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Author Topic: The Vulcan takes off!  (Read 1051 times)
chippyzip
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« on: July 05, 2017, 13:53:29 »

Hi,

Just recently I've noticed that whenever my X10 reaches 60mph, it makes a howling noise, like a Vulcan aircraft taking off! but go just after 60mph, and the noise dies down- anyone else have this "feature" I'm trying to narrow down the cause, I'll start by removing the Givi windscreen, and see what that does, apart from the noise and wind rattling my helmet!!    https://www.youtube.com/watch?v=w1igQoRqpBA

Graham
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« Reply #1 on: July 05, 2017, 17:42:32 »

Could be tyre(s).
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chippyzip
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« Reply #2 on: July 05, 2017, 17:54:26 »

Could be tyre(s).

Just Installed 2 brand new ones (Michelin city grips ), but how can/why the tyres make that sound at 60mph? I thought it might be wind related!

Graham
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« Reply #3 on: July 06, 2017, 07:08:21 »

At a guess it's possibly because the edges of all the treads are sharp and as they wear more rounded and all those little moulding spikes wear off the noise should go away. I doubt it's airflow related or everyone would have it permanently.
They probably produce a sound at all speeds but the frequency will vary and it's only around 60mph you can hear it.
I often wonder what it is dogs hear that humans don't as they often seem to turn their heads and look at bikes as they pass but ignore cars.
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'04 X9 500 Evo in YELLOW - LED's, K&N, twin lights, bleepers...
'12 NC700D Integra in Cherry Red, K&N, panniers, bleepers...
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« Reply #4 on: July 06, 2017, 13:31:19 »

If you ride in a heavy wind do you get the howl both going into the wind and riding with the wind? If yes then it's not wind related.

My City Grips (both new pair) never howled but... One of the old pair was improperly balanced and caused a rhythmic shaking at anything over 70MpH.
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chippyzip
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« Reply #5 on: July 06, 2017, 16:53:39 »

If you ride in a heavy wind do you get the howl both going into the wind and riding with the wind? If yes then it's not wind related.

My City Grips (both new pair) never howled but... One of the old pair was improperly balanced and caused a rhythmic shaking at anything over 70MpH.

Makes no difference, as to the wind, but it all depends on the road, I've found. If it's a fairly new road, the sound subsides, making it more bearable, but on a well worn road, the noise reappears, again only at 60 mph. I thought it was my front mudguard, but the tyre theory seems to run true.. Funnily enough, although I hated the original Sava tyres, due to them being crap they never made this noise! Maybe tyre pressure could have something to do with this?? I'm going to have to do some more research...!

Graham
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« Reply #6 on: July 06, 2017, 19:00:33 »

Nope, no funny noises here. And I have Michelin City Grips.




Is the Givi screen the tall one with the "hand guards", did try one on the blue X10, bit of a waste of space, has to be so far forward so the bars don't hit the "hand guards", and a bit too much like a sail du e to its size, in fact in hindsight I wonder if it was one of the contributing factors to my writing off the scoot, it was a Sunday of a weekend of terrible south westerly gales.

Simple test, put stock screen back on.


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« Reply #7 on: July 07, 2017, 05:07:20 »

Ok.. here's what I've got on tyre pressure:

The manual calls for 2.3bar front and 2.4bar rear or 2.6bar if you're got a passenger

... however ...

My tyre guy, who just mounted my new set of Grips says
2bar front and 2.3bar rear

I've ridden with both and (obviously) some in between but I've never had the noise you're talking about under "normal" road conditions.
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chippyzip
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« Reply #8 on: July 07, 2017, 20:36:39 »

I've ust tried riding at 2.0 bar, with no difference... next I'm trying the same tyre pressure and those air vents near the lights covered up...

Graham
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« Reply #9 on: July 07, 2017, 21:08:17 »

Could it be the drive belt rubbing a casing ?
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« Reply #10 on: July 08, 2017, 07:06:52 »

I'm starting to think you've got a bad tyre.
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« Reply #11 on: July 09, 2017, 17:46:23 »

Do you know what I'm thinking it's something vibrating. You've got the 500 haven't you? Which according to reviews is "rougher" than the 350 / 125.

Could just be a loose panel vibrating, or something like that. Check also the number plate. If like (both!) mine there are only two screws at the top, the bottom edge is free to vibrate; my blue X10's plate had cracks in it. I drilled it for two extra screws at the bottom, and I had to do the exact same thing for the white scoot! It's not like plastic number plate screws are expensive or anything! 


