Why the change

Newfo

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In changing from stock exhaust cans to aftermarket, I noticed several things. Of course, when I closed the throttle and coasted in gear, the bike popped or back-fired regularly. I imagine that is because the cans leaned out the mixture. But, I also notice what I call more engine brake effect. With the aftermarket cans, I am being thrown forward (and I have to grip the tank) harder when I chop the throttle. Why? Does running lean increase the engine braking? If so, why?

omslaw

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You'll definitely want to remove the PAIR valve or do the Marble mod. That will get rid of your backfire/popping.

Charlesbusa

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Its backfiring because you haven't removed the PAIR valve.

The PAIR valve injects fresh air to the exhasut gases at the headers. This is for better emissions. Remove the PAIR and you won't have anymore backfiring.

About the engine braking, I don't know
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Revlis

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Maybe NOT the PAIR. Depends on what kind of "Backfire" he's talking about.

Damn, if he's talking about the little pop pops that's normal with aftermarket cans cause now you can hear it. It's the Big BAM!!! Type of Backfiring that you've got to worry about and Marble or remove the PAIR. Generally though with just Bolt on's no further effort is required.
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