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Hi i have an kx250 2stroke can i modify the stock silencer to get more performance?

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No. All you'll achieve is noise. If you want more/better power an expansion chamber is the ticket. As well as a good silencer.

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Hi i have an kx250 2stroke can i modify the stock silencer to get more performance?

No...

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you could shorten it, but I leave that to pro circuits R304. they size down the core to make it quieter and they give it a round can for better packing abilities. the silencer only slightly changes the powerband in one area. The pipe is where most advances in power are made.

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Agreed with all. So bottom line is the pipe is the key, a fresh packed silencer is whats best. these engines actually need some back pressure. If they flow too much, it will hurt performance.

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