Floats

Ken, you are right that the weight, as such, is not the important thing, but it is a proxy for buoyancy, or how high these things will float in the fuel.  If the dimensions/volume are/is the same (they can't be too far off and still fit), they must have the same weight to have the same buoyancy.  I believe it was Archimedes who first famously figured that out.  ?

Tyler, of course what you say is true, but it is unrelated to my point, which I will try to re-state. If the reasoning behind Rotax's weight requirements on the floats is that once they reach the specified weight, they lack the bouyancy required to work effectively, then it would be important that any replacement float not exceed that weight. On the other hand, if the reasoning behind Rotax's weight requirements is that once the floats reach the specified weight, they have shown themselves to be failing, or likely to be failing, then it is entirely possible that a set of floats that exceeds the Rotax weight requirements might work just fine, provided they are immune from absorbing fuel. I won't belabor the point any longer.

All right, well let us know what you find out about the actual specs on these things.

Marvel-Schebler responded to my inquiry regarding the weight of the floats with this:

"The MS80-430 float print does have a weight call out. This call out will ensure that a pair of MS80-430 floats weighs less than 7g."

I did 2 years ago an overhaul of carburators with kit 889534, I wonder if floats here are afected from recent SB-912-074UL?

thank you