custom-made preload spacers. The end result is tyre-spinning, side-burning manic of a bike.


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