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Throttle body mod.

This is a discussion on Throttle body mod. within the Grom Talk forums, part of the Honda Grom Forums category; Alright all, I am in the process of doing a port polish and performance upgrade on my grom (new head etc). I was going to ...

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  • 1 Post By nd4spdbh

Thread: Throttle body mod.

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    ND4's Throttle body mod.

    Alright all, I am in the process of doing a port polish and performance upgrade on my grom (new head etc). I was going to put this in my build thread but i felt it could be applied to anyone so I will separate it out.

    When I was taking things apart i noticed that the throttle body in the stock form had HUGE screw heads and excess screw holding the throttle plate onto the main shaft (relative to the small 24mm opening of the TB). Talk about some nasty airflow path.

    Throttle body mod.-img_20171111_134534972.jpg

    So, some stainless tapered head m3 screws (not pictured), a countersink bit, and some filing of the screws.....


    Throttle body mod.-img_20171112_135832228.jpg

    And you get this, A much better path for the airflow to go through the TB!

    Throttle body mod.-img_20171112_142528508.jpg

    Also while i was there i smoothed out the front edge of the TB itself.

    Throttle body mod.-img_20171112_155137696.jpg


    Just make sure to use some red loctite on the screws when you re-assemble


    (WATCH OUT!!!!, when you pull the throttle plate shaft out there are 3 lil seals. 2 on the Cam side that you dont really have to worry about, but the one on the TPS side has to pass through the main TB opening, and the way they are oriented its you have to be very careful when you pull it through the other side of the TB opening. If you do this pull it slowly out and you will see what i mean when you get "stuck" when the seal hits the inner part of the TB opening. You will have to use a little screw driver to push the outer lip of the seal down in the shaft hole so it slides out without destroying the seal)

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    Very nice. Those screws are quiet large for that little TB

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    I do this to stock Ruckus carbs and even go a little bit further in cutting off the the screw head side of the throttle shaft so that the screw goes through the throttle plate and the threaded part of the shaft. On the ruckus it makes a tremendous difference when dealing with such a small port

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    Fine tunning, good job

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    Quote Originally Posted by Strokd_GE View Post
    I do this to stock Ruckus carbs and even go a little bit further in cutting off the the screw head side of the throttle shaft so that the screw goes through the throttle plate and the threaded part of the shaft. On the ruckus it makes a tremendous difference when dealing with such a small port

    Ah i see what you are getting at. I could of done that but naw, counter sunk screw is good enough for me. I also rounded the leading edge of the throttle shaft so its not as sharp as well.

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    I just bought the Koso 34, flipped it, and called it a day.

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    Quote Originally Posted by S1K View Post
    I just bought the Koso 34, flipped it, and called it a day.
    Thats a fuck ton of gas money, the above cost 30 cents for 2 screws and a bit of my time.

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