AWPER wrote:
Doing maintenance on my GTS. Inspecting the belt and so in and noticed that there is a small sponge filter. I cant seem to find any references on how to clean it. Do i clean it just like the air filter?
You might start a new thread with this question to get fresh eyes on it. That said, I removed mine completely, if you're referring to the foam element that goes over the inlet to the transmission case.
A highly respected Vespa mechanic once told me that those things only collect road dirt and grime that would otherwise be blown out the back, posing little threat to the belt itself. He also said that heat is the #1 enemy when it comes to early belt failures, and if that filter element gets plugged up so that no air can move through - you guessed it - heat buildup!
I've had mine out now for a couple years and several thousand miles with no (yet noticed) untoward side effects.
YMMV.