Originally Posted by
motoman326
Old thread but I hope it gets revived....I found one of these in a collection but I need a muffler extension for my biplane. Anybody know what is the OS equivalent?
Thanks
John
the OS 61 to 91 all have the same mounting spacing and bolt size. the OS 91 muffle is larger than the 61, but the 91 muffler should produce a bit more power on the Towers 75 than the 61 muffler would. you should ask on RC Groups for a muffler, I am sure some one will have one, just make sure you tell in your add that the flange must be good so it will seal well
oops, edit, BTW, if you could find an OS Carb for it you may find the 75 may be easier to tune.
Jim