650/X-2 Coffman exhaust water line routing

[KER]

Im sure this topic has been beaten to death before, but I need help routing the water lines on a coffman exhaust system. Switching from the stock pipe on my '88 650sx

It would appear after looking at a couple of riders pics some of the coffman pipes have 2 outlets and some have 3. Mine has 3. 1 on top of the header near the motor (inlet from the head), 1 on the outside facing the expansion chamber, and 1 on the back of the header pipe facing the inside.

Not sure of the factory return line to the pump gets capped and left disconnected or what, that seems to be where im not sure what to do. if any one has the same setup and have some pics or a diagram that would be great!

 

[Bob Gruen]

The line to the pump is the 'supply' line, it goes to the bottom of the exhaust manifold. If you put a dual supply line in you drill out and add a second fitting to the underside of the exhaust manifold (and add a few more holes to the manifold gasket) . The water then goes through the manifold, through the restrictor holes in the gasket and into the block. From the block it goes up into the head and out to the front of the head pipe. (If dual supply lines are installed you drill, tap, and add another fitting to the 2nd boss on the head and lead it directly out to a squirter.) The water goes from the front to the back of the head pipe, then from the back of the head pipe out to the fitting on the end of the stinger. It is a good idea to put a T between the rear of the head pipe and the stinger and some form of restrictor on the stinger fitting to dry out the water box a bit.

Not sure what the 3rd fitting on your head pipe is for. It is so close to the supply from the head that I don't see what the point would be, unless you use a Y fitting to cure a hot spot or something...