I've always used WD-40 or the Walmart version of it, which is just their general-purpose spray lubricant. Vastly cheaper and equally effective. Sometimes my ancient Geo Metro takes exception to a very wet day and becomes cranky to start, but a shot of the lube on distributor, ignition module, and spark plug wires makes it perk right up. Similarly, my various motorbikes have benefited from the same treatment.
Note that if you ride in the rain and your cylinder gets wet the resulting steam will rise therefrom and condense upon any electrical components bolted to the frame above the cylinder. My old Suzuki did this regularly until I jacketed the ignition coil in some sort of raincoat.