does your bike have the stock exhaust?
I would guess someone took the exhaust connection off at some point, that fell out and they never fished it out from where it fell.
If it was missing your exhaust would be leaking at the back of the head. If its not, someone replaced it.
I work across the street from a GM dealership. When its nice I take a 1 mile walk around the block. Over the years I have found car parts, ball bearings and enough tools to nicely equip a tool box.
Mechanics work on vehicles, take an old part off and set it down, or set a wrench down in the engine compartment, forget its there, and when the car drives off the first turn or curve the stuff falls out in the street.
I read a few years ago the comedian Gallagher also has this habit. He cannot drive anymore for health reasons, so he does a lot of walking, and he finds car parts on the shoulder of the road, and he cant figure out "this part is necessary for the car to run - how did this part fall off, and the car kept going?!"
I also heard about a mechanic who had an old VW with a hole in the floor under the drivers side carpet. People tended to tailgate old VWs because they only have a 50 HP engine. When someone was pissing him off, he would drop old pistons and connecting rods thru the hole, and it looked like the engine was falling apart.
Last edited by KCW; 06-27-2018 at 09:18 PM.