Great, My Turn for the Carbs - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 7 (permalink) Old 07-08-2016, 02:15 PM Thread Starter
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Great, My Turn for the Carbs

Ran fine 2 weeks, today one pilot jet seems to be clogged. Question is, which one? Runs strong above 4000 rpm. Idles on one cylinder.

What a pain in the kielbasa keeping the idle up, flipping the choke in traffic. I gave up and came home early. The choke does get the dead cyl. firing. Won't idle without the choke, power is flat then comes on in a big burst.

So.. Seafoam? Been using it regularly, about 3 times per year.

Blowback?

Teardown?

Going to let it cool down and try blipping the throttle on each carb to pinpoint the slacker.

Never been into the carbs, might be time to have a look, but I kinda dread the r&r.

Just put on a factory new tank and rebuilt the petcock last month.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #2 of 7 (permalink) Old 07-08-2016, 02:59 PM
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Never touched my Carbs either!!(Fingers crossed!!)
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post #3 of 7 (permalink) Old 07-08-2016, 03:15 PM Thread Starter
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Originally Posted by vulkan View Post
Never touched my Carbs either!!(Fingers crossed!!)
None can escape! Thought I was immune too, made it three years.

I'm not patient enough to try a tank of seafoam, that would have to be a lot of low speed running.. yuck!

Gonna have to pull'em off I think. Carb linkage is tied together so blipping is out of the question. Have to take both carbs anyway.

Idles about 500 without the choke, 1100 with full choke and hot.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #4 of 7 (permalink) Old 07-10-2016, 12:00 AM
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Drain bowl on each and measure/compare amounts? Then do blowback?

I know you know way more, but these carbs are honestly simple to tear down, inspect and reassemble. reinstalling is more work than checking pilots themselves but if ear shaved it's just minutes after the first time.

When I swapped and tested new jets I pulled multiple times in same setting cause it was much easier/faster than doing the jet swap while installed.

Last edited by gidaeon; 07-10-2016 at 12:04 AM.
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post #5 of 7 (permalink) Old 08-09-2016, 11:50 PM Thread Starter
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Can't believe I waited a month to do this. Also can't imagine doing it without an earshave, it was fussy enough going back in.

Did it quick and dirty... Left all the cables connected and just pulled the jets out with the carbs hanging there. Need a 7mm wrench to get one screw out, throttle cables prevent using a screwdriver.

Turns out I do have stock jets, 132/32.

Rear carb was dirty with a clogged pilot jet and some of the emulsion holes were clogged on the main. Had dirt in the drain well on the jet cover too. so I'm glad I didn't blowback. The dirt in the jet was that grainy crap that comes from gas evaporating, took a bit of work to get the pilot cleared. The pilot has larger holes on both ends but the center of the jet is smaller than anything I could push through there. Finally got it soaked and blown out.

Could still smell seafoam in my gas, just none of it was flowing through that jet.

Front carb was spotless, drain plug well and all. I don't get it. (cleaned it anyway)

Runs great now! Had to turn the idle down. Been hot as hell for about 10 days, but was nice riding this evening. Hoping to get a read on mpg with the petcock and carbs done now.

Install: Push rear carb with boot on it, onto the rear head first, then push front carb into the boot on the front head. Front boot stays on the front head.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #6 of 7 (permalink) Old 08-10-2016, 04:10 PM
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Great feeling isn't it!

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post #7 of 7 (permalink) Old 08-10-2016, 04:47 PM Thread Starter
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Originally Posted by Goofyfoot2001 View Post
Great feeling isn't it!
Yes it is! Kickin' myself for sitting out the month of July.

Waiting for dark so I can ride some, heat index at 100 right now.

For some reason, gas tends to evaporate from the rear carb quicker than the front. Reason for the one cyl not firing right away on startup after some storage. Sitting on the sidestand might promote that.

I loosened the drain screws, which were way too tight. Keeping that allen wrench handy to drain the carbs more often. Might put some permanent drain hoses on there.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

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