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Crankcase breather — Harley-Davidson patent US5233967A (1993)

PatentUS5233967A
TypeUtility patent
Filed1992-05-05
Granted1993-08-10
InventorRichard A. Peller
SystemEngine

“A breather system for a motorcycle engine having at least a pair of cylinders, an air cleaner, a cylinder head on each cylinder, a valve for connecting the cylinder head to the crankcase for venting the same, a first pipe having couplings at the opposite ends thereof for communicating the pipe to…”

Full patent textDownload PDFShop engine parts

Drawings (2 sheets)

Crankcase breather — sheet 1Crankcase breather — sheet 2

Parts for this system

32-0064
Magneto to Crankcase Oil Seal Ring and Gasket Kit
$6.35
14-0555
Rear Caliper Piston O-Ring
$10.64
15-1380
Rear Master Cylinder Gasket Kit
$10.64
23-0825
Handlebar Master Cylinder Piston Cup
$10.64

Check fitment first — add your bike and we flag what fits.

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Drawing from the US patent record (via Google Patents). A patent shows the invention as filed, not necessarily the production part on your motorcycle — confirm fitment for your model and year. Independent aftermarket retailer, not affiliated with Harley-Davidson, Inc.