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  1. #1
    dockwalker's Avatar
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    Drilled return depth

    Posted this in How to Section first and no response. How deep should drilled return hole be? Should you be able to see bit in return nipple? Don't want to destroy my carbs. Oside Bill rebuilt my carbs on my XLT and I never looked to see how he did it..

  2. #2

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    I haven't done it yet. But I think the wall thickness is pretty thin from what I've read. Interested in the answer myself. I'm doing it this weekend.

  3. #3
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    Yes, the return restriction is thin. When you start drilling you'll feel the bit 'pop' through into the return opening.

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  5. #4
    dockwalker's Avatar
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    Quote Originally Posted by Myself View Post
    Yes, the return restriction is thin. When you start drilling you'll feel the bit 'pop' through into the return opening.
    But can you see bit from the side nipple?

  6. #5
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    Yes. The return path makes a 90* straight out the nipple.

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    We just did this to our GPR carbs. Drill slowly and don’t push down, let the bit do all the work. I was a little nervous as well, but once we did one the others were a breeze.

  8. #7
    dockwalker's Avatar
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    Quote Originally Posted by Myself View Post
    Yes. The return path makes a 90* straight out the nipple.
    Thanks, thought so. Looks like it matches up.Now another question, why not bigger than an 1/8th....3/16...1/4?.Got inline restriction. Maybe WFO will chime in?

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    1/8" is the internal diameter of all the barbs, so all matches.

  10. #9

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    I did mine today. Measured depths in pics. Wall thickness total ~ .15" . Depth to inner wall ~ .3".

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