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knocking sound from take off I_icon_minitimeby GHM-PM Today at 7:39 am

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 knocking sound from take off

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acworthpatrick
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cjuzda
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PostSubject: knocking sound from take off   knocking sound from take off I_icon_minitimeWed Jun 01, 2011 5:32 pm

2006 Silver Wing with 2000 km's bought used. I've noticed knocking noise coming from the left rear of the bike on take off from a stop. Only lasts for a couple of seconds and stops as soon as I get moving a few feet. I don't notice it otherwise even at really slow speeds (<10 kph). is this normal, is it more likely to be the variator than the engine
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buddy19520
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PostSubject: Re: knocking sound from take off   knocking sound from take off I_icon_minitimeThu Jun 02, 2011 11:19 am

The Silverwing usually makes a rumbling noise upon take-off. If you take off slowly, you will also build up a squealing noise from the belt and clutch. Hard take-offs help prevent this (and are a lot more fun).

The rumbling can be stopped by using lighter variator weights, Dr Pulley sliders or a aftermarket variator (which usually has lighter weights).

Most Silverwings are pretty trouble-free. The chance that you got a lemon is pretty small. Relax and ride.
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acworthpatrick
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PostSubject: Re: knocking sound from take off   knocking sound from take off I_icon_minitimeFri Jun 03, 2011 7:17 am

Curious here as I am having the same issue, what will lighter weights to the top end performance of the bike? And is the noise really hurting anything?
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MaxB
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PostSubject: Re: knocking sound from take off   knocking sound from take off I_icon_minitimeFri Jun 03, 2011 8:32 am

Probably the belt hitting the aluminum case, due to slack between pulleys.
It happens on some scoots and not others.
To verify if this is the problem , open the case and look for rubbing on the lower case.

It won't hurt just annoying.
As the scoot gets mopre miles on it , it will dissipate somewhat.

Mine went away with the J Costa variator, others use slider weights, the stock weight is 28 grams. I will let others tell of experience with lighter weights.

MaxB
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Waspie
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PostSubject: Re: knocking sound from take off   knocking sound from take off I_icon_minitimeFri Jun 03, 2011 10:31 am

Totally misled by the title!!!! Laughing Damm!!!

I was going to be smart and say it will be the undercarriage retracting into the fuselage.

You don't have retractable out riggers on your 'Wing' perchance? Twisted Evil
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honda_silver
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PostSubject: Re: knocking sound from take off   knocking sound from take off I_icon_minitimeFri Jun 03, 2011 1:32 pm

MaxB wrote:
Probably the belt hitting the aluminum case, due to slack between pulleys.

If it is the belt slapping, then take off the aluminum case and clean the top and bottom near the front pulley and apply some silicone (or similar) type spray ... it may help to reduce the slap.
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bigbird
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PostSubject: Re: knocking sound from take off   knocking sound from take off I_icon_minitimeFri Jun 03, 2011 2:52 pm

x


Last edited by bigbird on Sat Jun 09, 2012 12:52 pm; edited 1 time in total
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honda_silver
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PostSubject: Re: knocking sound from take off   knocking sound from take off I_icon_minitimeFri Jun 03, 2011 3:43 pm

bigbird wrote:
I'd think twice about putting any silicone spray anywhere near the belt or pulleys. The CVT relies on the friction between the belt and the pulleys to engage.

As I recall the belt slap marks are on the outside aluminum casing which can be moved far away from the belt and pulleys and sprayed.

I have 34,000 miles on my non-OEM belt, so I will be replacing the belt. I will recheck the position of the belt slap marks.
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bigbird
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PostSubject: Re: knocking sound from take off   knocking sound from take off I_icon_minitimeFri Jun 03, 2011 5:04 pm

x


Last edited by bigbird on Sat Jun 09, 2012 12:52 pm; edited 1 time in total
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honda_silver
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PostSubject: Re: knocking sound from take off   knocking sound from take off I_icon_minitimeFri Jun 03, 2011 6:23 pm

bigbird wrote:
honda_silver wrote:
As I recall the belt slap marks are on the outside aluminum casing which can be moved far away from the belt and pulleys and sprayed.

If the belt is slapping the casing and there's silicone on the casing, will silicone not be transferred to the belt?

People have been applying silicone spray to Dr Pulley sliders with no problems ... including me. After it dries you can wipe and there was no residue left.
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bigbird
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knocking sound from take off Empty
PostSubject: Re: knocking sound from take off   knocking sound from take off I_icon_minitimeFri Jun 03, 2011 6:30 pm

x


Last edited by bigbird on Sat Jun 09, 2012 12:53 pm; edited 1 time in total
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cjuzda
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PostSubject: Re: knocking sound from take off   knocking sound from take off I_icon_minitimeFri Jun 03, 2011 10:00 pm

Thanks for all the input. I'm certainly not panicked about this. It seems to occur when the SW has warmed up a bit. Definiteley a hollow knocking sound only at the slowest speeds for a second or 2 while taking off from a standing start. When I have time, I'll remove the case cover and take a look.

Chris
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