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post #1 of 42 (permalink) Old 03-20-2019, 11:20 PM Thread Starter
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Runs for a few seconds and dies

My speedy did this once before but then didn't for a while. It was running and then RPM drops and stalls. This time it's not coming back. First was a minute then a few seconds and then died immediately after start.
Here's the last recording: https://www.dropbox.com/s/j4blt9wci1cn6np/dies.m4a?dl=0
What could this be?

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post #2 of 42 (permalink) Old 03-20-2019, 11:26 PM
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Quote:
Originally Posted by owly View Post
My speedy did this once before but then didn't for a while. It was running and then RPM drops and stalls. This time it's not coming back. First was a minute then a few seconds and then died immediately after start.
Here's the last recording: https://www.dropbox.com/s/j4blt9wci1cn6np/dies.m4a?dl=0
What could this be?
Did you happen to see DEcosse's reply on your other thread? https://www.triumphrat.net/2003895510-post4.html

Bring out the gimp.
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post #3 of 42 (permalink) Old 03-20-2019, 11:43 PM Thread Starter
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Originally Posted by Speedy Russ View Post
Quote:
Originally Posted by owly View Post
My speedy did this once before but then didn't for a while. It was running and then RPM drops and stalls. This time it's not coming back. First was a minute then a few seconds and then died immediately after start.
Here's the last recording: https://www.dropbox.com/s/j4blt9wci1cn6np/dies.m4a?dl=0
What could this be?
Did you happen to see DEcosse's reply on your other thread? https://www.triumphrat.net/2003895510-post4.html

Yes thanks. I'm this case it wasn't dying from dead battery. Rr was generating over battery charge when it died.

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post #4 of 42 (permalink) Old 03-22-2019, 03:43 PM Thread Starter
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I'm having trouble diagnosing the problem.
The spark plugs don't look great, but not horrendous. I'll replace them.
When I try to start it, if I place a rag in the exhaust, it gets blown out (compression, although not a valid test). It does smell of gas (combusted?) so there should be gas arriving to the plug.
The air filter is fairly unclogged.
So it appears I have air - actually haven't check idle air flow.
There appears to be gas.
I'll change the spark plugs to ensure that's not the issue.

Any suggestions on what to explore next?

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post #5 of 42 (permalink) Old 03-22-2019, 05:08 PM
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Fill up the gas as well, I had the same issues once and also looked like it had enough gas but apparently it doesn’t.
After days of troubleshooting was pretty embarrassing to report it had no gas even tho the low gas light was off!
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post #6 of 42 (permalink) Old 03-22-2019, 05:20 PM
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Quote:
Originally Posted by owly View Post
I'm having trouble diagnosing the problem.
The spark plugs don't look great, but not horrendous. I'll replace them.
When I try to start it, if I place a rag in the exhaust, it gets blown out (compression, although not a valid test). It does smell of gas (combusted?) so there should be gas arriving to the plug.
The air filter is fairly unclogged.
So it appears I have air - actually haven't check idle air flow.
There appears to be gas.
I'll change the spark plugs to ensure that's not the issue.

Any suggestions on what to explore next?
Hey there, I know its a shot in the dark but...

I had a similar problem with mine not too long ago. I tore it all down, put the injectors on a 9V and made sure they activate, checked each plug to make sure i saw spark on all of them and charged the battery up to FULL, and finally was pouring fuel directly into the throttle bodies through the airbox.

When I put fuel in the airbox, and tried to start - the bike ran, and continued to run until it ran out of fuel that I poured in (like 5 seconds max).

The fuel pump was spinning up, and everything sounded "normal" during a good startup.

When i disconnected the fuel lines from the tank, it seemed like the lines were pressured up, so I was so f'ing confused, it seemed like I had air, fuel, spark - so WTH.

Finally (BIG BIG thanks to DeCosse for hanging in there with me) I gave up and trailered the bike to a shop.

Whether it was true or not, the mechanic said the fuel pressure regulator inside the tank had failed, and the pump was priming up the fuel lines, but as soon as the injectors needed the fuel, the pressure would drop to well below operational pressure needed, and the lines would depressurize, and it would not be enough to spit fuel into the cylinders.

Anyways, thats my story. I hope somehow it helps.
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post #7 of 42 (permalink) Old 03-23-2019, 06:17 PM Thread Starter
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Quote:
Originally Posted by 99_rrdifflock View Post
... When I put fuel in the airbox, and tried to start - the bike ran, and continued to run until it ran out of fuel that I poured in (like 5 seconds max).
...

Well it appears I may have that problem.
I have spark, air, and when I pour fuel directly in the motorcycle starts.
When I turn on the bike I hear the fuel pump doing its thing, so maybe my pump still works and it's only the pressure sensor.

Anyone know if there's a simple way to test that on my own?

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post #8 of 42 (permalink) Old 03-23-2019, 06:42 PM Thread Starter
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Added info: I just reversed the red and white hoses from the tank and it started but then died.
I read the direction of flow didn't matter. Not sure what that might indicate though.

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post #9 of 42 (permalink) Old 03-24-2019, 01:59 PM Thread Starter
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So I removed the throttle body and looked inside. Fuel is getting spit in by each of the three injectors. So I should have fuel. Although when I pour some fuel directly in it starts. So maybe not enough is getting spit in?

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post #10 of 42 (permalink) Old 03-24-2019, 03:25 PM
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Why don't you measure the fuel pressure then. It seems you can find the fitting set on amazon.
It can be a faulty pressure reg or a pin hole in the inner tubing. Happend to one of Kit's biked if I remember well.

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