Need a good petcock/fuel valve! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 23 (permalink) Old 12-28-2012, 07:11 PM Thread Starter
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Need a good petcock/fuel valve!

I can't get my petcock to stop leaking, I've done about everything I can think of, including putting in a rebuild kit and stretching out the spring in it to see if it would help in closing the valve.

So I'd like to buy one that's in good shape. Pretty tired of dealing with this with no results at all. Anyone got one for sale?

1985 VN700 unknown mileage (over 33K)

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post #2 of 23 (permalink) Old 12-28-2012, 07:17 PM
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When you say it is leaking, is that externally or is fuel coming out to the carbs without vacume?

04-3,200 miles bought July 2011 with 928 miles. Loaded with acessories to many to list here, see my albums for more details! I also make a custom tank bib specific for the 750 if anyone is interested, ck my albums for some pics.
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post #3 of 23 (permalink) Old 12-28-2012, 07:33 PM Thread Starter
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Fuel coming out of the proper outputs but without vacuum applied to it.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #4 of 23 (permalink) Old 12-28-2012, 10:55 PM
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Have you opened it up and cleaned out the insides ? Theres a tiny rubber diaphragm in there...if it gets a decent size speck of dirt, or dries out, that could cause seepage...
And there's another thread here someplace about using a Yamaha petcock, not vaccuum acctuated....its just one outlet, so you'd need a brass "tee" to split the lines...



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post #5 of 23 (permalink) Old 12-28-2012, 11:11 PM Thread Starter
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Yea, I opened it up, cleaned it up real well and put the whole rebuild kit in it, stretched the spring a little bit to make up for wear and the valve still remains open :-/

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #6 of 23 (permalink) Old 12-28-2012, 11:25 PM
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...odd, since you rebuilt it...hmmmm...now....yers is an 85 like mine...you DO know that if you have it set to prime, it WILL run all the time, yes ?...keep it on on or res....if its still leaking and it wasnt on prime, then the unit itself must be shot...

In theory, with the older petcocks with the prime setting, you can remove the vaccuum line completely and plug, use the on/res for the OFF and the prime for the ON...



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post #7 of 23 (permalink) Old 12-29-2012, 01:12 AM Thread Starter
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lol yea I know, I tried it in both res and on, and they both leak... "pri" gives me a full flow.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #8 of 23 (permalink) Old 12-29-2012, 04:36 PM
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Okay, so its not an actual leak, but a trickle....sounds like that lil vaccuum diaphragm then....try this...blow INTO the vac line going into the petcock....see if that stops it....if it doesnt, then the diaphragm is bad....OR the diaphragm seat...

In a pinch, until you fix it, plug both ends of that vaccuum actuator line...the one on the petcock will fill with gas, and you can run the bike on prime then....but it really sounds like its a diaphragm problem...best option IMO is to go with a non-vac replacement....I'll be doing that myself soon...too much frickin safety crep on these bikes nowadays...



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post #9 of 23 (permalink) Old 12-29-2012, 06:38 PM Thread Starter
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I put in a new diaphragm, since it came in the rebuild kit. I think the real issue might be the spring that keeps it shut, cause the o-rings and the diaphragm are new.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #10 of 23 (permalink) Old 12-29-2012, 06:45 PM
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Got to ask a stupid ?, did you put the spring on the correct side of the diaphram. Would be easy to put it on the nipple side!

04-3,200 miles bought July 2011 with 928 miles. Loaded with acessories to many to list here, see my albums for more details! I also make a custom tank bib specific for the 750 if anyone is interested, ck my albums for some pics.
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