Michael and Waterblue - On Donner Lake, in the high Sierras where I run the beast, during the spring and early summer, there's a ton of pollen in the air from all of the trees. It gets deposited everywhere. There's also a heavy coating of pollen on the water near the shore during this time.
Since I only have automotive experience, I would have thought that an air filter would be part of the design of any internal combustion engine, but clearly that's not the case.
Thanks,
Dick