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DRZ 3x3 Mod

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Just picked up a 2009 DRZ400S and have heard about a 3x3 Mod. Searched the forum and saw many references but no explanation. Can someone please tell me what this is or direct me the the discussion.

This one replaces a 1978 SP370 Thumper that was restored and then stolen by some a$$h@le. Looking forward to enjoying the updated ride.

Thanks.

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dont think that the 3x3 would help with out rejetting. buy a james dean jet kit with the extended feul mix screw.

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dont think that the 3x3 would help with out rejetting. buy a james dean jet kit with the extended feul mix screw.

That's right...the 3" square hole will provide too much air for a stock jetted carb...

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