Won't Start, gas comes out of the over flow line - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 48 (permalink) Old 10-28-2009, 02:06 AM Thread Starter
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Won't Start, gas comes out of the over flow line

I just bought a 1986 750 and it won't start, after I try to start it I notice that there is fuel dumping out the over flow line. What could be causing that? Stuck Floats? Carbs need to be removed and cleaned? ....

Any help would be appreciated
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post #2 of 48 (permalink) Old 10-28-2009, 05:11 AM
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You have a stuck float or debris in the float valve, try tapping on the side of the carbs.


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post #3 of 48 (permalink) Old 10-28-2009, 05:12 AM
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Has the bike been sitting for a long time? Get a can of Seafoam and put about 3 oz. in the tank and put some directly in the bowl. It is a miracle drug for tanks and carbs. Check the Verses out, lots of information there on this topic. You can get Seafoam at most auto parts stores for about $8-9 a can. This would be my first step, I'm sure others will chime in with sound advice because they've been through this same thing. I eventually had to have my carbs removed and cleaned but then the bike sat for almost 10 years without being run.

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post #4 of 48 (permalink) Old 10-28-2009, 01:21 PM Thread Starter
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It has been sitting for a while, but there is Seafoam in it already. Considering Seafoam is an additive to make the fuel stable for storage and doesn't have any cleaning agents in it. I was thinking of doing what was suggested in the Versus thread for Cleaning Carbs, I can't post the URL in here because I haven't posted at least 5 times. But it is the one talking about Cleaning / Rebuilding Carbs. I'll try tapping the bowls and Carb Cleaner to see what happens, will let you know.
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post #5 of 48 (permalink) Old 10-28-2009, 03:26 PM
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Read the SeaFoam label! It can be used in injector cleaning machines and dissolves gum and varnish in carbs like kids eat ice cream!

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
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post #6 of 48 (permalink) Old 10-28-2009, 06:14 PM Thread Starter
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Quote:
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Read the SeaFoam label! It can be used in injector cleaning machines and dissolves gum and varnish in carbs like kids eat ice cream!
Yeah, I didn't know that until today after I posted, oops
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post #7 of 48 (permalink) Old 10-28-2009, 07:48 PM
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Quote:
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Yeah, I didn't know that until today after I posted, oops
Well, my eureka moment came when someone here posted that Sta-bil has a two year shelf life once it's opened. Says so on the label I never read. Guess how long BOTH my 3/4 full bottles of Sta-bil have been open!

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #8 of 48 (permalink) Old 10-28-2009, 10:06 PM Thread Starter
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Glad I could help I didnt' have any luck yet, I need to buy some gas line clamps to shut the gas off so I can open the bowl drain plugs to spray carb cleaner through the carb. Hopefully that will help, I will need to change the plugs also. Then I happened to notice that the right turning signal doesn't work (not the bulbs), will have to figure that one out with the trusty volt meter.
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post #9 of 48 (permalink) Old 10-28-2009, 10:16 PM
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Unless your petcock is defective, why can't you just disconnect the fuel line hoses at the petcock or carb and drain the carbs? The carbs "pull" gas through the central vacuum line on the petcock. If the engine's not turning over, there's no vacuum and no fuel flow. Should also be able to just turn petcock to "OFF" and prevent gas from flowing to carbs.

Get the iridium plugs, should be the last plugs you have to buy (NGK 7803 OR NGK DPR7EIX-9) and they give excellent cold and hot starts. Cheapest I've found is a little less than $5 each at ORileys.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts

Last edited by flitecontrol; 10-28-2009 at 10:20 PM.
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post #10 of 48 (permalink) Old 10-28-2009, 11:23 PM Thread Starter
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There is no "OFF" on the petcock, only "RES", "ON" & "PRI". That was the first thing I thought of doing, but to no avail, it didn't work. I opened the drain for the bowl on one of the carbs and waited for a while to see if it emptied, the flow was steady. So then tried to clamp the furl line to that carb with a pair of forceps I have, that didn't work. So I figured I woudl get better clamps than forceps (made for this) and then empty that one carb, clean it with a Spary Can of Carb Cleaner (through the drain) and hope that works.
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