Homemade Silencer core

I purchased my 1984 cr 500 at a yard sale for $100. I've slowly been putting money into the bike here and there, but trying to stay inexpensive where I can.

The bike has a cobra silencer with a spark arrester but it had no core and as you can imagine was quite loud.( I could feel each pulse of the engine in my eardrum)

I decided to build my own core. After removing the spark arrester I found that the 1 1/4 pipe leading into the canister protruded a bit into the can. I found a thin piece of pipe from a halogen light stand.I sliced into it every inch and then offset the next row until I had four rows. I then heated each section with a torch and puched it in to make a louver.

I was planning on welding legs to the core and riveting them to the side of the can. After test fitting the core I found the spark arrester had a protrusion in the middle as well. I decided to extend my core a bit so when I tap the arrester on it would support the core.

After wrapping the core in glass and installing it, we used my brother's iPhone to test the decibel level. It was maxing out at 100 db but averaged around 98 db. According to the forest service the limit for this era bike is 101 db.

Sorry if the pictures don't match the storyline.

My mate rolled up on his new/ish HD Fri eve, looks like the same baffle core used in Vance and Hines pipes.