Welcome to martinjohnson2stroke.com

I am a UK based motorcycle engineer, specialising in 2 stroke tuning and hydroformed exhaust pipes.

You’ll find me toiling away in my small workshop, deep in rural Devon. Almost all of my customers find me through “word of mouth”; I don’t advertise at all! I will tune pretty much anything 2 stroke, and when it comes to pipes, for the most part I build expansion chambers for Yamaha bikes – mainly 250 LCs, TZ and TZRs, and TDRs.

I use advanced engine modelling software to formulate my designs, as well as years of tried and tested expertise. Two stroke bikes have been a passion for me from an early age.

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