Free Air Weight

447 weight is posted here: https://www.rotax-owner.com/en/support-topmenu/technical-information/rotax-engine-specifications

377... thats pretty ancient!!! but I there is some data on Wikipedia  https://en.wikipedia.org/wiki/Rotax_377#Specifications_(377)

and some additional specs here: http://www.ultralightnews.ca/rotax377/377.html 

RotaxOwner Admin wrote:

447 weight is posted here: https://www.rotax-owner.com/en/support-topmenu/technical-information/rotax-engine-specifications

377... thats pretty ancient!!! but I there is some data on Wikipedia  https://en.wikipedia.org/wiki/Rotax_377#Specifications_(377)

and some additional specs here: http://www.ultralightnews.ca/rotax377/377.html 

I have reviewed the suggested documents

All of them list the weights for the Fan cooled versions. 

I am looking for the weight of the available free air versions that have the Fan / pulleys / belt /tower / and cooling shrouds removed. 

I have seen Guesstimates of anywhere from 3 - 10 lbs.