Crankcase Breathing System - Buell 2002 X1 Handbook

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CRANKCASE BREATHING SYSTEM

GENERAL
See Figure 3-52. On piston downstroke, a mixture of crank-
case air and oil mist is vented up the push rod covers (1)
through an umbrella valve (3) in each middle rocker box sec-
tion.
The oil mist separates from the crankcase air, collects and
passes through a small drain hole (2) where it eventually
returns to the crankcase.
The crankcase air is routed through a passage in each cylin-
der head. The air then travels through each air cleaner
breather bolt (4). Hoses leading from the air cleaner bolts
deposit the air inside the air cleaner's snorkel.
2002 Buell X1: Engine
b0143b3x
1
4
1. Push Rod Cover (2)
2. Oil Drain Hole
3. Umbrella Valve
4. Breather Bolt
Figure 3-52. Crankcase Breathing System,
Typical Cylinder
3.11
3
2
3-35