Air/Fuel mixture screw question. - Page 2 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
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post #11 of 24 (permalink) Old 05-21-2020, 08:55 AM
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No, just use the prescribed amount of Seafoam. It's either 1 or 1.5oz per gallon of gas, in the tank. Sometimes it can be added straight to the carb through the fuel line, but that just cleans the bowl.

The coast enrichers are easily accessible if you want to peek inside. It's the circular cover facing out as you look at the side of the carb. Three screws I think.

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post #12 of 24 (permalink) Old 05-21-2020, 09:56 AM Thread Starter
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Originally Posted by Spockster View Post
No, just use the prescribed amount of Seafoam. It's either 1 or 1.5oz per gallon of gas, in the tank. Sometimes it can be added straight to the carb through the fuel line, but that just cleans the bowl.

The coast enrichers are easily accessible if you want to peek inside. It's the circular cover facing out as you look at the side of the carb. Three screws I think.
Is this what you’re referring to? If I take a peek how many tiny pieces pop out?
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post #13 of 24 (permalink) Old 05-21-2020, 09:59 AM
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Is this what you’re referring to? If I take a peek how many tiny pieces pop out?
That's it. Check the manual but I think it's just the diaphragm with piston attached, and a spring.

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post #14 of 24 (permalink) Old 05-21-2020, 11:08 AM Thread Starter
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Ok cool thanks, I found it, doesn't look too daunting. assuming it should be clean and gunk free in there.
It’s part “7” description is lower on the page
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post #15 of 24 (permalink) Old 05-21-2020, 11:22 AM
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Ok cool thanks, I found it, doesn't look too daunting. assuming it should be clean and gunk free in there.
It’s part “7” description is lower on the page
If you're in there, could give the passages a shot of carb cleaner.

Is this the bike that's missing one muffler? Could cause some popping.

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post #16 of 24 (permalink) Old 05-21-2020, 11:40 AM Thread Starter
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If you're in there, could give the passages a shot of carb cleaner.

Is this the bike that's missing one muffler? Could cause some popping.
I only have SeaFoam and Sta-bil at the moment but not the spray bottle, would need to get some carb cleaner, as far as mufflers, I have none on the bike, i still have them though, just wondering what's the consensus on JB-Weld being able to hold the clamps on the mufflers?? will the heat just break them again?

You can see it here, and if you look close enough you can see that this is a "Lulcan 750" , my "V" cracked on the side cover lol
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post #17 of 24 (permalink) Old 05-26-2020, 09:46 AM Thread Starter
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So I was reading previous posts on this and found this from Ubertalldude:

“Vacuum caps on the exhaust inlets is fine, so long as they seal tightly. They are effectively the same as coasters, but look a little different (I think they look cooler on a black engine)
The popping doesn't damage anything, but it's less than ideal as it puts extra stress and heat on the exhaust (which it can handle fine, albeit with the side effect of bluing) Did you also cap off the vacuum port on the right-side carb? That could lean you out and cause excessive popping.
As for reducing the popping, just adjust your right-side carb's idle air mix screw out (CCW) 1/4-1/2 turn at a time to see if it helps with the popping. Should work fine so long as your carbs are clean and in good working order.”

I did NOT plug the vacuum port on the right carb, where is that??

Here’s a short vid of how the bike sounds. Of course yesterday the popping wasn’t terrible but it’s still there. The vid is real shaky, but it caught the audio well.

https://youtu.be/mhnwhtWUYZU
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post #18 of 24 (permalink) Old 05-26-2020, 11:11 AM
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Originally Posted by mmart View Post
So I was reading previous posts on this and found this from Ubertalldude:

“Vacuum caps on the exhaust inlets is fine, so long as they seal tightly. They are effectively the same as coasters, but look a little different (I think they look cooler on a black engine)
The popping doesn't damage anything, but it's less than ideal as it puts extra stress and heat on the exhaust (which it can handle fine, albeit with the side effect of bluing) Did you also cap off the vacuum port on the right-side carb? That could lean you out and cause excessive popping.
As for reducing the popping, just adjust your right-side carb's idle air mix screw out (CCW) 1/4-1/2 turn at a time to see if it helps with the popping. Should work fine so long as your carbs are clean and in good working order.”

I did NOT plug the vacuum port on the right carb, where is that??

Here’s a short vid of how the bike sounds. Of course yesterday the popping wasn’t terrible but it’s still there. The vid is real shaky, but it caught the audio well.

https://youtu.be/mhnwhtWUYZU
Ok, tell me again, what's your exhaust setup?

The vac port on the right carb is on the side of the carb facing straight out. Had the vac hose for the suction valve on it.

As a little hooligan trick, at the top of the mountain I reach down and pull the cap off the right side vac port, then do a long decel down the mountain. It goes off like a cannon. I don't do it anymore, since I don't want to buy new mufflers.

Open exhaust, lean air adjustment, and a vacuum leak can all contribute to popping.

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post #19 of 24 (permalink) Old 05-26-2020, 11:58 AM Thread Starter
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I have stock intake and no mufflers, I'm using 6 inch exhaust tips

Here is a pic of the right side of the carb, is that single line clamped on a vacuum line? I didn't touch that line when I pulled the tank off last week. I just disconnected the lines right off the petcock, this way I had them just sitting there lined up in order they needed to be reconnected.

If that's it, what do you guys use to plug it?
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post #20 of 24 (permalink) Old 05-26-2020, 12:23 PM
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Quote:
Originally Posted by mmart View Post
I have stock intake and no mufflers, I'm using 6 inch exhaust tips

Here is a pic of the right side of the carb, is that single line clamped on a vacuum line? I didn't touch that line when I pulled the tank off last week. I just disconnected the lines right off the petcock, this way I had them just sitting there lined up in order they needed to be reconnected.

If that's it, what do you guys use to plug it?
Yes that's it.

You can cut a short piece of that hose, stick a bolt in one end, then put it on the carb.

Or find a vacuum cap.

Are you coastered? If so, the other end of the hose may be open if you removed the suction valve. Open vac port will make it pop, sometimes like a cannon.

Those pipes may always pop. But get the vac leak stopped, then try a richer air adjustment, if you're still wanting to reduce popping.

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__________________________________________________ ____________
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Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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