Needs full choke to run - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 12 (permalink) Old 07-02-2018, 11:41 AM Thread Starter
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Needs full choke to run

I just got my first bike. A 1987 VN750 with 16k miles. I have been learning my way around it and taking it out for a few rides. I have a issue though, the bike needs full choke to run. Anything other than full choke it will die. I have drained both carbs, Tapped them to try and release a float, and run a tank of seafoam through it but it didn't make a difference. Any ideas what could be the issue?

Other than that minor annoyance the bike is great, the air suspension is super comfortable and the auto cancelling directionals still work!

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Jon
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post #2 of 12 (permalink) Old 07-02-2018, 12:07 PM
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Dirty carbs.

If gas can't flow, neither can seafoam.

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post #3 of 12 (permalink) Old 07-02-2018, 01:05 PM
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Yep, clogged jets. If you open it up to about 2/3 throttle and turn the choke off does it keep running? Does it just not idle? Both point to clogged pilot jets.

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post #4 of 12 (permalink) Old 07-02-2018, 01:05 PM
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Yep, clogged jets. If you open it up to about 2/3 throttle and turn the choke off does it keep running? Does it just not idle? Both point to clogged pilot jets.

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post #5 of 12 (permalink) Old 07-02-2018, 01:14 PM
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post #6 of 12 (permalink) Old 07-02-2018, 01:27 PM Thread Starter
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It wont idle, I can ride it with the choke off but it will die when I stop at junctions. What is the easiest way to clean the jets?
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post #7 of 12 (permalink) Old 07-02-2018, 01:46 PM
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Quote:
Originally Posted by JHolden View Post
It wont idle, I can ride it with the choke off but it will die when I stop at junctions. What is the easiest way to clean the jets?
Pilots clogged solid, probably.

Cleaning the jets can be done on the bike, if you're good and have the right tools. But to really clean the rest of the passages in the carb body, the carbs have to come off.

Mine is earshaved, and I left the throttle cables connected when I cleaned the carbs. I didn't soak the bodies, just blew cleaner and air through all the holes to make sure they're open. (towels covering everything)

Your jets will need to soak a while to loosen the concrete. I've sprayed carb cleaner into a cup, but last time I used Castrol Super Clean for the soak. ... and since then I got an ultrasonic cleaner! It works, favorite to use in it ... distilled white vinegar.

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post #8 of 12 (permalink) Old 07-02-2018, 01:50 PM Thread Starter
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I would like to try and do it on the bike, just to see if I can improve things for the summer, and save a complete clean for the winter. Does anyone have a procedure or a few pictures?
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post #9 of 12 (permalink) Old 07-02-2018, 02:19 PM
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you could also try soaking the carbs in Seafoam or Berryman's B12 (cheaper, more powerful, slightly riskier than Seafoam) in-place by draining the fuel out of the bowls via the drains on the bottom (small hex-cap/allen key screws on each carb) and filling the carbs with cleaner through the fuel lines. Seafoam let sit for a couple days, B12 leave for a few hours or overnight, then drain, reconnect the fuel, and see if it'll fire.

Neither are guaranteed, but it might just get you riding OK until you can take the time to pull the carbs.

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post #10 of 12 (permalink) Old 07-05-2018, 10:36 AM
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Your pilot jets are clogged. Not sure if anyone has suggested that or not...

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