Thruxton noise on ignition - Triumph Forum: Triumph Rat Motorcycle Forums
Water Cooled Twins Technical Talk Technical Talk for water cooled Triumph Twins.

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post #1 of 10 (permalink) Old 05-27-2016, 04:35 PM Thread Starter
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Thruxton noise on ignition

When I turn the ignition key on my Thruxton before pressing the starter the bike does its little prep routine, then there is a constant light whirring noise from somewhere in the engine.

I don't recall this on my previous Triumphs. I guess it is normal but thought I would check. Thanks
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post #2 of 10 (permalink) Old 05-27-2016, 06:17 PM
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Don't know for certain but I'll bet it's either the radiator fan or the fuel pump.
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post #3 of 10 (permalink) Old 05-27-2016, 07:37 PM
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My t120 has the same noise, before starting if you move the throttle you'll notice it change pitch
I think it's the fuel pump and is nothing to worry about
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post #4 of 10 (permalink) Old 05-27-2016, 09:15 PM
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That noise come from the electric system that control butterfly valve. the noise will change when you twist throttle and you could hear valve moving inside engine carb.
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post #5 of 10 (permalink) Old 05-28-2016, 12:27 AM
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That makes sense
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post #6 of 10 (permalink) Old 05-28-2016, 01:04 AM
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Quote:
Originally Posted by Wilco10 View Post
I don't recall this on my previous Triumphs. I guess it is normal but thought I would check. Thanks
Wow. You're right. That sound did not happen on my '14 or '98 Triumphs - sure, they made sounds resetting the stepper motor and priming the fuel pump but then it stopped once done.

I noticed this new bike keeps making the whirring sound like you said, as long as the key is on. I was a little concerned the first time I heard it, but chocked it up to 'these darn kids... what will they think of next' ; -) After reading this thread, I went to the garage to see if it did change sound with the throttle position and - it does. You can make the darn thing sound like R2-D2 !

I'm pretty sure it's suppose to do that, but I really wonder why. What exactly is going on there?
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post #7 of 10 (permalink) Old 05-28-2016, 03:03 AM
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It could be something to do with a phenomenon called stiction, the static friction present in the sort of moving parts associated with electronic throttles, suspension systems, fluid valves, etc.

An electrical signal, independent of the proper control one (I think it's called an oscillating or "dithering" signal) coming from the twistgrip is constantly injected into the DC motor that controls the butterfly valve and keeps it "exercised" as it were.

As an example we have a machine at work that injects sticky chemicals to be mixed together to produce a packing foam and even at rest there's a constant humming coming from the mixing valves as they're moved to and fro by a tiny amount.
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Last edited by Forchetto; 05-28-2016 at 04:03 AM.
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post #8 of 10 (permalink) Old 05-28-2016, 03:04 AM Thread Starter
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Thanks for the replies that sets my mind at rest.
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post #9 of 10 (permalink) Old 09-08-2019, 04:15 PM
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Hi guys i got Speed Triple, after turning the ignition on there’s a sound like in my video. This situation remains few second after turning ignition completely off. Is this sound ur talking about? Any one know what’s that and whether this situation requires repairing? https://m.youtube.com/watch?v=D9j_nV4Q2GY
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post #10 of 10 (permalink) Old 09-12-2019, 02:58 AM
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Yep, that's the sound. My XE does the same. Managed to fix the noise by putting on my earplugs and helmet before turning on the ignition
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