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Author Topic: tank slappers at 40mph  (Read 2041 times)

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#10

Offline aljaxon

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Re: tank slappers at 40mph
Reply #10 on: 18 Jul 21, 02:14:21
below is  a pic of front tyre
tyre at red cross is LOWER than tyre at blue cross.
had this before and i think its down to my usual heavy braking entering into corners. right up to the apex sometimes if i get it wrong. ive tried not to but i just do it without thinking most of the time.

as others have said uneven tyre wear i reckon this might be the problem


tyre x by alan jackson, on Flickr
Last Edit: 18 Jul 21, 02:22:19 by aljaxon
Z1000SX 2018   ZX9R 1998    RD350A 1974
PUCH M50 SPORTS  MOBYLETTE 50V 1974 
PALOMA D.A.S.L 1960

#11

Offline KD

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Re: tank slappers at 40mph
Reply #11 on: 18 Jul 21, 03:21:51
Change the tyres, Thats a good start..  :028: Now-a-days you don't get the 2 rear to 1 front anymore.

Now .. Put a cable tie (Ty-wrap) around your front right fork stanchion and it push up to the fork seal. Next time you ride , see how far your front dives under braking. if your close to 1cm from the bottom, You will find you need more preload at the front as well as with rebound and compression adjustments ..

Same for the rear .. As the SX is a Sports/Tourer (and not a Sports bike) You should do a sag check with you on the bike and then with you and your misses on the bike and try to get to the max sag setting of 40mm. Anything above that and its sagging too much and you need a stiffer spring.

The standard spring on the SX is 95N. I replaced mine with a K-Tech 110N spring.
Last Edit: 18 Jul 21, 03:28:15 by KD
Regards David.

2018 Kawasaki Z1000SX WJF.
2018 Triumph Tiger 1200 XRT.

#12

Offline ZPETE

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Re: tank slappers at 40mph
Reply #12 on: 18 Jul 21, 04:19:49
Sorry to disagree Aljaxon, please dont think I was having a go at you, just pulling your leg  :008: and I hear everything you say, but I have seen some horrific skin injuries and personally, nothing would ever get me out on my bike in shorts and t shirt however tempting it may seem. If it wasnt a legal requirement, would you ever ride without a helmet? :087:
Anyway, back on topic, been out on mine just now and tried no hands at various speeds and my 2015 didnt falter at all. I think new rubber and suspension set up would sort this out.
Ride safe  :464:

#13

Offline KD

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Re: tank slappers at 40mph
Reply #13 on: 18 Jul 21, 04:35:28
Here are the gallery pictures after changing out the spring on my 2018 SX and the spring specs I fitted.



Last Edit: 18 Jul 21, 04:38:14 by KD
Regards David.

2018 Kawasaki Z1000SX WJF.
2018 Triumph Tiger 1200 XRT.

#14

Offline ed

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Re: tank slappers at 40mph
Reply #14 on: 18 Jul 21, 06:11:28
*Originally Posted by aljaxon [+]
right everyone READ THIS!!!

FORGET PILLION FORGET PRELOAD FORGET EVERYTHING IVE SAID SO FAR.

the bike when ridden SOLO does the bar waggling
OK, I understand and thanks for sharing the video. You’re not kidding - that’s an odd and unsettling oscillation!
Looks like you need new tyres soon anyway, so I hope that fixes things? Good luck and it’ll be interesting to find out how you fix this and whether anyone else has had similar experience.

#15

Offline aljaxon

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Re: tank slappers at 40mph
Reply #15 on: 18 Jul 21, 08:00:25
yeah thanks for the advice chaps
especially setting the correct sag KD.   :464:

its something ive always meant to do on all my bikes but never got round to it. i usually just have a tweak and a fiddle and then settle for something that doesnt unseat me or lose traction while cornering.


 like i say im a bit of a luddite with suspension, ill settle for anything.  i take my 1974 rd350A round bends over the ton with 10p pieces to stiffen up preload so anything is perfection in relation to that. im probably the least fussiest re suspension requirements on this planet. but i admit i dont like the oscillating bars and will now try to set the suspension up.

now that im aware it waggles, when riding the sx holding the bars i can feel a microscopic oscillation but maybe only because im looking for it.
 if i'd not removed my hands i'd never have known.

good to know its not a thing ZPETE and yours doesnt waggle.

re protective gear - i was literally only going for a nip up and down the street in my shorts and t shirt and couldnt be arsed to put all my gear on in this heat.
if id have been riding any further....
 i'd have gone naked........

i often ride the bike round to the back of my house in boxers bare feet and no helmet. a 50 yard trip.

i used to suffer badly with psoriasis and was covered head to toe like the guy in the singing detective and spent weeks in hospital with weeping skin blisters and open sores so i know more than most how painful having no top layer of skin is. daft really riding knees exposed i agree. mad thing is i always wear gloves and a helmet the oidd few trips i do on the road in shorts. like half a mile to my lads house etc. hands that do dishes an all that.

the tyres on the bike were on it when i bought it. avon storm or summat.

i'm wondering for my  tyre purchase  out and out sports bike tyres- ie corsa's  or touring tyres/sports touring?
i know tyres are a personal thing just like politics and most views are subjective but will have a look on here to see what people use.






Last Edit: 18 Jul 21, 08:04:19 by aljaxon
Z1000SX 2018   ZX9R 1998    RD350A 1974
PUCH M50 SPORTS  MOBYLETTE 50V 1974 
PALOMA D.A.S.L 1960

#16

Offline whyhaveone

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Re: tank slappers at 40mph
Reply #16 on: 19 Jul 21, 12:19:00
Don't forget to use the correct pressure figures - 36 / 42. The SX is sensitive to tyre pressures.  :002:
Kawasaki: 1975 250-S1C; 1977 Z650-B1; 1980 Z1000 MKII A3; 2011 ER6n; 2013 Z1000SX ABS; 2016 Z1000SX ABS Tourer, 2020 Ninja 1000SX Performance Tourer.

#17

Offline Hiswitsend

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Re: tank slappers at 40mph
Reply #17 on: 19 Jul 21, 07:33:32
Could be that one of the wheel is slightly out of balance, might explain the odd tyre wear as well

#18

Offline sooty66

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Re: tank slappers at 40mph
Reply #18 on: 19 Jul 21, 10:39:58
Had the same thing on my 18 plate with old tyres on,went away when I changed them
Once you've had black,you'll never look back

#19

Offline Paul1967

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Re: tank slappers at 40mph
Reply #19 on: 19 Jul 21, 03:45:43
My 2020s handling went to rat sh... towards then end of the tyre life. Front tyre wore a pronounced flat spot on the right shoulder as well as on the centre line. I set the suspension up properly for my weight etc from new. Changed the tyres out and now handling etc is perfect again as you should expect with new rubber anyway but certainly tyre wear can really detrimentally affect the handling. I've had bikes that aren't affected at all as tyres wear and some like my sx that is.