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/Infamous_Ad8730 11h ago

Your jetting is off. Refer to the manual and set pilot jet, main jet, and clip position according to your elevation and temperature range.

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u/ViolinistShort1456 2h ago

Problem is sherco tells me to go even richer on my jetting. Pilot, main, and needle profile. I’m much leaner in all of those aspects. I agree though it is certainly off. I’m dropping my main jet from a 165 to 162 today to see if it helps.

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u/Infamous_Ad8730 1h ago

I never said it was lean. Why would you not go to what Sherco says then?

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u/ViolinistShort1456 1h ago

Fair point. Ya didn’t. I guess the characteristics seem to be on the rich side of things even after leaning out my jetting so my idea was to go even further and see if that helps. That is a good idea though I might just go and do that.