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Triumph SuperSports Triumph Four-Cylinder Enthusists: TT600, Speed4, and Daytona 600/650

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Old 10-21-2012, 05:16 PM   #1 (permalink)
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Bike doesn't want to crank when it's warmed up

I have a 06 S4.

When it's cold in the morning, it fires up at the first try.

If I ride around to get it up to operating temps, if I turn it off, and try to crank it back up, it won't fire.

It does sort of fire up then immediately dies. I have to let it cool off before it will start.

I know it's not the battery. Any ideas?
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Old 10-21-2012, 09:02 PM   #2 (permalink)
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It could be a clogged vent in the fuel tank. Usually that causes the reverse problem - starting issues when it is cold. It is worth a look anyway.
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Old 10-21-2012, 09:21 PM   #3 (permalink)
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Checked valve clearances lately? Tight valves may do this.
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Old 10-24-2012, 09:28 AM   #4 (permalink)
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I will check the fuel tank vent. Where is it anyway? haha

The bike did it since I bought it last year. After I got it, I had the dealer do a full service.

It seems to have gotten worse. Months ago, it wouldn't do it often at all, and if so, it would take 3 tries to get it to crank. Now it's dead in the water until it cools off.
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Old 10-24-2012, 04:47 PM   #5 (permalink)
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I'm a total noob when it comes to these bikes, but in old volvos usually a hard warm start is due to a bad coolant temp sensor, crank position sensor/hall effect sensor or one of the FI relays. I don't know if that gives you any ideas.
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Old 10-24-2012, 08:35 PM   #6 (permalink)
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Ah, yes, that's worth trying. The 2000 TT600 I had indicated overheating because the sensor went TU, and it wouldn't start because it thought the motor was warm when it wasn't. Good suggestion.
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Old 10-24-2012, 09:10 PM   #7 (permalink)
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Would it throw a code if a sensor is bad?
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Old 10-25-2012, 02:22 PM   #8 (permalink)
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I don't think so. I don't recall any engine light coming on when my temperature sensor went off.
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Old 11-08-2012, 08:20 PM   #9 (permalink)
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My air idle control valve was disconnected. The dealer charged me $247 to diagnose it and plug it back in.
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