The rear cylinder only runs with the choke on. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 9 (permalink) Old 06-14-2010, 09:08 PM Thread Starter
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The rear cylinder only runs with the choke on.

Got a problem.

I pulled the carbs, disassembled them, cleaned them with boiling lemon juice, and berrymans carb cleaner.

I noticed that the pilot jet in one of the carbs had been sheared where the flat blade would screw it out. It was split in a couple places but still open. I left it in there and hoped for the best.

I also noticed that the float on one of the carbs seemed to have more free-play and less resistance than the other float.

However, the "U-pins" that hold the floats in the float bowls were stuck beyond my frustration thresh-hold. So I left them in there and hoped for the best as well.

Before I pulled the carbs, the rear cylinder would only run on full choke and some throttle. After cleaning the carbs the rear cylinder still only runs on full choke and some throttle.

This is an '86 VN750A2. It has straight pipes with eyelets added for a little back-pressure. I am running the stock air filter boxes with K&N filters. I am also running a AGM sealed battery. The EPA stuff is pulled with the appropriate air intakes and vacuum lines plugged.

Somebody please give me some advice... I know I should have replaced the pilot jet and bulldogged the float bowl pins. I suppose I need someone that knows more than me to say so and throw in any additional ideas.

Thank you for your help!!
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post #2 of 9 (permalink) Old 06-14-2010, 09:30 PM
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Sounds like you want to pull those carbs again! The float pins are a PITA, but you can pull them off with needle-nose pliers - pull straight up, and those pins will come free. Also, the floats should have significant free play - just bobbing up and down with the fliick of a finger. If you've got one showing some resistance, pull the whole thing and make sure the needle is ok, too. Finally, replace that pilot jet - might be open, but might also be too open. I have some spares sitting around, so if you want a workable replacement, shoot me a pm.

Otherwise, double-check that you've got all the jets free of muck and debris. For really dirty carbs, I've taken to soaking them in a bucket of carb cleaner, rinsing them with water, and drying them with compressed air. Yours might need another bath.

C

Last edited by Crobins365; 06-14-2010 at 09:33 PM.
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post #3 of 9 (permalink) Old 06-15-2010, 12:24 AM
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Rear pilot jet is clogged, it may not be the jet itself but the labyrinth in the carb. Like Cindy I have an excess of stock mains and pilots, around 40 or so, completely free just need an address.

Berrymans carb cleaner is in my opinion CRAP, I use Gunk carb parts cleaner dip to remove most grime than into the ultrasound tank. 12 hrs. per carb in carb dip, rinse and blow ALL ports with compressed air, if Ultrasound is not an option.


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Last edited by lance328; 06-15-2010 at 01:42 AM.
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post #4 of 9 (permalink) Old 06-15-2010, 01:01 AM
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I second the motion for Berrymans from this point forward to be referred to as 'Crap'. IMO, you might as well use acetone.

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post #5 of 9 (permalink) Old 06-15-2010, 04:47 PM Thread Starter
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Thank you everyone for the replies!

Okay... I will pull the carbs again... I will replace the pilot jet... I will COMPLETELY disassemble the float assembly... I will take up an offer of a buddy to use his ultrasonic carb cleaner and compressed air... and I will go ahead and rejet the carbs per Lances suggestion.

You would think a guy would get frustrated to have to pull the carbs again, but I kinda feel like a little kid playing with his favorite toys
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post #6 of 9 (permalink) Old 06-15-2010, 04:50 PM Thread Starter
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And thank you for Cindy and Lances generosity!

People like that is what makes this all alot more enjoyable!
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post #7 of 9 (permalink) Old 06-15-2010, 10:40 PM Thread Starter
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Wow.

Okay, It was ALOT easier to pull the carbs the second time.

Got the float "U-Pin's" pulled per Cindy's suggestion. Noticed what seems to be a superglue like substance preventing the inner pin on the float needle assembly from moving in and out on the rear float. This is what I think has been preventing a smoother travel for that float.

Now prepare for the crap to hit the fan.

The damaged and stubborn pilot jet I have been trying to get out has now broke off at the base of the thread. So I went to the auto parts store to pick up a back-up tool.

Then after I drilled out a slightly larger pilot hole; I lined up the back-up bit... tapped it lightly with a small hammer; then attempted to back it out.

Now the back-up bit has broken off in the pilot jet...

I think I'll go kick the dog now.

Could really use some ideas... I am at a loss...

Thank you in advance!!
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post #8 of 9 (permalink) Old 06-15-2010, 10:45 PM
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see if someone here has a used carb or check ebay the hardened "easy-out" is really tough to drill.


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post #9 of 9 (permalink) Old 06-16-2010, 06:50 PM
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I have several carb sets as well as a cadaver carb. Shoot me a pm - we should be able to get you running again.

C
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