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Post by aceonf4i on Aug 30, 2012 8:28:28 GMT -6
Does anyone remember seeing a thread on how to bench sync our 454 carbs? Or can send me the info on the best way to sync the carbs with them off the bike?
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Post by Jet⚡Black on Aug 30, 2012 10:23:17 GMT -6
Bench synchronizing is a pretty simple task, and free compared to a diy manometer. If you look in the air filter side of the carbs you will see a little hole at the bottom of both carbs, you may have to actuate the throttle arm to move the valve to see them. These are going to be your guide marks.  Notice that there is a small screw in the middle of the carbs on the top, actuate the arm so you can see how the screw links the two carbs when you move the arm. This is your adjustment screw to sync the carbs. Unscrewing makes the left valve move back, tightening moves the left valve forward.  To actuate the throttle...  Ok, looking at the right side carb, find the guide hole, actuate the arm until the valve is right at the very back edge of the guide hole.  Now hold the right valve there using the actuator arm and turn the adjustment screw, loosening moves the left valve back, tightening it moves the left valve forward. Turn the adjustment until the left valve is at the back edge just like it is on the right. Actuate the arm and look at the valves making sure they cover and uncover the guide hole at the same amount. Done. |
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Post by aceonf4i on Aug 30, 2012 10:34:40 GMT -6
Sounds and looks simple, I watched a video online where the guy used a small needle and the idle adjuster he opened the adjuster to where the needle fit under the valve, then matched the other one to the small needle. But i like this method better, going to give it a shot this weekend. Thanks again
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Post by Jet⚡Black on Aug 30, 2012 10:47:21 GMT -6
No worries man, the problem with the needle business is that the spring is so strong it will indent a needle impression on the valve, and those little holes will match up with that tiny indent, when you want the valve to be completely closed for a perfect vacuum. Until the throttle opens, the indent creates a tiny air leak...and the more you keep having to close on the needle the more indents, it kinda defeats the purpose.
A thin strip of paper if you have trouble seeing the hole wont scar up the valve, I like methods that don't require 3 arms.
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Post by BenInPA on Apr 6, 2013 22:22:57 GMT -6
Hey jet, this method that you described is bench syncing correct? Is this the same as the manometer sync? Does this accomplish the same sync as vacuum syncing? I am pulling my carbs tomorrow and want to make sure they are synced.
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Post by Blaine on Apr 6, 2013 23:26:26 GMT -6
The bench snyc will be close although not as accurate a done with a manometer.
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Post by kawa85 on Mar 22, 2014 18:36:55 GMT -6
Do both syncs need to be done? That's what I have learned online.
Sent from mobile using proboards app
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Post by Blaine on Mar 22, 2014 18:50:42 GMT -6
Do both syncs need to be done? That's what I have learned online. Sent from mobile using proboards app  ? The one adjustment screw syncs both carbs.   |
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Post by kawa85 on Jun 14, 2014 16:37:09 GMT -6
What I meant to say was do you have to do both a bench sync and a vacuum sync? As for the adjuster screw that sits between the carbs, is this the screw you turn/adjust when doing a vacuum sync?
Sent from mobile using proboards app
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Post by Blaine on Jun 14, 2014 21:21:42 GMT -6
What I meant to say was do you have to do both a bench sync and a vacuum sync? As for the adjuster screw that sits between the carbs, is this the screw you turn/adjust when doing a vacuum sync? Sent from mobile using proboards app No you can do a vacuum sync.Yes that is the screw. |
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? The one adjustment screw syncs both carbs. 