What is float height and how do you set it on the Animal / World Formula?


What is float height and how do you set it on the Animal / World Formula?

The float height controls the fuel level in the bowl of the carburetor. As the engine runs and draws fuel from the bowl, the float drops and the float height adjustment determines the point at which the inlet needle valve opens to maintain the desired fuel level.

If you have a suspected carburetor problem the float height should be checked before any other changes are made.You will then have a starting point to optimize the float level for your engine, track, and mounting configuration. Too low of a fuel level can cause a sputter or miss while cornering or a lean condition at the end of a long straight run. Too high of a fuel level can also cause flooding and a sputter or miss while cornering or on a rough track and excessive overflow from the bowl vents. Experimenting with this height may help to overcome these problems. Adjustments should be made in small increments of about 1/32 of an inch or .5 mm.

Setting float height

To set the float height, turn the carburetor upside down and measure from the flat gasket surface on the carburetor body to the bottom (as installed) of the float. It is best to use a sliding caliper or a 6″ steel rule for an accurate measurement.

The float should be resting on the inlet needle but not depressing the spring loaded stem of the needle. Bend the tab over the inlet needle up or down to obtain the correct measurement.

PZ22 – 22.0mm or .865″

PZ26 – 14.0mm or .550″

Note – Track conditions (straight away length, tighness of corners, riding curbing, etc.), engine mount angle (flat vs.15 degree), track roughness, and chassis balance can all impact float setting.

Quick tips

PZ22 – Holding the carburetor upside down the bottom edge of float will be even with the bottom of emulsion tube.

PZ26 – With float resting on inlet needle the float will be level with the bottom flat edge of carburetor body.

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