Installing a Crankcase Breather.

This is a fairly simple project that requires very little time and effort.  The idea is that when the crankcase breathes under pressure, it can push a little oil into the breather box.  I have found oil in the carb throat and that can’t be good for performance.  By re-routing the breather line into it’s own filter element, you eliminate the possibility of oil getting into the carburetor.  Many have also commented about the mess that the oil makes on pipes using an aftermarket breather box.
All you need is the breather itself (I found mine at a swap meet for $12.00…) and about 3 feet of fuel line.  The fuel line works well because it won’t collapse around corners.  You will also need to cap off the inlet at the back of the breather box.  I found a cap-off end at the local automotive store.

Here’s how it’s done:

1. Remove the tank.
2. Remove the hose that runs from the top of the rear cylinder to the back of the breather box.
3. Remove the side covers.
4. Connect the new line to the top of the cylinder head.
5. Run a wide loop from right to left, and toward the rear.
6. Route the hose down between the frame and the oil tank (photo).
7. Measure and cut the line down by the passenger peg.
8. Remove the front bolt that holds the passenger peg and use it to hold the breather in place.
9. Connect the line to the back of the new breather.
10. Cap off the inlet at the back of the breather box.

Tidy everything up and your done.

The breather can be mounted on either side.  I chose the carburetor side because I thought that the breather complimented the Big Air Kit.

Mount using the passenger peg hardware...

Route the crankcase breather hose as shown...

I braided the end of the hose for a cleaner look...

Home...

Very subtle installation...