From my research it seems that the stock PZ30 when tuned properly is adequate for these 250's when basic bolt-on mods have been performed like air filter, exhaust, cdi, timing key, etc. When you did into the engine internals such as port/polish, cam, increasing bore, etc then its time to move up to a carb like a PE30/PWK30.
But i'd love to hear opinions on this.. on my Brozz, i didnt jump to the PE30 until i had the port/polish work done.. prior to that i was running a tuned PZ30 with exhaust and air pod
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2024 Templar 250
2021 Beta 500 RRS
2018 VStrom 1000 XT
Former China Bikes: Tao DBX1, Brozz 250, CSC RX4, Titan DLX, Templar X, Storm DLX 150
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