Carb balancing on the cheap (pictures!)

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Skier
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Re: How do the carbs become out-of-balance?

Unread post by Skier » Tue Sep 12, 2006 7:44 pm

koconno2 wrote:I hope someone is still answering this string. This seems like great information for old bike owners like my self. I have a 81 Honda CX650 with two carbs. I have very little experience with motorcycles and since I have the engine removed from the bike for an alternator R&R I thought I should tune the carbs after the reassembly.

What causes the carbs to become out-of-balance to start with? Are there worn out parts that should be replaced first?
Screws can be vibrated out of their positions, for one thing. Metal can warp, as well.
koconno2 wrote:Are both ends of the manometer attached to the carbs?
Yes. Each carb gets one end attached to it. This way you can tell which carb's throttle is open more than the other.
koconno2 wrote:Do you attach the manometer to manifold vacuum or venturi vacuum?
Each carb, or carb intake, should have a nipple or port to hook the gauge in to. Manifold vacuum only measures the total vacuum, it doesn't compare one carb to the other.
koconno2 wrote:Could I use vacuum gages instead of a manometer?
Yes you can, if and only if you have shown they are calibrated perfectly. Absolutely laboratory perfect. Otherwise it's going to be worthelss. Dropping the $5 on some ATF and tubing is a much better, more accurate solution. :)
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Unread post by koconno2 » Wed Sep 13, 2006 8:54 pm

Great, thanx for the info.
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Unread post by slimcolo » Fri Jun 08, 2007 7:19 am

Great idea my Syncro is too bulky to carry and mercury almost impossible to find. Wish I had CV or slider carbs on my 91 They never stay in sync.

also matey;

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Unread post by feliz » Sat Aug 25, 2007 8:21 pm

I've used this method and ATF for years with great success and actually prefer it over the "proper' gauges which I have.

On some bikes, like my CB750 I remove the tank altogether and place it on a step ladder near the bike and just run hoses to the carbs. Some bikes, like my 05 Ural nothing has to be removed, just put the petcock on prime, plug the tubes into the vacuukm ports and she's good to go. Some bikes you can remove the tank and there's (barely) enough fuel in the system to sync the carbs without doing anything.
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Unread post by sherry1234 » Fri Oct 02, 2009 5:14 am

Did the manometer described above but used 10-w30 oil , it was a little slow to move but it did the job anyway.
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Unread post by Johnj » Fri Oct 02, 2009 9:25 am

If you look here you'll see another type of manometer made out of two baby bottles.
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Re: Carb balancing on the cheap (pictures!)

Unread post by PeterTrocewicz » Mon Apr 19, 2010 4:26 am

This is awesome. I have a proper set of the cheap (no restrictors)carb balancers from Motion Pro, but they used mercury. The problem has been that each time I snap the throttles, th e bike sucks a bit of mercury in. Now there isn't enough left in there to do a proper job . I was wondering what to do, now I know. I'll just reomove the rest of the Mercury and fill it with ATF. Thanks!
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Re: Carb balancing on the cheap (pictures!)

Unread post by Johnj » Mon Apr 19, 2010 9:56 am

Peter, you'll need much longer tubes, almost twice as long.
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