Somewhere I read a tip that the sub air filter should be checked every now and then. I checked my 1993 St1100A with 104,000 miles and the filter had a hole in one end and it fell apart in my hand as I took it out. The filter box is just in front of the carburetor air filter in a little black box with a hose attached to either end. This an easy thing to check when you have the fuel tank/air box plastic off (2 bolts and 2 allen head screws).
I took a new foam filter for my mower air cleaner and cut out a replacement filter with a band saw. That way I wouldn't have to wait for a factory replacement part to arrive and it may have saved me some money.
I took a new foam filter for my mower air cleaner and cut out a replacement filter with a band saw. That way I wouldn't have to wait for a factory replacement part to arrive and it may have saved me some money.