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914World.com _ 914World Garage _ Dellorto question

Posted by: 1bad914 May 7 2008, 06:10 PM

74 2.0 with Dellorto 36 duals has been running fine since I pulled it out of storage, got in it to run pick up a pizza the other day and it seemed to lack power, tonight I took the air filters off and turned on the fuel pump, holy crap the left front carb barrel started filling up with fuel! The rear barrel seemed fine, just the left front barrel??? Any ideas, I have pulled the carb and it looks okay, the only odd thin is the large spring under the brass nut is kind of gunked up. I'll go snap a pic.

These were purchased rebuilt from the guy in Italy, they ran fine all last year.

Posted by: 1bad914 May 7 2008, 06:29 PM

Pics of gunked up spring

Attached image(s)

Posted by: jr91472 May 7 2008, 07:40 PM

You probably have the Dellorto Drip. Go to the clinic and get a quick shot

Seriously, I had the same problem. Apparently it is fairly common on Dells. Basically there are plugs that are used to fill some passages in the carb used in manufacturing. These eventually begin leaking.

Google Art Theron (sp?). He is the man. Ship him your carb and you will be back in business. Didn't cost much as I recall. Do a search here as well.

good luck

Posted by: jr91472 May 7 2008, 07:50 PM

linky..

http://www.aircooledengineering.com/index.php

Posted by: type11969 May 8 2008, 07:29 AM

Check the seat for needle valve in the bowl, make sure no crud has built up on it. If the needle valve doesn't close, fuel will keep flowing into the bowl even once the float is at its highest position and will then dump into the barrel. Interesting it is just one barrel but maybe you were on an incline when you were checking. While you are at it, reset the float height as per the dell manual. A little tweak on the float stops may be all you need to shut the needle valve properly (if that is the problem).

That large spring is for a choke mechanism for an alfa, you aren't using it. My understanding is that as long as that spring is in there, it shuts off the choke circuit so you don't have to worry about it.

-Chris

Posted by: jr91472 May 8 2008, 09:26 AM

Since you already have the top off the carb, simply pour some gas in the bowl and see if it still leaks. If it doesn't leak, then check the needle valve as advised by Type 11969.

If the bowl won't hold fuel, then it is a leak.

Posted by: rhodyguy May 8 2008, 09:35 AM

i think your carbs need a deeper cleaning than just a soak in the generic cleaner avail in your local auto parts store. the work A.C.E. does is not cheap(not so bad as a set of new carbs). quality seldom is.

k

Posted by: 1bad914 May 11 2008, 08:15 PM

I rebuilt a set of 40 webers I had laying around and put them on, they seem to be working well so far. I'll rebuild the Dells and give them a try later. Thanks for the help!