Tag Archives: 2 stroke exhaust

The Highwayman F37 a custom, purpose-built vintage road racer, Part I


This story highlights the creation of a road race engine from the fusion of two different enduro motors, as well as the design and fabrication of a custom racing chassis to house the “franken-motor.”

Stainless Denco replicas for the Kawasaki H1

featured H1 denco

I needed chambers for a Kawasaki triple that I was restoring and decided to make my own after being disappointed with what was available for these bikes. The goal was to make exact copies of vintage Denco chambers to ensure good performance and stick with the period look.

Complex stainless GP style pipes with 54 cones total!

featured RZ  pipes

This was a project for a friend who needed a custom set of expansion chambers for his Yamaha RZ350. This special RZ350 had been modified with an Aprilia RS250 swingarm. He liked the way Spec II RZ pipes performed  so we used them as a model, but also made some innovations. I call this design “RZ350 Spec III.”

Also included in this post are some pipes for a RZ350 motor in an RS250 chassis…

Broad band power for the Kawasaki A7 350 rotary valve twin

featured A7 pipes

The Kawasaki A7 Avenger 350 cc rotary valve 2-stroke twin is a fun little bike.

I was surprised to find how quick these things are, and do hear they were very progressive for their time!

Expansion chambers for an airplane!?

Cricri featured

When I got a call to make a set of expansion chambers for “The world’s smallest manned twin engine airplane” I just could not resist!

The Colomban Cri-cri (or Cricket) was designed in the early 1970’s by Michel Colomban. Since then many renditions have been built. Most Cri-cri aircraft are powered by two single-cylinder 2-stroke engines making 9-15 HP each. However this Cri-cri is special in that it has two twin-cylinder 2-strokes as the power plants!