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3x3 mod issue

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I have a drz400sm with FCR 39 Mx carb, installed 48 pilot/ 160 main, full yosh exhaust & 3x3 mod. Runs better with clean towel in 3x3 hole. Can I tape hole up? 

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Rather sounds like you need to enrich the jetting.

Tapping it up would be a 'band-aid' fix and likely choke up the full potential of your Yosh exhaust.

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Live in Midwest, throttle response, decel popping, re do jetting?

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2 minutes ago, mlatour said:

Rather sounds like you need to enrich the jetting.

Tapping it up would be a 'band-aid' fix and likely choke up the full potential of your Yosh exhaust.

Enrich jetting? Total throttle response, decel popping.

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This will likely get moved to the appropriate sub-forum where you'll get more experienced members with these mods.

but throttle response is likely more accelerator pump related and,

popping on decel can be either jetting, a characteristic of that pipe or, a bad header-to-head seal which allows for an air leak.

Edited by mlatour

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Depending on what state ya live in, would like to know what's a good jetting for Milwaukee WI. Back to drawing board.

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Definitely a jetting issue.  The easiest way to deal with that is to install a JD Jet kit.  They give you everything you need and the instructions are very easy to follow.  Or just tape over the 3x3 hole and live with a lesser performing bike.

- you call.

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