front end shimmying - SV650.org

Bibio · 26-09-08, 11:20 PM

had some avon storms fitted today, although the grip is great i have noticed that the front end gives a little shimming at 80mph and above (on a private road) and at about 10mph as well.

anyone any ideas?

pmapp · 27-09-08, 07:42 AM

Do you mean it vibrates?

Did they get balanced when they were fitted?

Bibio · 27-09-08, 12:59 PM

nope its not a vibration, yes they got balanced when fitted.

the front end is shaking its head and gets worse the faster above 80mph i do.

also below 10mph, i'd swear that the tyre wasn't balanced but i watched him do it.

Bibio · 27-09-08, 04:48 PM

just to add, i upped the pressure in the front tyre to 34psi and it seems a lot better, then i upped the compression dampening and took it out again, it seems to have solved the problem, until that is i start to decelerate and at around 80, it feels as though the front wheel wants to tuck under.

any suggestions?

yorkie_chris · 27-09-08, 04:49 PM

What bike?

Bibio · 27-09-08, 04:56 PM

ahhh, emmm, well its an sv650 with a gsxr1000 k2 front end and a gsxr1000 k7 rear shokky.

yorkie_chris · 27-09-08, 04:57 PM

Get front end off floor and spin wheel, check bearings and headstock. Also check spindle is tight, would allow side to side play.

Bibio · 27-09-08, 05:02 PM

everything is tight and sorted no freeplay whatsoever.

only thing i have changed from the old tyres (dunlops) is the front is now a 60 profile rather than the 70 for the gsxr.

yorkie_chris · 27-09-08, 05:05 PM

60 profile works fine, I've got that on my gixxer front end.

Bibio · 27-09-08, 05:47 PM

that's what worries me, the bike was not doing it before the tyre change.

i've eliminated the shaking its just the front feels as though its 'white lining' on declaration that's worrying me.

26-09-08, 11:20 PM	#1
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	front end shimmying had some avon storms fitted today, although the grip is great i have noticed that the front end gives a little shimming at 80mph and above (on a private road) and at about 10mph as well. anyone any ideas?

27-09-08, 07:42 AM	#2
pmapp Member Mega Poster Join Date: Jun 2006 Location: Wakefield, West Yorks' Posts: 1,129	Re: front end shimmying Do you mean it vibrates? Did they get balanced when they were fitted? __________________ '52 Curvy S \| So good.....it made me want to trump! If at first you don't succeed - use more gaffa tape.

27-09-08, 12:59 PM	#3
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: front end shimmying nope its not a vibration, yes they got balanced when fitted. the front end is shaking its head and gets worse the faster above 80mph i do. also below 10mph, i'd swear that the tyre wasn't balanced but i watched him do it.

27-09-08, 04:48 PM	#4
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: front end shimmying just to add, i upped the pressure in the front tyre to 34psi and it seems a lot better, then i upped the compression dampening and took it out again, it seems to have solved the problem, until that is i start to decelerate and at around 80, it feels as though the front wheel wants to tuck under. any suggestions?

27-09-08, 04:49 PM	#5
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: front end shimmying What bike? __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

27-09-08, 04:56 PM	#6
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: front end shimmying ahhh, emmm, well its an sv650 with a gsxr1000 k2 front end and a gsxr1000 k7 rear shokky.

27-09-08, 04:57 PM	#7
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: front end shimmying Get front end off floor and spin wheel, check bearings and headstock. Also check spindle is tight, would allow side to side play. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

27-09-08, 05:02 PM	#8
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: front end shimmying everything is tight and sorted no freeplay whatsoever. only thing i have changed from the old tyres (dunlops) is the front is now a 60 profile rather than the 70 for the gsxr.

27-09-08, 05:05 PM	#9
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: front end shimmying 60 profile works fine, I've got that on my gixxer front end. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

27-09-08, 05:47 PM	#10
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: front end shimmying that's what worries me, the bike was not doing it before the tyre change. i've eliminated the shaking its just the front feels as though its 'white lining' on declaration that's worrying me.

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