Dynojet A/F Meter

brewsky · Post by **brewsky** » Tue Jul 12, 2011 5:35 am

Thanks for the encouragement, Jensen.

I am still unclear on how you measure your initial float level setting....from the carb body cutout or from the gasket surface? The difference between the two references is 1.5mm +

Thanks

jensen · Post by **jensen** » Tue Jul 12, 2011 6:42 am

Hi,

I'm sorry that I forgot to mention, but that's because I don't measure the float hight that way.
Honda did manufacture all (almost all) carbs within the same design idea, when you look at Honda carbs they have one thing in common, the float is set correctly when the float arm is parallel with the float chamber base when just touching the float valve pin. In almost all original manuals with pictures showing the carb float hight, you will see it drawn this way, this is absolutely no coincidence, I do this for years, it works.

Setting the float with callipers or any measurement tool is like Quantum Mechanics. As soon as you measure it, the measurement tool becomes part of what you measure, there for not reflecting the real measurement.

The only thing you need is a sharp eye and your hands (and the carb of coarse).

good luck, and let me know how you experienced it,

Jensen

brewsky · Post by **brewsky** » Tue Jul 12, 2011 7:52 am

Thanks for the reply, Jensen.

I appears to me that the most important measurement is "H" (distance from 6 to 7) in the last pic you attached. Do you have any published values for this distance for PW22 carbs? This would be the actual distance from the fuel level in the bowl to the bottom of the carb bore.

When I set my 750 carbs, I use clear tubing from the bowl drains running up beside the carbs as a check for equal bowl fuel levels. This method could also be used to measure the actual distance "H", if you knew what value "H" is supposed to be.

jensen · Post by **jensen** » Tue Jul 12, 2011 8:22 am

Hi,

Manual says 26, 5 mm or 1.043 in,

Jensen

Wilf · Post by **Wilf** » Tue Jul 12, 2011 8:59 am

'h' is shown in the manual as 26.5 mm

'H' is not in the manual

Wilf

brewsky · Post by **brewsky** » Tue Jul 12, 2011 9:13 am

Wilf wrote:'h' is shown in the manual as 26.5 mm

'H' is not in the manual

Wilf

Exactly! Wonder if it is published anywhere? The manual even states that is the critical value but doesn't give it.

Thanks Wilf

Wilf · Post by **Wilf** » Tue Jul 12, 2011 9:48 am

I can't imagine a value for 'H' being published anywhere. It simply refers the fuel level in the bowl, which is indeed critical. I don't think 'H' was ever intended to be measured directly, and that's why it must be arrived at by using the rather ambiguous float height measurement.

If Honda had provided a few inches of clear tubing and a reference mark on the outside of the carb bowl we wouldn't be having this discussion! But even had we been so lucky as to have that, there would still be variables in the mix: jets, bleed holes, needle wear, temperatures,....

'H' is attainable, but in most cases will result in proper fuel metering only by accident, divine intervention or black magic.

Wilf

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