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I had a similar experience recently - rough road, bike started miss-firing, running on one cylinder, intermittently on two but hard to tell exactly. One of the plug leads had lost good contact with the cap. The road side fix was cut a half inch off the end of the lead, re-thread into the cap. Good l...

Try a higher viscosity fork oil before doing anything else. I'm using a 10 wt (Belray), and I like the action a lot better.

Some light aircraft engines (horizontally opposed fours) go through oil quickly if you fill them to the top. It blows out the breather tube. At 3/4 full, they stabilize at whatever their consumption actually is. Has anybody noticed this with airheads?

I did, 5 or 6 years ago. I ordered the replacement spline ring, with rivets. I took this to a local machine shop, with the wheel. They drilled out the old rivets and installed the new spline ring with the new rivets.

I changed mine after 30 years (preventative maintenance....), and they were in good condition! I live in a dry and non-corrosive climate, and no ethanol.

Good gas is still available - at local small and friendly airports. You may have to say it's for an airplane, and it's expensive. 100LL is very similar to the leaded premium gas from 40 years ago, in lead content and octane rating. I've run it through my R75/5 (about a gallon per tank) and it works ...

The Moose get annoyed by horns. Nasty looks follow....

Around here, the conventional wisdom (cars and trucks version) is that if you have a choice between hitting a deer, or taking your chances on the rocks and trees, hit the deer. If it's a moose, take your chances with the rocks and trees....

I have a FIAMM horn too. Around here (western Canada), we've adopted political correctness in a big way. We're much too polite to go around honking horns. Weeks can go by without hearing one. Not like other places I've been, where if seconds went by you would begin to wonder what was going on....

I got a pair of sport mufflers from EPCO Stainless a few years back, and a set of headers more recently. Very happy with these products. IMO, the sport mufflers look good and sound good. Definitely not as quiet as the originals, but a long way from obnoxiously loud. I don't think it it totally safe ...

This happened suddenly, and affecting both cylinders?

Is it possible that someone with an evil sense of humour has backed out the idle adjustment screws?