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 Posted: 10-25-2018 01:59 am
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Esprit2

 

Joined: 05-01-2005
Location: Minneapolis, Minnesota USA
Posts: 575
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 The Workshop Manual specifies an SU AUF 300 pump as standard. That pump's pressure output is 2.7 psi 'minimum' (2.7-3.8 psi range). Flow losses through the plumbing, and an elevation difference between the pump outlet and the carb inlets will result in a slightly lower pressure at the carb inlets. The carbs, both Zenith-Stromberg & Dellorto prefer 1.5 - 2.5 psi. 2.7 psi is a little high for a Dellorto. Z-S carbs can tolerate 3.8 psi, but they work better at ~2.5 psi.

Regards,
Tim Engel

Last edited on 10-25-2018 02:00 am by Esprit2