On May 21, 5:07*pm, bpuharic wrote:
i dont think mine are...but just curious about the warning signs...

Are they used in Salt, or Fresh Water?

Cracks on the outside ( you'll see rust stains ) . Cracks on the
inside are hard to immediately see. Over heating is a sure sign. Using
clear tubing while idling...do you see any bubbles passing through? I
just rebuilt my 40 year old Risers over the winter. Soaking them in
Pickling Vinegar worked great to clean them out. After that, I scored
out the cracks very slightly with the Dremel, and put a nice coat of
JB Weld over top, followed by a coat of Tremclad white.The finishing
touch was to paint the Exhaust Stubs with High Heat Enamel. They do
look nice now.