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carb balancing ?

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ravingriley
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Joined: 20 Oct 2008
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PostPosted: 00:57 - 13 Dec 2008    Post subject: carb balancing ? Reply with quote
okay i have just come across people talking about carb balancing
what actually is this
is it when you have twin carbs and need to . . well, balance them out so the same amount of fule is going to each cylinder ?
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temeluchus
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Joined: 01 Oct 2008
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PostPosted: 03:05 - 13 Dec 2008    Post subject: Reply with quote
pretty much.

You need to keep multi carbs adjusted to supply equal amounts of mixture when you open the throttle.

Bit of a faff on a 4.
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Charlie
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PostPosted: 11:00 - 13 Dec 2008    Post subject: Reply with quote
I thought it was to make sure that they supplied the fuel/air mixture at the same time?
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Rowey
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PostPosted: 11:08 - 13 Dec 2008    Post subject: Reply with quote
No it's so one cylinder doesn't run rich/leaner than the other. Obviously you don't need to do this on singles. Usually the use of a vacuum gauge will show whether the carbs out unbalanced.
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Ichy
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PostPosted: 12:42 - 13 Dec 2008    Post subject: Reply with quote
Rowey wrote:
No it's so one cylinder doesn't run rich/leaner than the other


Not true. Jets control the mixture ratio. Some bikes actually have different jets in the inner carbs to run richer on different cylinders and control the temperature.

Balancing keeps each carburetor working the same amount to deliver equal amounts of petrol and air to each cylinder. You measure how hard each cylinder is working by checking the vacuum at each of the carburetors. The vacuum is generated by the downward motion of the cylinders on the first of the 4 strokes.

There is a pressure drop when you open the throttle. What balancing does is to make sure that each throttle valve on each carb is allowing the same pressure drop to occur, therefore sucking the same amount of petrol up through the jets.

You can balance the carbs fairly accurately without the bike running, in fact you can have a good go at it when they are off the bike.
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Last edited by Ichy on 16:16 - 13 Dec 2008; edited 2 times in total
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yen_powell
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Joined: 22 Jun 2008
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PostPosted: 12:53 - 13 Dec 2008    Post subject: Reply with quote
You've got to add little lead weights to the lighter carbs so your bike tips into corners just as well on left and right hander corners.
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ZaphodBeeble
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Joined: 10 Feb 2004
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PostPosted: 09:36 - 15 Dec 2008    Post subject: Reply with quote
Balancing your carbs/throttle bodies is one of the easiest and cheapest ways to make your bike run better. It doesn't necessarily affect the performance but it makes the bike a lot smoother. V-twins are the worst for it in my opinion and triples are second worst. Inline 4 Bandit 600's vibrate like buggery at certain points in the rev range and carb balancing can sort that out.

Basically when a set of carbs are out of balance the different cylinders are getting differing amounts of throttle which makes them 'fight against each other' so to speak. This is what causes the roughness of an unbalanced engine.

If you have the time and equipment I highly recommend balancing your carbs/throttle bodies.
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