New carb socket fits loose

Thanks that clears it up for me. Setup similar to the Rotax drip tray only using sealant instead of the Rotax gasket (why not try the Rotax gasket?) But I can’t figure out how some irregular sealant thickness behind the rubber flange would prevent you from tightening down the carb- that flange is rigid back there behind the socket and your sealant and doubler. Have you tried removing the rubber flange clamp spacer and temporarily substituting something 1-2mm shorter, then tightening the clamp against the shorter spacer with the carb installed?

Considering the angst that this problem has engendered, why not temporarily remove the RV drip tray & spacer, thus returning the system to original Rotax set up - Refit the rubber flange and see if that changes the fit on the carburettor?. This will remove all speculation (RV components/warped manifold/faulty flange and or carburettor) as to the cause of the carburettor/flange problem.😈

Sean has a good thing to try. Process of elimination 

Sean Griffin wrote:

Considering the angst that this problem has engendered, why not temporarily remove the RV drip tray & spacer, thus returning the system to original Rotax set up - Refit the rubber flange and see if that changes the fit on the carburettor?. This will remove all speculation (RV components/warped manifold/faulty flange and or carburettor) as to the cause of the carburettor/flange problem.😈

Completely agree, this is exactly my plan this weekend. Thank you for the suggestion.

Jim Isaacs wrote:

Thanks that clears it up for me. Setup similar to the Rotax drip tray only using sealant instead of the Rotax gasket (why not try the Rotax gasket?) But I can’t figure out how some irregular sealant thickness behind the rubber flange would prevent you from tightening down the carb- that flange is rigid back there behind the socket and your sealant and doubler. Have you tried removing the rubber flange clamp spacer and temporarily substituting something 1-2mm shorter, then tightening the clamp against the shorter spacer with the carb installed?

Modifications like that are not legal, this is an SLSA. It is necessary to find the root cause of this problem.

The irregular sealant thickness can be causing the rubber socket to flex open, if say there is a thicker sealant in the middle versus the edges. This would make sense because the edges are where I had the clamps when I applied the doubler with the sealant.