Questions about exhaust pipes

So while shopping online today, i realized the pipes on my 73 750 are the belled MKIII style, without a cross pipe. Here's a photo of the three pieces that came out when i took it apart, the collet's i know, but whats the other part? Is it OK to use this style on a 750, with 750 nuts, and the collets? or should i buck up and buy some new 750 style pipes (i was looking online because mine are a bit worn out looking, when i noticed mine were "wrong")

kevbo82 said:

Click to expand...

The item on the left is the spherical seating for Mk.3 pipes which goes into the head first and is used in place of the pre-Mk.3 crush washer, the Mk.3 collets also have a slight chamfer to fit the Mk.3 flared pipe end.


http://www.oldbritts.com/nor_mk3_75_26.html
http://www.oldbritts.com/1975_g26.html
Note that the item numbers (31 & 32) are swapped over in the parts books.

I've been using the 1975 style header and mount setup for years without the exhaust nut ever coming loose on my 1974! :wink:

bmwbob said:

I've been using the 1975 style header and mount setup for years without the exhaust nut ever coming loose on my 1974! :wink:

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Bob,
are you using the shorter 850 exhaust nut? i have a brand new set of the 750 nuts, and i feel like they're too long for this setup (i bought them not knowing any better thinking, hey i've got a 750!)

kevbo82 said:

bmwbob said:

I've been using the 1975 style header and mount setup for years without the exhaust nut ever coming loose on my 1974! :wink:

Click to expand...

Bob,
are you using the shorter 850 exhaust nut? i have a brand new set of the 750 nuts, and i feel like they're too long for this setup (i bought them not knowing any better thinking, hey i've got a 750!)

Click to expand...

Look like the big nuts to me :roll: