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Krauser 4 valve cylinder heads & pistons.
For BMW Airheads Motorcycles

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. You may want to read the following article:
https://bmwmotorcycletech.info/mod4performance.htm
...and....here are a few hints:
Use the Krauser MK2 heads....they are much better for lower valve noise and stability, etc. Use an R100 series engine. Use the Clutch and transmission from a 1982 and 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 may...at times, ...add commentary to this article about installing and using these heads....ETC!

https://bmwmotorcycletech.info/1.jpg

https://bmwmotorcycletech.info/2_3.jpg

https://bmwmotorcycletech.info/3a.JPG

https://bmwmotorcycletech.info/4_5.jpg

https://bmwmotorcycletech.info/6_7.jpg

https://bmwmotorcycletech.info/8_9.jpg

https://bmwmotorcycletech.info/10_11.jpg

https://bmwmotorcycletech.info/12_13.jpg

https://bmwmotorcycletech.info/13a.JPG

https://bmwmotorcycletech.info/14_15.jpg

https://bmwmotorcycletech.info/16_17.jpg

https://bmwmotorcycletech.info/18_19.jpg

https://bmwmotorcycletech.info/20_21.jpg

https://bmwmotorcycletech.info/22_23.jpg

https://bmwmotorcycletech.info/24_25.jpg

https://bmwmotorcycletech.info/26_27.jpg

https://bmwmotorcycletech.info/28_29.jpg

https://bmwmotorcycletech.info/30_31.jpg

https://bmwmotorcycletech.info/31a.JPG

https://bmwmotorcycletech.info/32.jpg

Krauser Facebook group:
https://www.facebook.com/groups/409347085872025/

Installation manual, on-line format:
Not a Dropbox member? A Notice may (or may not!) 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.
https://www.dropbox.com/s/pvq1z7wi8xvtn48/Krauser%204V%20Manual.pdf?dl=0

There is a fair amount of Krauser company products literature here:
http://beemergarage.com/literature.html

Rev:
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.
07/21/2020: Minor cleanup

© Copyright 2020, R. Fleischer

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Last check/edit: Sunday, December 13, 2020