vac readings of carbs. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 6 (permalink) Old 07-25-2008, 08:07 PM Thread Starter
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vac readings of carbs.

Has anyone taken a vacume reading on the carbs? I have taken the readings on the front and the back and then both at the sametime. The readings are all the same, I get a fast fluctuation on the guage from 0 to 10 on the meter. I have not tried the Manometer, no need at this time. The bike is running just fine. I was looking into it for future maintanance, when the time comes to sync the carbs. It just seems like the fluid would be easily sucked up in to the carb with the fluctuation going on. I have read where other people have tried the manometers or a version of and the fluid was sucked up into the carbs. Any thoughts about this.

2004 25,500 miles
Led tail light enhancement
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R+R relocation
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Fused Stator
Mcct conversion-cost 4.50
Ride-on in tires
crash bar with home made hyway pegs
iridium plugs
home made fork wind deflectors
coil pickups adjusted.
Kenda kruz tires 110/90 170/80

Last edited by weh44att; 07-25-2008 at 10:18 PM.
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post #2 of 6 (permalink) Old 07-26-2008, 12:54 AM
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I just sync'd my carbs. I tried to get a vacuum reading before hand, and the needle jumped around too much to even attempt to read it. Once I put on the manometer (homemade with 15w-40 engine oil for fluid), although it 'percolated' about an inch, give or take, the fluid did not even come close to getting sucked up into the carbs. I had close to 2 1/2 ft of hose on each side above the fluid, so even if the carbs were terribly out of sync, I would have had plenty of time to kill the engine before the oil reached the point at which it would have been sucked in.

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1989 VN750-A5
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post #3 of 6 (permalink) Old 07-26-2008, 02:29 AM
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I did the home built manometer deal. Filled the loop in the plastic hose, I don't know, half the way up on the board with Red ATF, drew a line. Then I started the engine. Adjusted the sync. screw until it was back to the that line at 4500 rpm. done deal. That's it, easy as pie, it runs as smooth as ****.

Glenn

1985 VN700
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post #4 of 6 (permalink) Old 07-26-2008, 11:44 AM Thread Starter
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Thanks for the info, was not sure if the guage was reading right after hooking it up. Thought I might of had a hose loose or something. So what it is doing is just normal. Well now when I want to sync I will not have to worry about the fluid going into the carbs.

2004 25,500 miles
Led tail light enhancement
Homemade floor boards
Headlight modulator
Extra heat sink on R+R
R+R relocation
Homemade driver's backrest
Fused Stator
Mcct conversion-cost 4.50
Ride-on in tires
crash bar with home made hyway pegs
iridium plugs
home made fork wind deflectors
coil pickups adjusted.
Kenda kruz tires 110/90 170/80
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post #5 of 6 (permalink) Old 07-26-2008, 11:55 AM
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There is a way to make a fluidless comparative manometer.
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post #6 of 6 (permalink) Old 07-26-2008, 01:17 PM
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If you are having trouble with fluctuation in the gauges/jars/manometers you use.

Try buying a set of aquarium airline valves and place them inline between the carbs and the gauges. Start the bike with the valves open and close them slowly till you get the stability you need.

Or you can be even cheaper like me and pinch off the lines with needle nose visegrips

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balanced
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looking for smoothbore sidedraft carbs
possibly fat bob tanks
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