Identifying hose and it's use - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 04-01-2008, 12:18 PM Thread Starter
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Identifying hose and it's use

I have a hose that needs replacing but I'm wanting to know what its purpose is? I have two photos below that show the hose where it goes on the carb and then where the other end goes.


THIS IS WHERE THE HOSE IS ON THE CARB


THIS IS WHERE THE OTHER END OF THE HOSE GOES (small hose on the right side of pic)


What is a hose from the carb doing attaching to an item where the water lines are also being attached?

just trying to understand.
thanks for all your help and info
Steve

Last edited by p10select; 04-01-2008 at 12:23 PM.
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post #2 of 11 (permalink) Old 04-01-2008, 01:47 PM
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Those are not water lines. They are air line that go to the side of the heads. One on the right side front cylinder, the other on the left rear cylinder. That is part of the emission control system. That small hose opens and closes that valve accordingly.

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post #3 of 11 (permalink) Old 04-01-2008, 03:12 PM Thread Starter
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So I am correct in assuming that the hose is suppose to go to that valve? I just was doing some testing if you will and in replacing the hose I just hooked it up to the carb first and left it off the valve. I started the bike and warmed to idle w/o choke. I then covered the end of the hose with my thumb and the idle increased and it seemed to run better. I put a screw in the end of the hose and took it around the block with no backfiring out of the pipes as it was doing. Before covering the hose it seemed to idle rough and acted like it was going to die. When I connect it to the valve it acts like it does without being closed off. Is this normal? Could something else be the cause?
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post #4 of 11 (permalink) Old 04-01-2008, 03:44 PM
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Your seeing for youself the affects of coastering. I'm not going to write up the whole thing as it's been done alot. Look into the vulcan verses to find a write up or even search through the site. Here is a link from the verses. Alot of us have done this & it's fairly easy to do! https://www.vn750.com/forum/showthrea...hlight=coaster
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post #5 of 11 (permalink) Old 04-01-2008, 04:47 PM
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I removed the reed valves and replaced them with the sanco coasters. I left the hoses on. Do I need to plug the vacuum line going to the rear carb?

Thanks! Mark
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post #6 of 11 (permalink) Old 04-01-2008, 05:50 PM
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Mark,

Plug the vacuum line or replace it with vacuum caps.

Plug or cap the big hose coming from the airbox.

Pull that emissions crap outta there.

P10select - you can do one of 2 things. If ya wanna stay emissions legal, replace the hose with an appropriate sized vacuum hose. Ya can buy it from a good auto parts store by the foot.

Or do a search on coastering or marbled/ marbling/ marbeling and do what a lot of us have done (removes the emissions crap).

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post #7 of 11 (permalink) Old 04-02-2008, 11:34 AM
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Can I get "vacuum caps" from an auto parts store? Or, what did everyone else use?
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post #8 of 11 (permalink) Old 04-02-2008, 11:41 AM
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On mine before I pulled all the stuff out I used a bottle cap with silocone for the big hose that goes to the air box. And at the reed valves I used rubber caps that came off of tool holders (the rubber socket holders) and for the small one at the carb I bought rubber caps at the auto zone.

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post #9 of 11 (permalink) Old 04-02-2008, 01:00 PM
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Thank you. Any chance that not plugging the big hose to airbox and vacuum hose to rear carb would account for my persistent popping during deceleration - even though I have the coasters installed?

I've been chasing an air leak and have cleaned the carbs twice and can't seem to get to the root of the problem.
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post #10 of 11 (permalink) Old 04-02-2008, 04:12 PM
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Yup. Those two hoses need to be plugged and could contribute to the popping.

You should also have your air/fuel mix screws turned out to about 2 1/2 turns. Obviously you gently screw em in till they gently bottom out and then gently turn em out 2 1/2 turns. Notice gently? (do a search if ya don't know where they are)

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