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The Dell'Orto Carburetor
BMW R90S Airhead motorcycles, other bikes, & some cars!
(Also covers Dell'Orto functions & operation; especially for needle/slide types.)
© Copyright, 2017, R. Fleischer (my portions only)
There are many sketches and drawings in this article. Allow time to load if you are on a slow connection. There are comments from me scattered in the article, note particularly that near the very end of this article is considerable information from me on adjustments for the R90S carburetors.
In black and white:
That is a link to page 3 of that manual (you can modify that url for the home page or other manual pages), showing the fuel level adjustment. See also section 2, in the generic Dell information well below.
Besides the main article, below; which has my notes, etc., in it, you may want to overload yourself (?) by reading these two articles, which are from the DellOrto manuals themselves. These are .pdf files, so are very usable.
If you can stomach all this reading and absorb and understand it all ...you could become a DellOrto expert!
Be sure to see the information on the floats, it does pertain to Airheads, this is in section 3.2.2. See also near the very end of the long article below that you are reading, where there is my information on the pump setting and float setting, as pertains to BMW Airheads specifically! There are hints there too!
The following information article came from, I was told, the .startwin.com site, and was sent to me in a zip file, which I have unzipped, modified, and put below. I have been unable to find the author or person who might, or might not, have copyrighted this information, so as to gain official permission to place it here. This article, whatever its original source, now appears to be public property. I tried to make sure about that, so, on 10-06-2003, I sent e-mails to van Star Twin Motors, the Startwin.com folks, asking about use and copyright. There has never been a reply. I last viewed their website in November 2017, and there is nothing about the carburetors.
I have added my own comments to the article prefixed by ***, and underlined. I have corrected many typographical errors and misspellings in the original article ...and changed to U.S. type English spelling and usage. I have also eliminated some in-article hyperlinking, etc. There are places that my comments now are not all that clearly identified, as I wished to eliminate red color I used in earlier versions of this article, which resulted in gaudiness and an unprofessional look to the article; so this latest version generally uses asterisks and underlines for personal comments by me as well as for normal emphasis. I have also modified how the original's photos are formatted and placed, and added borders, and I also prevented wrapping of text around the photos.
The following informational article can be quite useful for those trying to understand how any carburetor works. While the information does not deal directly with Constant Velocity carburetors, it does deal with needle & slide carburetors, & a vast percentage of the information applies to all types.
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