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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 5th May 2006
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Mattbastard Mattbastard is offline
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Default I drilled it out to 1/8" Am I boned?

Over the Easter break I installed a S&S air cleaner with a K&N filter, as well as put on a higher flowing exhaust. While I was in the carb I drilled out the slide bypass hole to 1/8" because that's that nightrider.com suggested. Before I did this I also summoned the genius on XLForum.net. According to Turboda, on 11/27/04, "This hole needs to be drilled out just slightly to 1/8". Then after that, other forum members state that 1/8" is too big, and 7/64" is a better diameter.

I could fill it up with JB Weld and redrill, but when I took it out for a little rip it ran fine and didn't flutter or bog or anything. Of course, it was in the 50's, so the air was more dense, which may have masked a rich condition.

So, did I fug it up?

Edit: 96 883 with 12K mi. Pretty much all stock
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Old 5th May 2006
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Matt, the slide hole is really only about throttle response and how fast your slide opens. If it rides fine for your style then don't sweat it. Plugging and redrilling just adds something that can come loose and end up in a cylinder.
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Old 5th May 2006
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I've drilled it out on two bikes too, I don't think it's a problem.
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Old 5th May 2006
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i agree i didnt drill mine but i say if it runs great go with it
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Old 5th May 2006
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BONED?

Only if you don't like the throttle response...

Only issue is that you can't get smaller...

I always tell people to stay out of the top of your carb because most folks simply DON'T NEED TO mess with it....

If the throttle response is too quick for you now (and you have a stock spring), all you can do is change the whole diaphragm assembly....not that expensive...if you have the Dynojet spring, go back to stock....

When drilling, always remember less is better..
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Old 8th May 2006
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Watch hard acceleration.....

Under hard accell it may become too lean with the slide drilled too big...

Each bike and rider are different ....

and while I don't recomend drilling it that large in most cases

you can get away with it sometimes....



I've had more troubles with slides that are drilled too big than slides that havn't been drilled enough ..... it's very common on Jap multis to drill too big and it ends up with a huge flat spot in the acceleration ... I have lost count of how many I have had to "repair" by closing the hole up and redrilling...

It's often exacerbated by an air cleaner venturi that smooths the flow out and directs more unturbulant air in
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