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From the bmwmotorcycletechinfo.com site
"There was no oil filter such as a paper pleated filter, as there is on the 1970+ Airheads. On the /2, the oil from the oil pump was 'filtered' by sending it into closely separated plates or plate and backing, that were part of the crankshaft assembly. One plate is called a slinger, where the harsher of the contaminants would be deposited into a hard layer along the edge of what was actually a shallow cup. The capacity of the cavities was limited. If the slingers were not cleaned at reasonable intervals (you will not think the mileage reasonable! ...30,000 miles!), the slingers could fill-up, clog the oil passageway, & some very expensive engine parts would be ruined"
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Jerry
1983 911 SC/Carrera Franken car, 1974 914 Bumblebee, 1970 914-4, 1999 323ti
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