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Author Topic: High pitch sound after removing the speed limiter  (Read 404 times)

Marklar

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High pitch sound after removing the speed limiter
« on: March 27, 2018, 05:02:24 PM »

I bought a 2007 aquila GV 650 when i obtained my license. Now i've the A license so a few weeks ago, a mechanic removed the speed limiter of my bike. I was really happy with this bike but since that, a high pitch noise has appeared. The sound seems to depend on the engine revolutions, more or less. it starts in 2 gear at 50km/h, below this speed it doesn't sound, and above 60km/h it stops. In 3 gear the threshold is higher. It seems to be related to vibrations. Something that is not tighteen enough, and it clearly started after removing the limiter. The mechanic also changed oil, air filter...
Any ideas? The sound is really annoying.

Thanks for reading!
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umop-ǝpisdn

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Re: High pitch sound after removing the speed limiter
« Reply #1 on: March 29, 2018, 02:12:36 AM »

Hmm. related to engine RPM.

Did it happen before the removal of the restrictor?

If not, then it might be the synchronisation of the throttle bodies. So what does that mean?

When you have two, separate carbies, you need to make sure that they open the same amount and at the same time. example. If the front carby is open to 20%, but the rear is only open to 10%, then the engine will shake.

The mechanism for adjusting the throttle body synch is close to the throttle restriction plate that the mechanic would have removed to allow you to use full power.
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Marklar

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Re: High pitch sound after removing the speed limiter
« Reply #2 on: April 06, 2018, 12:34:36 AM »

Today when i was driving, i put a hand on the gas tank and the sound seems to stop or at least to lower.

Tomorrow i will tighteen the screws.

I know that this sounds very stupid.

I'll tell if this solves the problem.
« Last Edit: April 06, 2018, 09:55:30 AM by Marklar »
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Hylife

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Re: High pitch sound after removing the speed limiter
« Reply #3 on: April 09, 2018, 06:37:19 AM »

Today when i was driving, i put a hand on the gas tank and the sound seems to stop or at least to lower.

Tomorrow i will tighteen the screws.....

I agree, sounds like something is loose and vibrating on your tank or has not been re-fitted properly.
Removing the restrictor plate from the throttle body requires taking off the tank, the airbox, and disconnecting the throttle cables to gain access to the required area.
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spit051261

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Re: High pitch sound after removing the speed limiter
« Reply #4 on: April 09, 2018, 07:41:42 AM »

Make sure the 2 rubbers are fitted to the under side of the tank .
They basically stop the tank from moving if it's the same as a GT/GTR 650 .
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