THis is a Bison Pitts Style muffler that is made specifically for the O.S. Max 55AX 2-stroke engine.
Please Note, this is not a Pitts Style Muffler for an O.S..40/.46... there is a difference. This muffler was manufactured specifically for the O.S. 55 and it allows the 55 to run at it's maximum performance.
It has less than an hour of use and is in as-new condition. The price is $30
Joined: 11/21/2009
Last login: 1/16/2013 4:28:AM
Location: MI, USA
SELLER REPLY:
The bolt pattern on the 55 is the same as an O.S. 46... So if you have a .46 handy you can check the dimension... it measures 1&7/16" or 36.38mm.
I only bench tested the O.S. 55 it was installed on so I really can't speak to it performance. I just know that the chamber size is slightly different than the one that is sold for the O.S. 46.
