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REF: Engine Mechanicals - Sub-05F

Installing a Buell Rocker Box / Breather System on an Evo Sportster

1)

Some have reported better engine breathing and less oil leaking out the breather valve by using these Buell rocker boxes.
(along with their corresponding breather valves (17607-00Y).
1991-2003 Sportsters will get rid of the middle spacer, eliminating one more gasket that could leak.

Parts Needed:
17605-00YB1Front Rocker Cover
17642-02A1Rear Rocker Cover
17606-00YA2Viton Grommet (black)
17607-00Y2Breather Valves (called pcv valves in the parts catalog)
88281/4“ x 20 x 7/8” Hex Socket Head Screw w/ washer
(you can also use your old ones)
63858-498Fiber Washers
(you can also use the aftermarket copper washers)

In the pics below, Buell rocker boxes were installed on a 1200R with XB heads using the Buell style rocker box mounted breather valves. The OEM XL breathers were removed.
The rocker box mounted breather valves replace the OEM XL breather / umbrella valves. Vent lines off the breathers were tied together, into a catch can and to the rear of the bike.

Both breather valves are connected to a ‘Y’ connector that runs along the frame under the tank. 2) The tube
comes down into a catch can that can be emptied when it gets too much oil in it. On a long hard ride the
catch can will clean its self out.

The tube from the catch can runs up under the fender and exits at the rear on the left side of the bike. When the bike is on the jiffy stand the hose is way over the side.
If some oil drips from the end, it’s not near the tire and there is no oily mist spraying over all the bike while riding.

Oil from catch can on left side under fender. 3)


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