Name: Buell 2007 LIGHTNING
Brand: Buell
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3-80 2007 Buell Lightning: Engine

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CRANKCASE BREATHING SYSTEM 3.13

GENERAL

See Figure 3-114. Pressure created in the ﬂywheel area on

piston downstroke is released through the

reed valve

into the

gearcase. From there a mixture of crankcase air and oil mist

is vented up the push rod covers to the upper rocker box.

See Figure 3-115. Air is allowed to escape the rocker boxes

by exiting the positive crankcase vent (PCV) valves (4)

located on top of the rocker boxes. From the PCV valves the

air enters the crankcase breather hoses (2 & 3). The crank-

case breather hoses route through the air cleaner base plate

(1) to the air box where it is directed inside the air ﬁlter ele-

ment and back into the engine.

The oil mist collects and eventually returns to the crankcase

through oil passageways in the cylinder head.

Figure 3-114. Reed Valve Assembly in Gearcase

8661

Figure 3-115. Crankcase Breathing System

1. Base plate, air box

2. Breather hose, rear

3. Breather hose, front

4. PCV valves (2)

5. Grommet

6. Rocker cover (2)

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Buell 2007 LIGHTNING Specifications

General