Kaptain Krunch
Pro Junk Collector
So if "no engine technically need back pressure" go and take the complete exhaust off a 2 stroke engine please. When you do that tell me how it runs.
2 stroke engines NEED back pressure to run properly.
done it to a couple engines, runs fine. You will have to re-jet.
Two strokes like the rebounding pressure waves created by expansion pipes, not back pressure. Any two stroke, or four stroke, will run fine with no back pressure if jetted properly. In fact, if you have a two stroke with a muffler (not an expansion chamber), straight piping it and re-jetting, will likely be an upgrade.