What's that knocking sound?

My 1915 runabout ran normally when I shut it off. But the next time I started it there was a definite knock because of some maintenance I did. The fix was simple.

[@cudaman-yq7pq]

Well done Steve! :)

[@markmesserschmidt1119]

What kind of add on air breather is that on your car, or is it self made.

[@aqfarn]

Generic air filter from O'Reilly, about $20.