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Since I first got involved with triples, right out of Vietnam in 1971, I have done extensive testing, development and design to these, and many other bikes.
That said, the hardest part in the beginning, was doing a correct primary section, port to first cone. Almost every manufacturer of aftermarket pipes, and factories, have made street bike exhausts with straight mandrel bent tubes.
To do it right, there is the hard part, those primary sections need to be tapered, a cone in themselves, which is extremely hard. We have all seen the tapered sections made from a lot of tapered small cones, welded to make a curved tapered section, two section stamping pieces welded together, and other nightmares for makers, primary sections. This is the best way to do it, but always has been tough to do, expensive, "not really needed for a street bike", the works in "I ain't gonna do that".
My first triple was a 1971 H1-A, and before I got heavy into modding it, and going to work for Team Kawasaki Road Race, U.S. A., my 1971 had "pipes" that actually had the factory connectors at the chamber inlets, and stock straight primary pipes, the chambers slid on, like the stock mufflers. Hi-R pipes just would not fit the stock frames.
So, find a nice set of tapered primary pipe chambers, great, only one thing left to figure out, ??? Is that taper the right configuration tuning wise, for that engine package ???
Nobody said all this was not a load of fun, look at all the intensive education your brain gets learning all of it. Keep telling yourself, it is all over the top fun, not frustration.
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