Several pictures to show the stages of the project. These horns are louder than the FIAMMs I have now, and have a nice disonance with their 500 Hz and 300 Hz tones. I wanted a low forward-facing mount, and the space below the timing cover seemed an obvious one. Cooling air will still reach the cylinder fins. I'm not very worried about dirt on the horns, my front mudflap does a hella nice job keeping the debris off the bike.

I'll spare you the details of designing and constructing the bracket. It should work just fine, I'll mount it to the smaller hole on the boss at the bottom of the timing cover. That hole takes an 8x1.25 mm tap just fine, and the bracket will be supported on its sides against the insides of the timing cover.

Why go to all the bother of milling a piece of aluminum for this? I'll admit, I was looking for a first project on the new Smithy lathe/mill combo, and this was all good practice. I'll put up more pictures when the horns are mounted on the bike.

What they look like with the timing cover in place.

And with the timing cover removed.

This shows the boss with two holes at the bottom below the pulley.

Front view.

Rear view, with relief for sitting on top of the boss.

Three stainless 8x1.25 mm bolts, the bracket and the horns. The bracket is tapped for the two horn bolts, the mounting hole has clearance for the 8 mm bolt.

It helped to have a spare engine for taking measurements! The jealous R80 will be keeping its dual FIAMMs.