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Discussion Starter #1
Hi guys...
During the last days I am experimenting a strange situation when trying to start on my Brutale.

I move the key to the on position and let the bike makes the checks before start it...but when it finish...you can still hear a buzz from the engine that never stops...it is like a "piii..trrrr...piii...trrr". When pushing the stat button..the bike starts with no problem.

Anybody knows what it is this strange buzzing sound????
 

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What´s the buzz?

Hi Celica,

my best guess is the injection fuel pump running to keep the fuel preassure up as it assumes you want to start the engine after turning on the ignition.
 

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Discussion Starter #3
Hi Celica,

my best guess is the injection fuel pump running to keep the fuel preassure up as it assumes you want to start the engine after turning on the ignition.
So, in that case, is it a normal behaviour?
 

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Discussion Starter #5
I have been talking with my MV dealer and they say it is probably the fuel pump, as maximustinnitus previously commented...but...they want to see the bike...maybe because it is not normal...
 

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Mine does not do that.

What steering stabilizer is that on your bike
 

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Um, no...

My 1090 does not do that. There is a high pitched wine, kind of like the high voltage when the TV is on, but nowhere near that. That sounds like the servo motor for the exhaust valve if the 990's have them. Look down on the right hand side of the bike by the exhaust and see if the cables on the servo are moving in unison to the noise...
 

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Discussion Starter #10
Mine does not do that.

What steering stabilizer is that on your bike
FGubellini...is the brand that produces the steering stabilizer for MV Agusta Corse.
 

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Discussion Starter #11
My 1090 does not do that. There is a high pitched wine, kind of like the high voltage when the TV is on, but nowhere near that. That sounds like the servo motor for the exhaust valve if the 990's have them. Look down on the right hand side of the bike by the exhaust and see if the cables on the servo are moving in unison to the noise...
Jones, the 990 have exhaust valve and I am agree with you that this sound comes from the unit that controls this valve...
 

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Exhaust valve...

Jones, the 990 have exhaust valve and I am agree with you that this sound comes from the unit that controls this valve...
Well then, you should be able to see the cables moving. Go take a look! When the engine starts does the sound continue?

Give your battery a charge and see if it continues after the charge...
 

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Discussion Starter #13
Well then, you should be able to see the cables moving. Go take a look! When the engine starts does the sound continue?

Give your battery a charge and see if it continues after the charge...
I have tested the exhaust valve...before start on the bike...there is no movement on the cables but you can hear the strange noise we are talking about. Then, I start on the bike and throttle below 2000 rpms...there is no movement...but this is normal. The exhaust valve is closed below 2000 rpms to prevent noises. OK, now I throttle the bike above 2000 rpms and over 6000 rpms...NO MOVEMENT on the cables. So, I think the problem is in the servo motor that controls the valve...what do you think?
 

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Sounds good to me...

I have tested the exhaust valve...before start on the bike...there is no movement on the cables but you can hear the strange noise we are talking about. Then, I start on the bike and throttle below 2000 rpms...there is no movement...but this is normal. The exhaust valve is closed below 2000 rpms to prevent noises. OK, now I throttle the bike above 2000 rpms and over 6000 rpms...NO MOVEMENT on the cables. So, I think the problem is in the servo motor that controls the valve...what do you think?
Maybe the cables came off the electric motor side. When I turn on the key the servo cycles one time, I assume, to make sure all is well. I'd try to trace the cables (Mechanical) from the servo to the innards of the bike to see if you can locate the servo motor... It looks like its on the right side of the trellis. See the attached image...

Edit: The servo motor is on the left side of the frame in front of the voltage regulator. On my bike it is the unit that is emitting the hi-pitched whine. If you rech inside and place pressure on the wheel where the cables connect, the whine will subsude. Much like a servo in a remote control model. I bet your servo is confused and twitching back and forth... Definately a dealer issue...
 

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Discussion Starter #15
Jones, thank you for the information...now the problem is identified. I have been talking with my dealer to solve this issue.

Thanks again!
 

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Discussion Starter #17
Hi guys...

Good news...Finally, it just a wire that was slackened...so problem solved.

Let's see what it next!

Thanks all for your help.
 
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