Bike won't start


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kneabling
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Bike won't start

Post by kneabling » Thu Sep 12, 2019 1:36 pm



Hope someone can help. I have a 94 SE 72,000 miles. If it sits for more than 2 weeks (unfortunately it happens), it will not start unless I put gas down the carbs. I can actually run the battery dead trying. If it only sits for a week , it will start right up. I have no idea what this could be. Going out of my mind and tired of having to take it apart for this. If I do have to dump gas in the carbs, once it fires off and starts it is fine.



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Rambozo
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Re: Bike won't start

Post by Rambozo » Thu Sep 12, 2019 1:54 pm

Sounds like float bowls might be leaking down? Check the fuel pump to see if it is running while cranking. When you open it up, if you work the throttle, do you see the accelerator pump squirting any gas into the carb? Low battery can also cause all kinds of no start issues.

kneabling
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Re: Bike won't start

Post by kneabling » Thu Sep 12, 2019 4:37 pm

I will look when I open it up AGAIN :| to prime the system. If it was the accelerator pump wouldn't I have problems even while running, which I don't. I know more about older cars and carbs than bikes so excuse my ignorance if that is the case. Could there be a problem with the fuel pump like a bad seal that Slowly leaks and once the system is dry just can't pick up fuel. Idk just spitballing here

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Rambozo
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Re: Bike won't start

Post by Rambozo » Thu Sep 12, 2019 4:48 pm

I'm not thinking the accelerator pump is bad, but that the float bowls have leaked all the fuel out so there is nothing left to pump. But the electric pump should recover that pretty fast, so that's why I am wondering if the pump is even being driven when cranking. Out of curiosity have you tried just tapping the start button a few times instead of just holding it down cranking?

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WingAdmin
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Re: Bike won't start

Post by WingAdmin » Thu Sep 12, 2019 4:50 pm

I would do a flow test on the fuel pump to see if it is putting out enough.

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4given
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Re: Bike won't start

Post by 4given » Thu Sep 12, 2019 5:02 pm

Fuel shut off diaphragm maybe?

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ct1500
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Re: Bike won't start

Post by ct1500 » Thu Sep 12, 2019 7:18 pm

kneabling wrote:
Thu Sep 12, 2019 1:36 pm
Hope someone can help. I have a 94 SE 72,000 miles. If it sits for more than 2 weeks (unfortunately it happens), it will not start unless I put gas down the carbs. I can actually run the battery dead trying. If it only sits for a week , it will start right up. I have no idea what this could be. Going out of my mind and tired of having to take it apart for this. If I do have to dump gas in the carbs, once it fires off and starts it is fine.
How old are the spark plugs, could they be original or partially fouled? Lots of things can contribute to what you are experiencing and need checking. Petcock or its' vacuum signal not up to snuff, leaking float bowl gaskets, mis-adjusted enrichment cable/actuator, weak battery/current draw, poor charging system voltage. Add um up.
Local and need repair help with your 1500, Valkyrie or ST please click contact
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kneabling
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Re: Bike won't start

Post by kneabling » Sat Feb 22, 2020 4:48 pm

Back again, same issue. Bike will not start if it sits more than a couple days. I have done a flow check on the pump about 42 oz. Per minute. I did take the fuel pet **** line to the carb off and do not seem to be getting flow after petcock. Could that be bad?

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MikeB
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Re: Bike won't start

Post by MikeB » Sat Feb 22, 2020 6:10 pm

Certainly. That valve needs to flow freely when there is vacuum applied to it. With the engine not running, there will be no vacuum and no flow through the valve.

Maybe you need to test the valve. This procedure is from the service manual:


However, if it starts and runs fine after putting fuel into the carbs, then there is a possibility it is not the Auto Fuel Valve. Have you taken it for a ride after getting it to run previously? If the auto fuel valve is bad, the bike will bog down after a while at 60 mph or so. If the Auto Fuel Valve checks okay, it could be the carbs leaking down while sitting unused.
MikeB
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kneabling
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Re: Bike won't start

Post by kneabling » Sun Feb 23, 2020 12:09 pm

So I dumped fuel in the carbs and got it running. Mike you mentioned the carb bowls draining dry. Even if that is the case why does it not want to get fuel through the valve on initial start up after sitting for a while. And then once it's running it seems to run fine. I did not take it out on a ride, however when this has happened before I have and all was well.

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MikeB
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Re: Bike won't start

Post by MikeB » Sun Feb 23, 2020 3:10 pm

I'm curious, how do you manage to get fuel into the carbs?
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kneabling
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Re: Bike won't start

Post by kneabling » Sun Feb 23, 2020 9:57 pm

Take the top fairing and everything apart down to the carbs and pour some in.

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MikeB
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Re: Bike won't start

Post by MikeB » Sun Feb 23, 2020 11:45 pm

That is quite a bit of work just to do a test start. I am sure if I had to do that, I would certainly test that Auto Fuel Valve while I had it apart.
MikeB
Tacoma, WA, USA

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virgilmobile
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Re: Bike won't start

Post by virgilmobile » Mon Feb 24, 2020 8:21 am

Keep in mind something about the fuel shutoff valve.
It's vacuum operated.
Check the hose feeding it.They tend to get hard and leak at the manifold.
Also..Do not open the throttle when trying to start the bike.You will loose vacuum to open the valve.

kneabling
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Re: Bike won't start

Post by kneabling » Mon Feb 24, 2020 11:31 am

So I did take the auto fuel valve apart and the one large diaphragm is ripped. I do have a new one on order to rebuild it I will also have to take the inner fairings and stuff apart to check that vacuum line and see how that looks.



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