My S200 ran fine on 87 for the most part, save, as noted in another post, on a 100F day doing WOT/freeway speeds once. Got a bit of ping that day, so backed it down and added some high octane non-eth at the next fuel up.
Oil. Depends a bit on the weather & specific bike. 10/40 for the most part for me in my air-cooled 2 valve S200.
What octane gas is recommended? Does anyone have a favorite oil and what viscosity? Thanks for your suggestions.