AeroWorks 75cc YAK-54 ARF-QB Assembly Manual page 49

15. Install Pitts style muffler using lock-tite as
shown.
16. Securely tighten the muffler to the engine cyl-
inder as shown.
17. 3W-75iUS side carburetor engine with Pitts style
muffler installed.
Note: there is no requirement to modify the engine
box for muffler clearance
49