I never broke the airfilter strap on my
BX23, but after 120hrs I noticed the strap support brackets had broken off at the base of the bracket, closest to the engine block. I ended up with the
bx22 upgrade kit. I didn't use the clamp assembly only the brackets. However I did notice the upgrade kit appeared to be the same as my original
BX23 kit with the exception of a rubber strip that lined the clamp. The 23 has a foam strip that has double sided tape to keep it adheared to the stap.
I noticed at about 80 hours the backet bolts had loosened and one had completely fallen out. I used some blue locktight and retorqued. Then at 130 hours both brackets had broken off, but the bolts where still tight.
When I reassembled for the last time. Only this time I changed the torquing sequence and torque the brackets to engine block first, then snugged the brackets to clamp assembly, then tightend the clamp. I worked my way out from the block to the air filter.
I don't think this is the same issue ya'll are experiencing, but something I thought you may like to know. Its now part of my daily check and at 150 hrs...so far so good.