Exhaust flap size

[steve_93_skiray]

Hi,

I pulled my 93 ski ray spitfire out the other day did the winter and noticed the exhaust flap was gone.

I forgot for measure it to order a replacement.

Would anyone know if it’s a standard size? I see lots of 4” for sale etc. on amazon.

Also, could I have somehow damaged the engine/exhaust without having the flap?


Thanks!