Help with identifying mufflers

[Clasec]

How can you tell if these are A-12815 or A-12739-1B? Thanks Charles.                                                                                                                                                                                                                                                                                                                                                                                                                   650/750 muffler-3 by Clasec, on Flickr                                                                                                                                                                                                                                                                                                  650/750 muffler-2 by Clasec, on Flickr                                                                                                                                                                                                                                                                                               650/750 muffler-1 by Clasec, on Flickr                                                                                                                                                                  

[undee70ss]

Will a 1/4 x 20 bolt fit in the holes that mount to exhaust port?

[Clasec]

May 1, 2019 20:22:22 GMT -5 undee70ss said:

Will a 1/4 x 20 bolt fit in the holes that mount to exhaust port?

Yes it will. Thanks.

[5terrysupersaws]

The muffler on the right in the first pic is a 750  #A-12739-1B, on the left is a 650 #A-12815
The 750 uses 1/4 x 3/4 mounting bolts, the 650 uses 10-24 x 3/4 bolts.

[Clasec]

May 1, 2019 20:38:26 GMT -5 5terrysupersaws said:

The muffler on the right in the first pic is a 750  #A-12739-1B, on the left is a 650 #A-12815
The 750 uses 1/4 x 3/4 mounting bolts, the 650 uses 10-24 x 3/4 bolts.

The picture makes it appear one has smaller holes than the other but they are the same. A 1/4 bolt fits both mufflers. Thanks to all for the help. Charles.

[5terrysupersaws]

May 1, 2019 20:45:27 GMT -5 Clasec said:

May 1, 2019 20:38:26 GMT -5 5terrysupersaws said:

The muffler on the right in the first pic is a 750  #A-12739-1B, on the left is a 650 #A-12815
The 750 uses 1/4 x 3/4 mounting bolts, the 650 uses 10-24 x 3/4 bolts.

The picture makes it appear one has smaller holes than the other but they are the same. A 1/4 bolt fits both mufflers. Thanks to all for the help. Charles.

 Aw Snap ! An optical illusion ! ... 

[undee70ss]

The mufflers can be used on 650 S650 750. Early 650's cylinder must be drilled and re tapped to 1/4 x 20. There is a memo on this.

[undee70ss]

May 2, 2019 3:54:34 GMT -5 undee70ss said:

The mufflers can be used on 650 S650 750. Early 650's cylinder must be drilled and re tapped to 1/4 x 20. There is a memo on this.

See Dealer Service memo 676 dated 11-76