 New carbs- one barrel pulling in too much air |
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| McMark |
 Jul 2 2013, 12:59 PM
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#21
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914 Freak!  Group: Retired Admin Posts: 20,180 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None  |
You can't really see if the throttle plates are closing with the carbs on the engine. You need a light on one end and your eyeball on the other.
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| stugray |
Jul 2 2013, 01:05 PM
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#22
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE back off the throttle shaft screws and realign them you need to be very careful loosening those screws. They are very hard to get loose (if still factory). It is too easy to apply too much pressure and bend the shaft. You can back-up the shaft to keep it from bending but then you need to remove the venturis so you can get a block of wood or something in there. Stu |
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| rhodyguy |
Jul 3 2013, 08:11 AM
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#23
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,252 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
for heavens sake. how in the hell, with all 4 by-pass screws closed, do you bring the lowest ones up? backing the screws OUT routes the air flow around, BY-PASSING, the throttle plates and reducing the flow thru the venturi. YOU'VE got it backwards. you back the HIGHEST flowing carb bore(s) screws OUT to match the lowest flowing. again, not to exceed the maximum # of turns recommended. go to far and you lean that cyl(s) out.
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| McMark |
Jul 3 2013, 11:32 AM
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#24
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914 Freak! Group: Retired Admin Posts: 20,180 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Sorry you're the one that's backwards. All air coming into the engine flows through the ventri, so no matter if the throttle plate is opening, or the air-bypass screw is backing out, that air is flowing through the snail and reading higher.
QUOTE BY-PASSING, the throttle plates and reducing the flow thru the venturi. NOPE! It's does bypass the throttle plate, but it's still flowing through the venturi. Air entering the 'bypass chamber' comes from the main airflow. There isn't a separate air inlet for the bypass. With regards to airflow, backing out the bypass screw is essentially the same as opening the throttle plate.Attached image(s) 
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| Jake Raby |
Jul 3 2013, 01:42 PM
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#25
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Engine Surgeon Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
This was a common issue with the "Genuine" Webers in 2008 when I stopped using them. The throttle shafts were twisted right out of the factory among other issues.
Too many people buy the name expecting them to be the way they always were before. Not the case. |
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| tornik550 |
Jul 3 2013, 01:49 PM
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#26
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
I found a way to fix my problem. Return the carbs and go back to my old system!!!!
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| tornik550 |
Jul 4 2013, 06:43 PM
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#27
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
UPDATE-
The issue appears to be that the throttle shaft on on carb is slightly bent. Also- I found that the secondary venturi's were installed upside down from the factory!!!! WTF!!! I had just taken them out of the boxes when I noticed that they were opposite to my other weber 44 idf's. I thought that my old ones were messed up. It turns out that the new webers are. How could they make such a stupid mistake. |
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| McMark |
Jul 4 2013, 11:56 PM
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#28
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914 Freak! Group: Retired Admin Posts: 20,180 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
They realized that because of their name reputation they can make just as much money without paying attention to little things like 'being correct'.
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