Had to pull my rear master cylinder off and to do this I had to pull the rear exhaust pipe off,it has stock exhaust with a crossover pipe,I noticed that the crossover pipe was closed on the inside. Is this normal and if so what's the purpose of the crossover?
Thanks

 

What bike?

No, that's not normal. Someone was playing with it.

 

It"s a 95 FXDWG,the pipes are stock,looks like it came like that no welds on the inside of pipe.

 

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Purpose is so each cylinder shares both exhaust. This works well on a two cylinder that fires opposite of each other. One cylinder helps clear the exhaust from other cylinder.

On stock exhaust, it's just a small pipe on back side connecting the two headers. Obviously, if it's plugged, someone did it. Didn't come that way.

 

The crossover pipe is plugged on the exhaust pipe for the rear cylinder. looks like it came from factory like that.

 

Probably a cup type freeze plug someone drove in to make it a "true dual." Won't hurt anything, but won't help anything either...

 

On the early model Evo FXR like my '86 the balance pipe was not aesthetically pleasing. The crossover serves as a balancer and IMHO the bike runs better with it. Not a big difference but a difference. Later they reconfigured and hid the crossover so you could not even tell it had one. The first thing most people did on the early Evo FXR's was put on an aftermarket exhaust system that did not include a crossover. A lot of my friends went with a 2 to 1 header which also balances the pressure and they run great on the Evo or even a TC for that matter. I have never heard of one being plugged from the factory. I am interested in finding out if someone knows what's going on with your bike. I would lean towards someone altered the crossover somehow.

 

We're gonna needs some pics of this plugged crossover tube.

carl

 

I'll get some pics posted tommorow. Gonna see if I can get it out. It does look like a freeze plug.

 

Great topic. Thank you, OP.

'20 Heritage with a hidden crossover pipe on stock exhaust. I'm trying to learn the reasoning for a cross over pipe. I'm thinking the following but do tell me where I'm wrong -

- Allows both cylinders to use both mufflers during exhaust stroke reducing noise and back pressure
- Provides a vacuum doing value overlap to salvage any exhaust from the intake value of next cylinder to fire

Several explanations I read said that a crossover pipe gives a slight increase to torque and HP at low and mid range RPM. I assume this happens due to the two benefits above?