Mice. They like to make a mess of things. Like chew through vacuum lines, insulation off of wires, paper from air filters. Makes nests in spots you wouldn't think of. Die in the fan cage of the HVAC, and smell up the car.
I had bought a left over 2007 Honda VFR still in the create in 2008. Broke the engine in, and put some miles on it. Decided to put it on a dyno. HP should have been around 115. It only produced 96.
Knew something was wrong. Back home, I started to go through the bike looking for issues. When I removed the lid to the air cleaner. That's when I found the problem. Had a mice nest on top of the air filter. Found 3 dead mice in the nest.
After cleaning everything up. Replaced the stock filter with a K&N. Went back to the dyno. It made 124HP.
