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Krauser 4 valve cylinder heads & pistons.
For BMW Airheads Motorcycles
Copyright 2019, R. Fleischer

NOTE:  If you are trying to build an Airhead with very high power output, you may well want to consider using the Krauser 4 valve heads.  For such an engine, you want, for sure, to read the following article: are a few hints:
Use the Krauser MK2 heads....they are much better for lower valve noise and stability, etc. Consider using as a base engine, clutch assembly and transmission, from an R100 from 1981 or later. Consider using a Siebenrock 1070 kit (it has very light pistons too) and a performance camshaft to match that kit. Use at least 9.8 compression ratio, and if the fuel is available, use about 10.3 (but not higher).  I suggest a lot of modifications to the entire motorcycle, including brakes and suspension.

Below are a collection of scans of original Krauser information.  Plus a link to a Facebook Group.  I times,  ...add commentary to this article about installing and using these heads....ETC!

Krauser Facebook group:

Installation manual, on-line format:
Not a Dropbox member?  A Notice may ask you to sign in or join.  After a few moments, that either drops away & the manual appears; or, there is a place in the Notice, to click to view the manual. 4V Manual.pdf?dl=0

There is a fair amount of Krauser company products literature here:

1st. released:  0608 pcst, 05/31/2015
02/08/2016:  Add dropbox link, obtained from Airheads list this day.
03/06/2016:  Metatags and layout.
08/18/2016:  Metas, H.L., a small amount of layout change, clean up html some.
02/10/2018:  Cleanup.  Add 10pxl margins.
02/20/2019:  Add notes on Mk2 heads, etc.

Copyright 2019, R. Fleischer

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Last check/edit: Monday, July 22, 2019