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Dellorto 40 mounting and initial setup  Rate Topic 
 Posted: 09-14-2009 04:24 am
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1st Post

Joined: 02-20-2009
Location: San Rafael, California USA
Posts: 28
I have a few questions for any or our esteemed experts concerning the mounting and initial setup of Dellorto DHLA 40.

1. Where do the rubber washer / thackerry washers go and what is the coil spacing and torque setting?

2. What is the initial air bleed position?

3. Can i mount the carb to the intake manifold on the bench before mounting the assembled unit to the engine?

Carb specs.

Choke 34mm

Main jet 142

Emulsion tube 7772.5

Air correction idle jet 180

Idle jet 58

Idle jet holder 7850.1

Pump jet 40

Start jet 70

Thanks for the help.

Francis G

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 Posted: 09-14-2009 11:57 am
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Judson Manning

Joined: 03-14-2005
Location: Atlanta, Georgia USA
Posts: 406
Opinions will differ, but I'm not a fan of the flexible mounting hardware on the Dellortos due to my past experiences...Strombers are a different story.  What I've done with the Dellortos is make my own gasket material to put on either side of the anti-popping intermediary plates (8 in total).

With 58 idle jets your initial air bleed will be only a turn or so.  I've used 57 and 55 jets on my installations and of course I've needed to add a few turns.  The JHPS club store jettings are a GREAT starting point, but you will need to fine tune the jets to match the exact specs of your engine using a Dyno, CO meter, etc. to get optimum power, mileage, drivability, etc.   If in doubt - run it rich.

Mounting the carbs to the manifold first takes away a lot of the irritation of getting to those bottom 4 nuts.  Go ahead and attach the water line, brake booster, and water temp sensor and mount the entire assembly as a complete unit to minimize the VINO factor...

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