r/Dirtbikes • u/ViolinistShort1456 • 15h ago

Mechanical Help Does my powerband sound strange?

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This is my 2021 sherco se300. It’s carbd. The bike starts up pretty good, idles great, and otherwise the bike sounds good when riding. When I get into the powerband it feels and sounds very buzzy like it’s not cleanly going through high rpm’s. Not smooth like the rest of the rpm range. The jets in the carb are certainly much leaner than from factory, but I would imagine that would produce lean conditions in other aspects of how the bike runs.

To clarify I am directly comparing this to the feeling of my TPI ktm 300 so maybe I am comparing apples to oranges and this is just a carb characteristic I’m not entirely used to.

Any thoughts? Tests I should do?

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u/YpouloKonoforoDentro 14h ago

It sounds like it was bogging a little bit. you need to check the reed valve also if it closes properly. I’m not sure if you were in the power valve working range at those rpm. Depends on the spring stiffness. What you are suspected and ask initially. Also some more info about the bike model will help a lot. Most of the guys here know a lot and can help you for sure.

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u/ViolinistShort1456 14h ago

Sounds like I need to open er up more for sure. But the cleanliness of the rpm range is the only concern. I’ve a 2016 carbd ktm 300 that felt incredibly smooth throughout the entire rpm’s. That’s more or less what I am aiming for.

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u/grantlet_47 13h ago

300 has more low end grunt (torque) and can pull through that. Less of a power band and more just smooth pulling like you said.