Dell'Orto Adaptability

["roger kaplan"]

I have a pair of Del  PHM38SD carbs that came from some KTM 400 singles. I would like to use them on my '76 R90S but I notice there are some differences between these 'SD' carbs and the OEM PHM38BD/BS units. Can anyone tell me what mods or adjustments are required to successfully use the 'SD' carbs on the '76 R90S? Are there any sources I might try?  TIA

["obie311"]

https://advrider.com/f/threads/rebuildi ... or.635497/

Looks like it doesn't have an accelerator pump. Remember there's a right and left version of the PHM for twins. The throttle stop (idle) adjust screw and the air mixture screws have to be accessible for tuning.

Not sure how the "hot start" button works but there's been many a time I wish I had one on a piston airplane.

["roger kaplan"]

Thanks for your reply. I'm aware of the differences between the BS/BD model and the SD. The SD has the casting boss for the accelerator pump so I'm hoping the proper passageways are present inside. The fast start (cold start?) circuit has me baffled. Jets, needles, and other internal bits are interchangeable. I know I can make this work with enough information. It's out there. Thanks again. Roger

["Richard Chawes2"]

Try this out for size: http://www.iwt.com.au/private/Dellorto%20manual.pdf

Richard Chawes

[rogerh8808@gmail.com]

Thanks much for posting this link.  I'm sure it will be very helpful.
~Roger Hoffmann