Vintage BMW Motorcycle Owners




Knowledge Base




Snowbum's BMW Motorcycle Repair & Information Website

The above ads are Google-sponsored.
Nearly every page in this website has them at the top (ONLY!).
Clicking on ads at every visit helps support this website.
Clicking on something INSIDE advertisements helps even more!!
Thanks! ...and thanks also, for the website upkeep donations!

Krauser 4 valve cylinder heads & pistons.
For BMW Airheads Motorcycles
Copyright 2020, 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.  You may want 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.  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 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 (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.

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.
07/21/2020:  Minor cleanup

Copyright 2020, R. Fleischer

Return to Technical Articles List Page

Return to HomePage

Last check/edit: Sunday, December 13, 2020