I have had a few of customers in the shop the last week or so that said there was some discussion about some of the modifications that we perform on two-stroke exhaust systems. I read through the threads on two of TRX250r sites about stinger size and pipes. It is obvious there are questions that many of you have about two-stroke pipes. I have read a lot of threads over the years on public forums about discussions on two-stroke pipe theory and porting formulas. Some theory and formulas are valid or close enough to give us a good starting place on a new project, while the general public still associates a lot of myth and black magic with two-stroke engines.
I do not visit and share my experience with very many public forums because of the limitations of my time. We have a well-equipped shop where we do research and development and consulting for engine manufactures as well as individuals that can afford serious engine projects. Competitors criticize our efforts on new ideas and products saying that we test too much. I feel this is what gives us the understanding we have and the ability to constantly improve our products.
Many questions are very difficult for me to answer in laymen’s terms for those that do not have a solid foundation in the physics that govern our universe but I will try. I answer questions based upon being and engineer with over 40 years of experience building high performance two-strokes. Fortunately my answers do not usually agree with many shops or competitors in a similar business to mine. I would be a dull world if everyone drove Chevys, or everyone was on the same team, or every one had equal abilities. Without opposition there could not be competition. Every race would end in a tie! Competition is what has always driven me to try to be one of the best in my field.
I am open to questions and will try to respond when time permits.
Jerry Hall
