what should i do? what should i do? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
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post #1 of 29 (permalink) Old 04-22-2007, 02:02 PM Thread Starter
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what should i do? what should i do?

hi,
need fix my hestitation problem when the engine is under load. first off, i have gas in the tank and have given my carbs the 24 hour seafoam enema.
but the hestitation continued. so today while riding i switched to the reserve tank just for laughs ( first time since i owned the bike) and WOW, no hestitation and the bike just about jumps thru its skin.
so now to my vulcan brothers & sisters, what is causing my problem with my primary feed line to the carbs &how do i fix it?

thanks & ride m safe, J
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post #2 of 29 (permalink) Old 04-22-2007, 03:41 PM
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You may have a dirty screen on the primary line or a plug in the valve.

Chad Falstad "Hawk"
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post #3 of 29 (permalink) Old 04-22-2007, 04:30 PM
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Quote:
Originally Posted by Ccspinner View Post
You may have a dirty screen on the primary line or a plug in the valve.

I second the dirty screen

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post #4 of 29 (permalink) Old 04-23-2007, 03:12 PM
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I'd take the petcock off and open her up. You might find the problem easily. But it will give you a chance to clean things up. Might be time to rebuild the petcock too.

Fergy
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post #5 of 29 (permalink) Old 04-23-2007, 10:15 PM
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This may be silly, but I thought I was turning my petcock off for a long while when actually, I was putting it in reserve. On the arm of the petcock is an arrow pointing to the position it should be in. I say this because I have heard others say there is some 'lag' time to refill the reserve portion of the tank (??). If that is true, if the valve is really in the reserve position, wouldn't that cause slight hesitation? Is there any way fuel lines could be reversed?

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post #6 of 29 (permalink) Old 04-24-2007, 09:56 AM
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Not knowing much about our petcock, does it have two fuel lines? If it's like the other KAW petcocks I've been around, they have one vacuum port and one fuel port. I'd think our fuel port attaches to a fuel line that T's into both carbs, but maybe I'm wrong. The valve of the petcock should have two openings that when the handle is turned it aligns the opening from either the main "ON" position tube to the fuel port, or the reserve "RES" tube position to the fuel port. The "OFF" position would close off both tube ports.

Both tube ports when routed to the fuel port on the petcock flows through an opening that is controlled by a spring loaded valve that when vacuum is applied to the vacuum port, it pulls open the spring loaded valve, opening the path to the fuel line going from the petcock to the carbs. This is why the petcock should not flow fuel when the bike is not running (no vacuum).

Someone correct me if I'm wrong about there being one fuel port and one vacuum port...


I believe on earlier models, the petcock has a prime position that flows fuel without need for vacuum.

EDIT: Looks like I was wrong about one fuel port. I found some photos where someone had two fuel filters on their bike, one on each side, so I guess it has two. Sorry!

Fergy
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Last edited by fergy; 04-24-2007 at 10:01 AM.
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post #7 of 29 (permalink) Old 04-24-2007, 10:13 AM
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The two fuel lines are probably feeding off the same port. The two lines you are seeing if where the fuel T's off from the petcock to the two carbs.

As far as the reserve goes it is pulling from the same place as the ON position.

The on position is like drinking out of cup with a straw that is too short. You can drink fine when it is full but eventually there is still drink in the cup that you can't reach. The reserve would be like grabbing a longer straw that reaches that last little bit of drink so you don't go thirsty before you get to the store.

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post #8 of 29 (permalink) Old 04-24-2007, 10:14 AM
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Just about to respond - one vacuum port, two fuel ports. But when you guys are talking about a dirty screen, that's a screen on the petcock to one of the fuel lines? Haven't pulled apart a petcock yet (there's still time!!!), so just wondering where the build-up would be.

C
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post #9 of 29 (permalink) Old 04-24-2007, 10:21 AM
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Actually, believe it or not I think I might have a spare one. I'll check at lunch while I'm home and grab it if I do. Maybe I can pull it apart and take some pictures. Then maybe I can put it back together.

Fergy
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Spline Lube Procedure, with photos, R/R Relocation and Coil Mod
Rusty Tank Cleaning!
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post #10 of 29 (permalink) Old 04-24-2007, 11:10 AM
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Quote:
Originally Posted by fergy View Post
Actually, believe it or not I think I might have a spare one. I'll check at lunch while I'm home and grab it if I do. Maybe I can pull it apart and take some pictures. Then maybe I can put it back together.
Now don't go getting my hopes up, Fergy! I'll probably pull the one on O. when I go to paint her. But pics in advance will no doubt lessen my pain.

C
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