Carb syncing question Options

[Cevan]

I'm trying to sync the carbs (Weber IDFs) on my new engine. I warmed it up and then let it idle at about 800 rpms. I disconnected the linkage and used the synchometer. On one carb, both barrels were very close to each other (5 and almost 5), while the other carb read a 5 and a 3. Is this indicative of a bent shaft or some other problem, or can this be adjusted?

I do recall removing the throttle plates from one of the carbs while I was cleaning them. I was going to remove the shaft but decided against it and put the plates back on. Might I have changed the position of one or both of the throttle plates in relation to the bore? Would this cause the problem?

Also, fuel seems to be almost weeping in the area of the brass bolt and washer (#5 and 6 in the picture) directly under where the feed line connects to the carb. I used a new washer and tightened the bolt real good. Any ideas?

[70_914]

I'm trying to sync the carbs (Weber IDFs) on my new engine. I warmed it up and then let it idle at about 800 rpms. I disconnected the linkage and used the synchometer. On one carb, both barrels were very close to each other (5 and almost 5), while the other carb read a 5 and a 3. Is this indicative of a bent shaft or some other problem, or can this be adjusted?

I do recall removing the throttle plates from one of the carbs while I was cleaning them. I was going to remove the shaft but decided against it and put the plates back on. Might I have changed the position of one or both of the throttle plates in relation to the bore? Would this cause the problem?

Also, fuel seems to be almost weeping in the area of the brass bolt and washer (#5 and 6 in the picture) directly under where the feed line connects to the carb. I used a new washer and tightened the bolt real good. Any ideas?

1. There should be an adjustment screw for each venturi that you turn to get the #'s equal, looks like #41 is it. My carbs are Dellortos so I am not sure on the Webbers...

2. Get a new copper sealing washer and heat it with a torch, let it air cool and then put it on.

[cgnj]

Hi,

Fully seat air bypass screws. Use bypass screws to balance throats one carb. No worries about the number as long as they are the same. Do the same to the other carb. Now use idles screw to make left and right even. Spend the next 3 days noodling with linkage. You're done.

Except for the fuel leak.

Carlos

[r_towle]

Hi,

Fully seat air bypass screws. Use bypass screws to balance throats one carb. No worries about the number as long as they are the same. Do the same to the other carb. Now use idles screw to make left and right even. Spend the next 3 days noodling with linkage. You're done.

Except for the fuel leak.

Carlos

(IMG:style_emoticons/default/agree.gif)

You can also flip the carbs from side to side to see if the problem follows the carb or stays at the cylinder in question.

If it follows the carb, you need to reset the carb using the air bypass screws first to get both barrels to match.

Rich