does my carbs needs to be tuned? - Page 2 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

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post #11 of 42 (permalink) Old 10-18-2017, 02:43 PM
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The coasters purpose is to stop the deceleration issues. They can be leaking so inspect better than just a quick visual glance. Missing an issue will cause a big headache you can avoid.


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post #12 of 42 (permalink) Old 10-18-2017, 03:13 PM Thread Starter
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alright i will take them apart and check them better, they supposed to be blocked right, because mines are, and it shouldn't be sucking air correct.
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post #13 of 42 (permalink) Old 10-18-2017, 04:10 PM
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How to get rid of the Pops and Backfires
Jun 28 2011, 7:50 PM EDT
Is your VN750 popping or backfiring? You already adjusted the air fuel mixture screws several times, checked for exhaust leaks, but still can't get the popping to go away? you might try Marbeling or installing coasters.

We will talk about Marbeling first.
Marbeling is just as it sounds. You will block off the Air Valve Switch located under the gas tank, just in front of the battery box (16126 on microfiche http://www.ronayers.com/Fiche/TypeID...ilter%281_2%29) . You will need to "Shooter" marbles (or anything that will fit into the hoses to block the air flow.
What to do:
Remove the hoses on the two reed valves
install marbles into the hoses
reattatch the hoses

Now we will talk about Coastering
Coastering does the same thing as Marbeling, but is a lot more permanent and adds a cleaner look.
What you will need:
Coasters (you can find them on eBay or build your own)
Reed valve Gaskets (qty 2)

what you do:

remove the coasters, and the whole air valve switch to include hoses
Cap off the vacuum line on the right carb
remove the stock reed valves
install coaster plate where the reed valves were
go ride..

How to get rid of the Pops and Backfires - The Kawasaki Vulcan VN750 Bible


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post #14 of 42 (permalink) Old 10-18-2017, 05:24 PM
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post #15 of 42 (permalink) Old 10-18-2017, 06:21 PM Thread Starter
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my reed valves are block already, i will check for air leak on them, and the other part mention ont he picture, i will need to put the carbs out again to check those, whats the bad thing of running the engine backfiring when dec?
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post #16 of 42 (permalink) Old 10-18-2017, 10:51 PM Thread Starter
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coaster are not leaking, and bike run horrible now after the seafoam and 2, 2.5, 3, 3.5 or 4 turn screw just will idle but if you accelerate it it will bog and shut off, i take carbs out, jets are clean and good, but the tuning screw from the front cylinder is missing the little spring inside, will this affect or create my issue? now where can i get one?
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post #17 of 42 (permalink) Old 10-19-2017, 01:26 AM Thread Starter
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well i just found out that one pilot screw is missing the spring washer and the rubber, and the other one is missing the washer and rubber, i already order them OEM Kawasaki, they arrived on monday, i also check the coasting enricher and the back cylinder looks like peeling inside but not holes, and the front one (the one with issues) is missing a little rubber between the cap and the base like a vacuum seal, i created one with a piece of rubber and patience (a lot), i will be waiting on monday for the kit to arrive and install everything back let see if i dont have to burn down that bike lol
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post #18 of 42 (permalink) Old 10-22-2017, 09:40 PM Thread Starter
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parts arrived, install them all already, time to start the bike, to much way to much fuel, even with the jets close carbs are getting floored, gas are coming out from exhaust, carbs breather lines even through the intake pods, what i did wrong? some inputs here?
quick note i vacuum the petcock myself before turn in on the bike just to have the carb with fuel! maybe to much? will open the gas cap and see
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post #19 of 42 (permalink) Old 10-22-2017, 09:56 PM
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Sounds like a stuck float, or float height set too high.

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post #20 of 42 (permalink) Old 10-23-2017, 12:14 AM Thread Starter
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issue fix, took the carbs out again the needle from the incoming fuel was stuck open. with all the parts on the carbs new bike rides a bit smooth. but still back firing on front cylinder when dec, way less now but still does,
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