Just got a pair of NOS Dellorto DRLA 40's.
These carbs do not have the air bleed screws for synchronizing. The ports are there, but they do not look like they were drilled or tapped for the air bleed screws.
The date stamp on the bottom of these carbs show 7/93.
I inserted a small hose in the port and could not blow any air through. I'm convinced they were never drilled.
I tried to get a photo inside the barrels to show that port is not drilled through, but
couldn't get a clear view.
Did all DRLA's have the air bleed screws, or were they just on early models?
Hmm mine have the by-pass screws right next to the idle mixture screws on both pairs I have.
.........SHOW a side VIEW of the carburator(s) where the adjusters are supposed to be..............So we can help you......M.M.
bump
photo added
..........Thanks for the photo, it helps.....I have never seen this before eighter.The bypass air screws are just not there.....Well maybe this IS an update from the factory.....Do take note however .....most of the installation and tune up instructions, adjustments, I have read, WANT the Idle bypass screws --SCREWED IN ALL THE WAY.....This effectively disables the AIR BYPASS SYSTEM anyway.(rendering that part of the system useless anyway)....With the proper venturis, air correction and main jets the carbs will run just fine.........M.M.
yes, Dells are THAT good.
Congrads on scoring the brand new Dells. I was a die hard Weber guy and hated Dells until I was told and convinced that Dells were better. I got a pair even though I had a pair of 44 Webers and found out that they are indeed better especially in the progression circuit.
In your pic the ports you have circled aren't the air by-pass. They are the ones right next to it. You usually don't need them and just leave them closed.
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