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chippyzip
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« Reply #12 on: July 10, 2017, 17:41:02 »

Cheers Mike, I'll go over the scoot and check for tightness of the panel parts - I'm wondering if there's something a little loose around the front end, but I'll check all round.

Graham 
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« Reply #13 on: July 11, 2017, 09:59:47 »

Hi all

I've got City Grips on my 350, no undo noises if anything they're quieter on poor road surfaces.  I've always had Mich fitted to most of my bikes and never had any issues, in my humble opinion they're the best motorcycle tyres out there.

Vibration can cause all sorts of odd noises, example Yamaha FZS 600's had very similar noise which was due to the front indicators vibrating in the firing mounts, some did it from new the rubber mount was just slightly too loose a little silicon solved that.   Have a good check around the whole bike for something loose or ill fitting, could even be a broken spring clip mount and you know how these things get broken pulling the bodywork off          
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dado099
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« Reply #14 on: July 11, 2017, 14:00:20 »

My 350 does almost the same sound at that speed.
I think it did after rear tire exchange (new michelin city grip)
Don't know the reason, also because my tire specialist always did great jobs in previous exchanges
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chippyzip
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« Reply #15 on: July 12, 2017, 19:03:11 »

Yeah, I noticed the sound when the front and rear tyres were fitted. I'll take the scoot back to the fitter to see if it needs balacing- I'm sure it's fine, but I need to check just in case.. Thinking about it, just before I had the tyres changed, I did drop the scoot- I wonder if the noise is related to that? Maybe a panel has popped out, and creates that noise at speed?? mmm...

Graham 
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dado099
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« Reply #16 on: July 13, 2017, 10:58:42 »

Very curious,
also my scooter fell from stopped position, but a lot before tire exchange.
I had to replace a lateral fender and I found a broken rear panel support (near the exhaust),
which I didn't replace (whole panel is very expensive).
I don't remember if noise was starting from that episod.
Another thing I feel is that the noise is slowly reducing the more milage I run....
I'm puzzled 
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dado099
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« Reply #17 on: September 27, 2017, 16:15:27 »

Mistery solved.
The problem is in the muffler (too heavy?).
I replaced it with this:
https://www.banggood.com/36-51mm-Universal-Motorcycle-Black-Carbonfiber-Exhaust-Muffler-Pipe-w-DB-Killer-p-1104574.html
and the howling sound went totally away.  Clap

I think bad Piaggio engineering, they didn't calculate the big resonance on the rear swing arm with that huge muffler.

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dado099
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« Reply #18 on: September 27, 2017, 16:30:58 »

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Mr.Chips
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« Reply #19 on: September 27, 2017, 18:28:39 »

 

 
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Mike.
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chippyzip
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« Reply #20 on: September 30, 2017, 09:49:14 »

Mistery solved.
The problem is in the muffler (too heavy?).
I replaced it with this:
https://www.banggood.com/36-51mm-Universal-Motorcycle-Black-Carbonfiber-Exhaust-Muffler-Pipe-w-DB-Killer-p-1104574.html
and the howling sound went totally away.  Clap


I think bad Piaggio engineering, they didn't calculate the big resonance on the rear swing arm with that huge muffler.




What engine size was the muffler for?

Graham :-)
« Last Edit: October 01, 2017, 16:04:05 by chippyzip » Logged

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« Reply #21 on: October 01, 2017, 12:34:14 »

Mistery solved.
The problem is in the muffler (too heavy?).
Maybe it has a fault? Anything rattling around inside?

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dado099
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« Reply #22 on: October 12, 2017, 11:32:55 »

Hi Mike,
the original muffler is OK, no rattling inside.
I think it is a frequency resonance problem.





Hi Graham,
the original was specific for X10 350, the chineese one is declared as "universal" but I think  not to exceed 500-600cc because of its small size.
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chippyzip
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« Reply #23 on: October 12, 2017, 17:51:50 »

Hi Graham,
the original was specific for X10 350, the chineese one is declared as "universal" but I think  not to exceed 500-600cc because of its small size.
[/quote]

Cheers for that, I still think the noise could come from the tyres though.. The X10 is getting used less and less now, now that the days are getting shorter- soon time to lay her up over the winter period, time to dig out the battery trickle charger!
Graham ;-)
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