Join Date: Apr 2019
Location: Fredrickson, Washington
Allow me attempt to clarify any confusing statements I may have made. In the picture you see a standard looking setup of two exhaust pipes coming from the cylinders of a V-twin motor.
As we know the pipes that you actually see are normally just covers for the real exhaust pipe (or tube) that resides within.
The forward pipe that you see here is like that, a fully functioning "exhaust pipe". It gets hot when the motor is running because the actual exhaust tube inside gets hot as all get-go. Fine.
The rear pipe that you see does not even touch the head. It is completely hollow inside with no exhaust gases flowing through it. It is there for decoration only.
The rear cylinder actual exhaust tube that really exhausts the gases, is almost entirely hidden. From the rear head exhaust port, the bare tube then drops vertically down until it hooks into the goat's belly which then goes into the upper muffler corresponding to the rear cylinder muffler.
If you touch the rear cylinder pipe when it is running, it'll be cold because there is nothing in it. The rear cylinder muffler, however, will be hot as gases do pass through it.
Did this clear up any confusion?