TOPIC:

I need to check my float heights. The manual only gives the procedure using the clear tube to gauge the float height. Does anyone have the measurement just measuring from the carb body to the top of the float?This what I'm trying to use to measure the carbs.

Hello Kenny:

This is what I calculated last winter during my last carb service, using the same Float Height Tool.

After that I confirmed the dry level with a wet level check using the clear tube method. If I recall correctly, I was near the 4 MM level off of the carb body.

FLOAT HEIGHT 27-MM/ FLOAT DROP 36-MM

Regards.

Todd.

Hi Todd,

Are those terms used in the manual? Float "Height" & "Drop". If not would you define them?

I much prefer the wet method but if I knew how to dry set them, that would be a good starting point.

Thanks

Bill

Hello Bill:

No either dry float height or drop is not in the manual. As others have observed, the only measurement mentioned in the manual is a wet float level. Sometimes a very cantankerous task if one has to go back and forth adjusting the float stops.

Almost all carburetors have a Float Height and a Float Drop measurement. (With two separate stops to adjust.)

Float Height: Measurement from the bottom of the carb body to the bottom of the float. This is the maximum float UP travel. For carburetor kits that contain build sheets, float height can be measured from a different place, but during my last rebuild, I measured from the bottom of the carb body to the bottom of the float. It's important that the copper frame to the float is straight and even. they have a tendency to get bent and warped over the years, sometimes from abuse.

Float Drop: Measurement while the floats are hanging down and away from the float valve. This measurement is meant to keep the float off of the carb bowl and to prevent chaffing of the float against the carb bowl.

To be clear our shop manual does not talk about the 27mm Height and 36mm drop distances I used to rough in my float level. After I dry set my floats to these measurements, I found my wet float level near the 4MM level. the actual service limit in the manual is 6.5 to 8.5MM (As measured from the carb body and bowl parting line.)

Even though my level is about 1 to 2 MM above the factory setting, I find it works just fine, with no flooding into the crankcase.