ORIGINAL: opjose
ORIGINAL: Mr67Stang
I had this plane and flew it with an OS .50sx and used the bolts from the stock muffler for the Pitts muffler and had no problems.
Were the bolts from the .50SX a bit longer?
If I recall correctly ( it's been a while since I put it together ) the stock bolts on the .46 were about 1/4" too short for the Pitts Muffler.
The bolts on the OS .46 FX/AX, .50 SX and .55 AX all go through the back side of the engine block and screw into the muffler (not through the muffler into the engine block) so you have just as much thread into a Pitts muffler as the stock sport muffler.