I have two YS .91AC engines and they have all shed their mufflers due to vibration. I tied them onto the plane so they just dangled in the breeze. Now the lower cap has fallen off of them. My plan is to have a friend machine new caps. Does some one know the thread size? otherwise I will just tap the sides and hold them in place with set screws.
Also would some one measure the ID of the exhaust Outlet so I will know what size to make mine?
Thanks
Sparky
And if you a have one that you are not using I would buy the one from you to copy/use.