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Title: Need an idea on jetting 40 Dellorto? Post by: Frenchy Dehoux on October 24, 2013, 00:43:10 am I have a 1776 cc with dual Dellorto ( 40 ) and need to have an idea where to start with the idle jets ,mains and air jets. I do not know what the customer has for a cam. Thanks Frenchy Title: Re: Need an idea on jetting 40 Dellorto? Post by: Bruce on October 24, 2013, 02:05:14 am What CB supplied is pretty close.
34mm vents 140 main 60 idle 9164.2 tubes 180 air correction jet Now here's the strange part. For 36s, 45s and 48 DRLAs, CB supplied a 50 pump nozzle. But in the 40s, they came with a 35. I never could figure that out. I have the 35s in my 40 DRLAs. Since you are a bit higher than sea level, I bet a 135 main and a 57 idle will work for you. Make sure you use a single vacuum adv distributor for better mileage. Get the one from aircooled.net that's had the mechanical curve modified. Title: Re: Need an idea on jetting 40 Dellorto? Post by: nicolas on October 24, 2013, 05:56:59 am What CB supplied is pretty close. 34mm vents 140 main 60 idle 9164.2 tubes 180 air correction jet Now here's the strange part. For 36s, 45s and 48 DRLAs, CB supplied a 50 pump nozzle. But in the 40s, they came with a 35. I never could figure that out. I have the 35s in my 40 DRLAs. Since you are a bit higher than sea level, I bet a 135 main and a 57 idle will work for you. Make sure you use a single vacuum adv distributor for better mileage. Get the one from aircooled.net that's had the mechanical curve modified. i used that as well, but i went with a 55 idle. still smooth, but it is Belgium, not Arizona. |