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Vacuum Slide Drilling
Old 08-16-2010, 05:16 AM   #1
mcvierh
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Vacuum Slide Drilling

How to Drill the Vacuum Port in the Carb Slide
Why? For faster throttle response. By opening up the vacuum port, the slide can move faster.
1. Pull the top off one off one of the carbs, and then remove the spring.
Pay attention to how the rubber diaphram is in place. You will have to put it back into the small groove when you are finished. This is a pain the butt and could take some time. One side took me about 15 minutes to get the diaphram back into the groove, and the other side popped in with about 2 minutes of effort.

2. Pull the slide out. It lifts out quite easily. Dump out the needle and white plastic piece into your hand and set it aside.

3. Look at the bottom of the slide. The small hole is the vacuum port. Drill it out to 7/64" bit. I would recommend getting a brand new drill bit for this. You want it to be a nice clean hole. Remove any barbs and smooth out the hole after you drill with a drill bit one size bigger.

4. Make sure you clean off every single fragment of metal from the drilling! Then put it all back together. Try not to pull your hair out when you are putting be diaphram back in. Just be patient. The diaphram is just a tiny bit larger than the groove it needs to go back into on the top of the carb, and will require some finesse. After the diaphram is in place, put the needle, plastic piece, and spring back in. Carefully put the top back on, and don't disturb the diaphram that you just spent so much time on.
That's it! Do the other side and you are done.
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Old 08-16-2010, 04:06 PM   #2
CheeseMan316
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McV. What year are you working with on this one. Because my 07 DC was different. Just want to get the info on the first page as to what year(s) this applies to.
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Old 08-16-2010, 04:14 PM   #3
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actually thats an '05 CV 40mm.....but all CV carbs are the same when it comes to drilling the vacuum slide, don't drill the hole in the center thats where the needle goes, drill the hole beside it.
Drill the vacuum holes in the slide. Flip the diaphragm up (or down depending how you are looking at the slide) so that you can set the slide on the table.

these are from the VT750DC book, your and everyone elses vacuum slides will look the same as those below.
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Last edited by mcvierh : 08-16-2010 at 05:36 PM.
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Old 09-14-2010, 08:17 AM   #4
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I found that using a hair dryer on the rubber diaphragms makes them a bit more pliable and relaxes them, remembering heat expands, cold contracts....really helps to fit them into the groove before you put the cover on.

just use common sense with the hair dryer...if it is too hot on your hand, it is too hot for the diaphragm. Just warm them up a bit, that's all.
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Old 12-13-2010, 05:44 PM   #5
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Old 12-13-2010, 05:50 PM   #6
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Quote:
Originally Posted by 750hdgmd
I found that using a hair dryer on the rubber diaphragms makes them a bit more pliable and relaxes them, remembering heat expands, cold contracts....really helps to fit them into the groove before you put the cover on.

just use common sense with the hair dryer...if it is too hot on your hand, it is too hot for the diaphragm. Just warm them up a bit, that's all.
Good hint.
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Old 03-02-2011, 07:38 PM   #7
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awesome.. may do this when i re jet this spring... would this effect/change the jets you would normally need having not done this?
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Old 03-02-2011, 08:09 PM   #8
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No., doesn't have anything to do with jetting, just makes for a much faster throttle response, and will also brighten your smile.......
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Old 03-02-2011, 08:18 PM   #9
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Awesome... thanks
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Old 03-03-2011, 10:02 AM   #10
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Does it work on the c2 with single carb?
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