Accidentally found a really easy and effective way to test for exhaust leaks. Whether or not you think it does anything for you, If you spray a little Seafoam in your carb and twist the throttle that white smoke will pour out of any small leak. I didn't even know i had one, Its so small it doesn't affect anything but i thought it was interesting and should share it.

 

Good tip and very easy to do. A built in smoke machine...lol
Now if it would do intake leaks too.....

 

Propane torch (unlit of course) if the idle picks up you have an intake leak