Carb balancing question and does anybody stock K&N filters?

[nzspokes]

Ive made a carb balancer with 4 hoses connected to each other with oil in them. When I connect it to the carbs the balancer bubbles and air rates. Is the oil to light? I have been running it lower than the carbs, should it be above the carbs?

Also who if anybody stocks K&N air filters for motorbikes?

[cs363]

Also who if anybody stocks K&N air filters for motorbikes?

http://www.whites.co.nz/products/kandn/986.aspx

[nzspokes]

http://www.whites.co.nz/products/kandn/986.aspx

Cheers.

They dont seem to stock one for my bike. :(

[Madness]

:facepalm:

[cs363]

Cheers.

They dont seem to stock one for my bike. :(

Their loss then, take your pick: http://www.ebay.com/sch/i.html?_sacat=See-All-Categories&_from=R40&_nkw=KA0850&LH_PrefLoc=2&rt=nc :)

(I'm assuming this is for your GPZ: http://www.knfilters.com/search/product.aspx?Prod=KA-0850)

[nzspokes]

Their loss then, take your pick: http://www.ebay.com/sch/i.html?_sacat=See-All-Categories&_from=R40&_nkw=KA0850&LH_PrefLoc=2&rt=nc :)

(I'm assuming this is for your GPZ: http://www.knfilters.com/search/product.aspx?Prod=KA-0850)

Yeah, I was just on there. Cheers for the link.

[NinjaNanna]

Ive made a carb balancer with 4 hoses connected to each other with oil in them. When I connect it to the carbs the balancer bubbles and air rates. Is the oil to light? I have been running it lower than the carbs, should it be above the carbs?

Also who if anybody stocks K&N air filters for motorbikes?

Show us the design

[nzspokes]

Show us the design

Its a KA-0850.

[NinjaNanna]

Its a KA-0850.

i meant of your balancer setup

[nzspokes]

Ooops. Here it is.

Have been wondering if air is getting in the fittings. May try 2 loops instead.

Pulled a plug today showing her being rich. Removed the snorkel from the air box to lean it a bit. She seems to have found some torque.

[pete376403]

It looks like the four tubes are joined at the bottom. Can't see how it would work assuming the top of each tube is connected to a vacuum port in the inlet manifolds (ie one tube per manifold port). Manometers that I have used have been a U tube, open at one end and the vacuum is applied to the other end, and the fluid rises up the vacuum side of the U proportional to the degree of vacuum. A carb balancer for a multi cylinder engine would be 4 U tubes

[nzspokes]

It looks like the four tubes are joined at the bottom. Can't see how it would work assuming the top of each tube is connected to a vacuum port in the inlet manifolds (ie one tube per manifold port). Manometers that I have used have been a U tube, open at one end and the vacuum is applied to the other end, and the fluid rises up the vacuum side of the U proportional to the degree of vacuum. A carb balancer for a multi cylinder engine would be 4 U tubes

Im not saying I havnt screwed it up. :baby:

[Sable]

Get some vacuum gauges gimplord

[NinjaNanna]

As I understand it they shouldn't be joined at the bottom.

I'm not sure if it changes based on bike, but as I understand it balance is adjusted in banks. Carb 1&2 are balanced against each other, 3&4 are balanced against each other then 1/2 & 3/4 is balanced against each other.

All that is needed is 2 long tubes, one linking 1&2 and the other linking 3&4.

http://www.motorcyclistonline.com/howto/motorcycle_carb_sync/index.html

[nzspokes]

As I understand it they shouldn't be joined at the bottom.

I'm not sure if it changes based on bike, but as I understand it balance is adjusted in banks. Carb 1&2 are balanced against each other, 3&4 are balanced against each other then 1/2 & 3/4 is balanced against each other.

All that is needed is 2 long tubes, one linking 1&2 and the other linking 3&4.

http://www.motorcyclistonline.com/howto/motorcycle_carb_sync/index.html

I had read that the way ive done it works as well. But in practice it doesnt. Will try the 2 tube way next.

Cheers

[Madness]

http://faq.ninja250.org/wiki/How_do_I_synchronize_the_carburetors%3F

[Laava]

It looks like the four tubes are joined at the bottom. Can't see how it would work assuming the top of each tube is connected to a vacuum port in the inlet manifolds (ie one tube per manifold port). Manometers that I have used have been a U tube, open at one end and the vacuum is applied to the other end, and the fluid rises up the vacuum side of the U proportional to the degree of vacuum.

The manometer is designed to test the individuals vacuum compared to another. If one end is open to aptmosphere, it will simply suck thru into engine.
nzspokes, simple is best. You should us one tube with a large loop of approx 1m height and any oil is OK. I use atf in mine. It is fail safe. If you have probs then you have other issues. Motor must be warm and you leave the tube attached to the vacuum on the one carburettor that is non adjustable. ie, one of them [no 3?] will be fixed in order for the others to be adjusted to it. Make the idle high and be patient.

[pete376403]

Obviously physics has changed a lot since I went to school but refer to "liquid column guage" on this page http://en.wikipedia.org/wiki/Pressure_measurement.

Quote -"Liquid column gauges consist of a vertical column of liquid in a tube that has ends which are exposed to different pressures. The column will rise or fall until its weight is in equilibrium with the pressure differential between the two ends of the tube. A very simple version is a U-shaped tube half-full of liquid, one side of which is connected to the region of interest while the reference pressure (which might be the atmospheric pressure or a vacuum) is applied to the other. The difference in liquid level represents the applied pressure"

Four cylinder - four tubes, all fastened to a board so direct comparisons between the tubes are possible.

[Laava]

You are right Pete but in this case the pressure difference we are talking about is so great that the oil gets sucked through the hose as it does not have enough head to retain in the tube. So it is far easier to compare two pressures, ie, carbs, which should be the same and in fact can be adjusted to be equal.

[NinjaNanna]

Its a KA-0850.

Hey what do you know my bike takes the same filter - did you find a NZ stockist?

[nzspokes]

Hey what do you know my bike takes the same filter - did you find a NZ stockist?

Well they seem a common one but got mine from e-bay.