Grrrr Help any ideas? - 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 26 (permalink) Old 04-29-2011, 10:53 PM Thread Starter
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Grrrr Help any ideas?

Ok so two days ago my 1996 VN750 Ca. model starts to bog down right off idle and dies if you dont play the rev game at a stop light. This is a serious bog point right off idle like the bike will almost die even with me attempting to rev through it.

I get home, pull the tank and check for the myster hose leading from the t to the right ear. It was connected to the bottom of the gas tank guage sensor . So I route it to the ear like I am supposed to. Button everything back together and it seems to run fine.

Bike sits for two days. OH I was on reserve for a bout 10 miles before heading home but it was doing all this before I hit reserve.

Now its really hard to start, and with no load I need to really play with the throttle and choke to get it to start. I thought I might be out of gas but I limped it to the gas station and filled up. Now the bog is back and worse than ever. Like going 75 down the freeway if I pull in the clutch and let off the throttle it dies completely. I even popped the gas tank fuel nozzel off to see if it was a bad case of POOGS.

On the side of the freeway I pulled the vent hose from the ear and tried it numerous positions, under tank, back in ear again, facing forward under tank, backwards etc...

Any suggestions to try? I cant decide if I have junk in the carbs for running on reserve or if its that darn hose. I have a 35 mile trip home in the morning but I can work on it tonight.

1996 VN750 all stock.
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post #2 of 26 (permalink) Old 04-29-2011, 11:28 PM
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Originally Posted by dot4x4 View Post
Ok so two days ago my 1996 VN750 Ca. model starts to bog down right off idle and dies if you dont play the rev game at a stop light. This is a serious bog point right off idle like the bike will almost die even with me attempting to rev through it.

I get home, pull the tank and check for the myster hose leading from the t to the right ear. It was connected to the bottom of the gas tank guage sensor . So I route it to the ear like I am supposed to. Button everything back together and it seems to run fine.

Bike sits for two days. OH I was on reserve for a bout 10 miles before heading home but it was doing all this before I hit reserve.

Now its really hard to start, and with no load I need to really play with the throttle and choke to get it to start. I thought I might be out of gas but I limped it to the gas station and filled up. Now the bog is back and worse than ever. Like going 75 down the freeway if I pull in the clutch and let off the throttle it dies completely. I even popped the gas tank fuel nozzel off to see if it was a bad case of POOGS.

On the side of the freeway I pulled the vent hose from the ear and tried it numerous positions, under tank, back in ear again, facing forward under tank, backwards etc...

Any suggestions to try? I cant decide if I have junk in the carbs for running on reserve or if its that darn hose. I have a 35 mile trip home in the morning but I can work on it tonight.
sounds like a vacuum leak either at the petcock or the line going to it could be suspect,also do you have the emission controls still on it if so the emissions valve or the hose that goes from the carb to it could be cracked /broken or leaking or your petcock it self may be clogged,and when you turned it back to run it is acting weird .

I'd check for vacuum leaks and petcock problems first, then move on to other stuff ,it may be something simple.




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post #3 of 26 (permalink) Old 04-29-2011, 11:50 PM Thread Starter
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thanks I will check around those tonight. Yes all CA. smog stuff is connected.

One other thing I remember is that I blew some air into the "blue" vent line and gas came out of the "red" hose that comes from the CA smog canister. Just to be clear both lines were disconnected from the tank and were going into the maze that is the smog system. I didnt trace those lines but I could never get anything to come out of the "vent hose that exits in front of the rear wheel".

I am thinking once I get home I need to just gut the CA smog stuff. I know I am giving alot of information but the bike was running beautiful for the first week and three tankfulls that I had it.

1996 VN750 all stock.
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post #4 of 26 (permalink) Old 04-30-2011, 01:38 AM
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thanks I will check around those tonight. Yes all CA. smog stuff is connected.

One other thing I remember is that I blew some air into the "blue" vent line and gas came out of the "red" hose that comes from the CA smog canister. Just to be clear both lines were disconnected from the tank and were going into the maze that is the smog system. I didnt trace those lines but I could never get anything to come out of the "vent hose that exits in front of the rear wheel".

I am thinking once I get home I need to just gut the CA smog stuff. I know I am giving alot of information but the bike was running beautiful for the first week and three tankfulls that I had it.
Those lines coming out of the gas tank at the bottom are vents I think. Those hoses connected just suck those vapors back in to be burned in the motor.

Once you get through the boggy band it will run 75mph though?

1995 VN750 - 10K
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post #5 of 26 (permalink) Old 04-30-2011, 01:51 AM Thread Starter
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Those lines coming out of the gas tank at the bottom are vents I think. Those hoses connected just suck those vapors back in to be burned in the motor.

Once you get through the boggy band it will run 75mph though?
Oh absolutely I ran at 90 for a couple of minutes because I was running late I cruised 75-80 the rest of the way. That is what has me confused the most.

1996 VN750 all stock.
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post #6 of 26 (permalink) Old 04-30-2011, 02:10 AM
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I dont think this has anything to do with the problem, but I think the T that comes from the bowl vents (in between the fuel lines) goes to the port on the gas tank sensor... If this is the one you're talking about..

Otherwise, ruling out all things easy (vacuum leaks, etc), I would bet that there is some shiza in your pilot jet(s). Folks swear by the SeaFoam, which might save you a major headache . Just for an easy verification, you might drain the bowls and see if there is some obvious debris in there. Even if there is not a planter worth of dirt in there, it could still be clogged. The holes in those jets are sooooo small..

Is this the only motorcycle in the world without a fuel filter?

1995 VN750 - 10K
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post #7 of 26 (permalink) Old 04-30-2011, 02:20 AM Thread Starter
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Yea I will be picking up some seafoam for sure. I bought the bike and have paperwork from a shop that cleaned the tank, cleaned carbs and sync'd them. The way its acting I am thinking its a vacuum leak. I will be double checking everything when I leave in the morning. Were a person short and I just booked in another guy so I can't sneak out to the lot and look at it now .

1996 VN750 all stock.
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post #8 of 26 (permalink) Old 04-30-2011, 04:09 AM
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It seems to be acting exactly as if it has no fuel. This happens when I run out of fuel and have to switch to reserve. Might want to check that there's actually fuel coming out of the petcock when you apply vacuum to it. It's the first place that fuel has to come out of, so it makes sense to check that first. Also, maybe check if there is vacuum being applied to the petcock. Just pulling on the vacuum hose and feeling it with your finger should tell you if there is vacuum (with the engine running).

The smog stuff is pretty easy to plug, you can do it wherever you're at... find a couple marbles for the hoses that go to the reed valves and disconnect the vacuum hose that goes to the right carb and plug it with anything that will do the job (I think I used a screw that fit in it). I don't remember if there was other stuff that needs to be done, but I think that's it. This is just in case you want to eliminate the smog system as the cause of the problem.

If the previous doesn't help at all, it's probably the carbs then. seafoam might help you without taking the carbs off but if it doesn't, taking them off would be the best choice since you can check the jets and the diaphragms as well.
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post #9 of 26 (permalink) Old 04-30-2011, 06:22 AM
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It looks like he already had the Carbs Serviced..........

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Yea I will be picking up some seafoam for sure. I bought the bike and have paperwork from a shop that cleaned the tank, cleaned carbs and sync'd them.
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If the previous doesn't help at all, it's probably the carbs then. seafoam might help you without taking the carbs off but if it doesn't, taking them off would be the best choice since you can check the jets and the diaphragms as well.

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post #10 of 26 (permalink) Old 04-30-2011, 10:21 AM
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