Help!!!!!!!!! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 23 (permalink) Old 03-20-2011, 08:54 PM Thread Starter
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Unhappy Help!!!!!!!!!

Ok before you go making fun, I am a true newbie. so if I don't mention the correct name for a part don't laugh. I got a 1990 Vulcan 750. I always wanted a bike and this one came free from a client. I changed all the fluids - bought new air filters - bought carb boots. I had a fuel leak that was coming from the hoses on the carbs. fix that. removed mostly all the rust from various places. My current dilema is that now my fuel leak is coming from the left side of the air box. HOW AND WHY WOULD I BE GETTING GAS IN THE AIR BOX. Most important how do I make it stop.

He Died So We May Live

1990 Kawasaki Vulcan 750
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post #2 of 23 (permalink) Old 03-20-2011, 09:04 PM
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My dad's 1986 did the SAME thing. The problem turned out to be, the Fuel petcock was shot, so it was ON PRIME all the time! the weight of the fuel in the tank caused it to slowly seep from sitting. it leaked into the FRONT cylinder and past the rings, and into the crankcase. there was about 1.75 gallons of oil/gas mix in there. We rebuilt the fuel tap. changed the oil. fresh filter. Ran it. and no problems since. i gauentee this is your problem. has the bike been sitting before you aquired it? cuz his was sitting for atleast a year with a leaky fuel tap.

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
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post #3 of 23 (permalink) Old 03-20-2011, 09:05 PM
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And welcome to the forum!! Check in on the "newbie" forum. Tell us more aobut your bike! miles? mods? condition? Goodluck! hope i helped!

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
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post #4 of 23 (permalink) Old 03-20-2011, 09:13 PM
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welcome to the madness! don't worry, nobody is going to laugh at you (only with you!). we have nothing but the best people on here that are willing to help you out with you bike or anything!

if it goes vroom or boom, I LIKE IT!
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post #5 of 23 (permalink) Old 03-20-2011, 09:17 PM
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I agree it's the petcock

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vulcanforum.com scuba54220
vroc.org VROC # 32658 (scuba)
1984 kz750 ltd
1982 yamaha maxim 750
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1978 suzuki 250
1964 harley amf
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post #6 of 23 (permalink) Old 03-20-2011, 09:23 PM
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I'd start there man. Order the rebuild kit. Have it done in no time. and you should be on your way. However. make sure no gas gets into your crankcase. that could be VERYYYYY bad if it did and u didnt know. luckily we caught it before we road it.

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
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post #7 of 23 (permalink) Old 03-20-2011, 09:58 PM
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Quote:
Originally Posted by scuba View Post
I agree it's the petcock
x2

1986 Black Kawasaki Vulcan VN750 "Black KAWK"
VN750 #9300 & VROC #33453

EMGO Handlebar, V&H Exhaust, Drop Shocks, Raised/Painted Fork, MeanStreak Seat, Tank Bib, ME880 Oversize Tires, Engine Guard, Custom Mirrors, Chris Products Turn Signals, Ear Shave, 150/42 Jets, PINGEL Fuel Valve, MCCT, Volt Meter, Shendegen R/R, AGM Battery, Coastered, .020 Coils, Relo Gauges & Headlamp, SilverStar Ultra, LED Flashing Brake Light, Center Stand Delete, WOLO Airhorn.
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post #8 of 23 (permalink) Old 03-20-2011, 10:20 PM
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Quote:
Originally Posted by 1986vn750 View Post
My dad's 1986 did the SAME thing. The problem turned out to be, the Fuel petcock was shot, so it was ON PRIME all the time! the weight of the fuel in the tank caused it to slowly seep from sitting. it leaked into the FRONT cylinder and past the rings, and into the crankcase. there was about 1.75 gallons of oil/gas mix in there. We rebuilt the fuel tap. changed the oil. fresh filter. Ran it. and no problems since. i gauentee this is your problem. has the bike been sitting before you aquired it? cuz his was sitting for atleast a year with a leaky fuel tap.
Probably is the petcock, but the prime position is only found on the earliest 3 or 4 models from 1985 to `87 or `88.
Your `90 petcock does NOT have a prime position, but could still leak if the diaphram is broke. A rebuild kit will probably fix it.
Check the inside of the tank for rust or any other crud inside while you are working on it, and clean if needed.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #9 of 23 (permalink) Old 03-20-2011, 10:27 PM
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I was wondering that also, my 2001 has off, on, and res. i dont like this. because i drained my bowls to check for rust or any junk. and it was a pain getting it to restart cuz i couldnt prime it!

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
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post #10 of 23 (permalink) Old 03-20-2011, 10:45 PM Thread Starter
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Yes the bike has been sitting for some time (not sure how long), thanks for the reply will check it out tomorrow and post back with results

He Died So We May Live

1990 Kawasaki Vulcan 750
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