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An Inexpensive DIY Carb. Sync. Tool

Old 08-31-2007, 08:22 AM
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An Inexpensive DIY Carb. Sync. Tool

I was wandering through the Internet today and can across a very interesting article on how to make a $2.00 carb sync tool! All the carb sync tools that I saw on line were $90-110 and I thought to myself there has to be a way to engineer one. So I came across this link a thread that I was reading and thought I would pass this along.

I have not tried it yet, but I spent $70 at my local Honda dealership to have this done, so I am game to try.

Good luck and post your successes or failures with this item.
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Old 09-01-2007, 07:54 AM
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I use a Carbtune II. It comes with restrictors that go inline with the vacuum tubing. These restrictors have a very small I.D., maybe .010. They keep the readings from jumping all over the place. Without something like that, that DIY kit may not be of much use.
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Old 09-13-2007, 10:31 AM
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I use my Mitey Vac brake bleeder and pinch the line to calm the needle down.
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Old 09-21-2007, 03:00 PM
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where does that hook onto?
and any ideal what the superhawk should run at?
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Old 09-21-2007, 05:40 PM
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From what I understand the home made jobs are much more sensitive (accurate) than the mercury ones sold.
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Old 09-22-2007, 07:55 AM
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I can say this set up works well. Atf,Mavel Mystery Oil or 2 stroke oil work well -- no harm no fowl if it gets sucked into engine. For an I-4 make up 2 and put lines side by side. Make sure all hoses are attached before starting or fluid will get sucked out. I like MMO because it is of it's lite weight(more sensitive). Best of all it's cheap. Home Depot or Lowes for tubing by the foot and tubing fittings.
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Old 09-22-2007, 10:15 AM
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I made mine with some wide mouth glass bottles, rubber stoppers, clear plasitc tubing and ATF. One inch of mercury = 13.6 inces of water at vacuum. I'd guess ATF at 15-17 inches.

I'm able to dial those columns within a half inch of each other. That is about 1/30th the spec Honda calls for. The difference between merely "in spec" and 1/30th spec is something I can feel before I get out of the driveway.

Adjusting two columns of mercury to within 1/30th of an inch of each other is way tougher than ATF to within a half an inch.
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