Been there seen that
Those little critters get into every thing, now when I store my Lawn tractor, Motorbike and sleds, I use steal wool ( bulldog) to block all air breather holes. I never thought of the muffler thought and they filled my Lawn Tractor's full of soy bean seeds.
Yea if you have fan cooled sleds check between the cylinders every season... 2 years ago my brother took our 98 xcf 440 on a decent 75-100 mile trip and on the way back he knew that something was definately wrong then it died... we hauled it back to my house tore it apart and there was a huge mouse nest between the cylinders and corn kernels were stuff in there... yea there was no piston left on that side... it wasnt too cool.
I had nest in both my sleds under the carbs, BIG nests. Thing was, they carried the insulation from a loft, down the bare studs, into the sleds. This season Moth balls, lots of them to keep them out. I stuff a tennis ball in the exhaust. I have from the start.
I have a friends old Exciter here to get ti cleaned up right now. It hadn't been run in a few years, so the first thing I did was pull the air box. It was stuffed clear to the top with corn. He had a bag of feed corn right next to it.
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