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How to Pick the Best 4-Stroke Exhaust for Your Dirt Bike
https://www.motosport.com/blog/how-to-pick-the-best-4-stroke-exhaust-for-your-bike
EXHAUST TUNING ON A FOUR-STROKE ENGINE; …
https://www.sae.org/publications/technical-papers/content/2001-01-1797/
A Yamaha YZ400, 5-valve, 4-stroke cycle, motocross racing, motorcycle engine is instrumented to provide pressure diagrams in the exhaust system which are recorded over the usable engine speed range at full throttle from 5000 rpm to 11000 rpm. The engine produces a maximum of some 34 kW (46 hp) power output.
4-Stroke – FMF Racing
https://www.fmfracing.com/collections/4-stroke
The Factory 4.1 is FMF Racing's premier performance exhaust. With 30 years of racing experience behind it, the Factory 4.1 takes advantage of everything we've learned on the race track.-Available in natural or blue anodized finish.-Horsepower gains throughout RPM range.-Available with titanium or high strength stainless steel midpipe.
Basics of 4 stroke muffler design - RC Groups
https://www.rcgroups.com/forums/showthread.php?2697215-Basics-of-4-stroke-muffler-design
Scavenging a single cylinder is more challenging, so port shape, volume, exhaust valve size, valve lift, and exhaust system size/volume/length/etc. all have to be "just right" for best performance. Many RC 4-stroke engines aren't bothered as much by mufflers or not - usually the muffler only kills power by 200-400rpm unlike a 2-stroke as was mentioned previously.
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