I have a OS61 FS & OS 60 SR I need....
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RE: I have a OS61 FS & OS 60 SR I need....
Those things have a really weird bolt pattern. I believe, if I remember correctly, it is 34mm between bolt holes while the SR and FX are 42mm as are a good many other brands. The only muffler I know that will fit is the OS 744 muffler. But now let me confuse you even more. OS makes two versions of the OS 744, one with the 34mm pattern and the other with the 42mm pattern. So if you find one online, make sure it is the correct pattern. SlimLine also makes a Pitts style muffler with this 34mm pattern but I have forgotten the part number for it.
I just found the SlimLine number. It is 3213. Good luck. These things are scarce as hen's teeth.
I just found the SlimLine number. It is 3213. Good luck. These things are scarce as hen's teeth.
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RE: I have a OS61 FS & OS 60 SR I need....
OK, that's a 42mm bolt pattern. There are thousands of them out there. Now you need to determine how it bolts to the engine. Are the threads in the engine case or in the muffler? Do the bolts go through the muffler and thread into the engine case or do they go through the case and thread into the muffler?