Mac system gaskets

[Dave T.]

On the rear cylinder, where the "Y" collector clamps to the exhaust spacer manifolds. What size & type gaskets go here? I know that the copper "squish" gaskets to between the cylinder head and the spacers. Does this same set of copper gaskets go in between the clamps also? If not, does anyone have suggestions? It's leaking...

Thanks in advance... ? ?;D

[sdinino]

If I recall, those are doughnut type gaskets. The clamps compress them and seal around the pipe.

Mine leak a bit too, but not enough that I want to tear that apart again... its a pain to reassemble.

[Rick G]

Hi Dave, those are stock Yamaha gaskets, I ordered a set  in 1999 and got them, but first try tightening the  clamps , sometimes they work loose. They are a pain to install but with the help of someone else (on the other side of the bike)  its not too bad , with a MAC exaust . If all else fails pull the rear wheel  for better access.  Rick G

[jasonm.]

If the clamp is not rusted to hell. Then the thin donut rings will fix the leak. If the clamps are still available. You may want those too. Also clean all "clamp discs" which squish the donut rings. They may be carboned or rusted.