General
Operation
See Figure 4-2. The crankcase is vented to prevent a buildup of pressure caused by the downward force of the pistons.
The breather system sends crankcase vapors, via the timing chain opening (5), to the induction module (1). The vapors mix with the intake air. Then they are burned during normal combustion.
Flow
1. See Figure 4-2. Fuel vapor flows through:
- a. Timing chain opening (5).
- b. Baffle (4).
- c. Outlet from cylinder head cover (3).
- d. Breather hose (2)
- e. Inlet to induction module (1).
Note: Baffle (4) restricts oil spray from entering the hoses to the induction module.
![](https://motoinstruction.ru/img/harley/22/127761.jpg)
Figure 4-2. Breather Operation: 1. Inlet to induction module; 2. Breather hose; 3. Outlet from cylinder head cover; 4. Baffle; 5. Timing chain opening