 Dual 40 IDF jetting |
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| cause |
 Dec 7 2021, 03:38 PM
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#1
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Newbie  Group: Members Posts: 33 Joined: 6-May 21 From: new york Member No.: 25,514 Region Association: None  |
I always hate in the motorcycle community when people ask "What jet do I need" yet here I am...
I just want to see if this is still a good starting point/base jetting a '75 2.0. Because venturis and jets are so expensive I would love to get a better idea before purchasing  |
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| 930cabman |
Dec 7 2021, 06:09 PM
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#2
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Advanced Member Group: Members Posts: 3,062 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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| NARP74 |
Dec 8 2021, 09:57 AM
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#3
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Senior Member Group: Members Posts: 1,064 Joined: 29-July 20 From: Colorado, USA, Earth Member No.: 24,549 Region Association: Rocky Mountains |
Got an accidental carb rebuild just a few months ago, long story. Not what I brought it in for but all's well that ends well. My Weber 40s are the very old style and I am at around 6000 ft. Here is what I have now, YMMV.
AC 2.10 ET F-11 MJ 1.15 PJ .50 IJ .55 Venturi 28mm Good luck |
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| Ansbacher |
Dec 8 2021, 01:02 PM
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#4
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Senior Member Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589 |
Your main venturi at 32mm is on the border of being too large. If you get poor adjustment response from your idle jets, you might want to back down to 30mm or 28mm. Also don't starve things going too lean with your pump jet size and squirt volume or you will have lousy performance off the line.
Ansbacher |
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| Mark Henry |
Dec 8 2021, 02:44 PM
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#5
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
(IMG:style_emoticons/default/agree.gif), I wouldn't put bigger then the 28mm vents in a 2.0, unless it had a big carb cam and matching valve train, etc.
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| cause |
Dec 9 2021, 03:13 PM
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#6
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Newbie Group: Members Posts: 33 Joined: 6-May 21 From: new york Member No.: 25,514 Region Association: None |
thanks for the info all! I'll report back with my findings
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| cause |
Dec 13 2021, 06:11 PM
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#7
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Newbie Group: Members Posts: 33 Joined: 6-May 21 From: new york Member No.: 25,514 Region Association: None |
Went with the settings in the picture. Finally took it for a cruise yesterday—still running rich—removed the air filters to see if that was enough to dial it in, but no luck. Going to drop the main jet a little more I suppose.
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| 930cabman |
Dec 14 2021, 12:32 PM
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#8
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Advanced Member Group: Members Posts: 3,062 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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Are you working with a Colortune? of an AFR? or?
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