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Smog block off plates require tune?

This is a discussion on Smog block off plates require tune? within the YXZ Engine forums, part of the Yamaha YXZ Technical category; Looking to block off smog plates and remove spark arrestor on stock exhaust. Do I need a flash tune? Yxz is bone stock....

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Thread: Smog block off plates require tune?

  1. #1
    Senior Member jimeneztrans84's Avatar
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    Smog block off plates require tune?

    Looking to block off smog plates and remove spark arrestor on stock exhaust. Do I need a flash tune? Yxz is bone stock.
    Last edited by jimeneztrans84; 08-14-2017 at 07:22 PM.

  2. #2
    Senior Member Desertdog's Avatar
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    The block off plates are used to stop decel popping when you install an exhaust and tune.

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    Administrator 6gearz's Avatar
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    Just doing those two things you don't need to flash your ECU.

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    Senior Member jimeneztrans84's Avatar
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    Are smog block off plates recommended even if motor is stock? I believe the bad air goes back into the engine?

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    Administrator 6gearz's Avatar
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    Quote Originally Posted by jimeneztrans84 View Post
    Are smog block off plates recommended even if motor is stock? I believe the bad air goes back into the engine?
    You can leave them or remove them. They are just an emissions thing and have no performance gain either way.

  7. #6
    Senior Member jimeneztrans84's Avatar
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    No check engine light comes on after blocked off and don't plug the sensor?

  8. #7
    Administrator 6gearz's Avatar
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    Quote Originally Posted by jimeneztrans84 View Post
    No check engine light comes on after blocked off and don't plug the sensor?
    Correct.

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