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A constant RPM two-stroke engine with a tuned pipe will still produce unburned hydrocarbons (HC) in its exhaust, but the tuned pipe can help optimize the combustion process to reduce overall emissions compared to a standard exhaust. The tuned pipe improves scavenging, which can reduce the amount of fuel and oil that escapes unburned, but it also means that the exhaust will be richer in HC when the engine is operating at its tuned RPM.
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