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20-01-2024, 04:06 PM | #1 |
Old Git
Join Date: May 2006
Location: Cricklade
Bike: Multiple Monsters
Posts: 2,897
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S4 Ohlins SD154 problem
i have obtained an ohlins SD154 steering damper kit for S4/S4R monster but there is no way it fits the frame to forks as its stoke is 140mm its not long enough ?????????? i reckon it would need a 170mm stroke to be able to turn the handlebar ???
im perplexed ... I want it or an alternative as S4 always headshakes at speeds above 120mph and everything is spot on .
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MONSTERMAN |
20-01-2024, 05:29 PM | #2 |
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Join Date: Jul 2003
Location: East London
Bike: Multiple Monsters
Posts: 9,733
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are you sure it’s an SD154 (side mount) and not the more usual sideways on the top yoke jobbie?
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21-01-2024, 11:22 AM | #3 |
Too much time on my hands member
Join Date: Jan 2013
Location: Shipbourne
Bike: M900
Posts: 1,422
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Jacking the rear suspension up about 5mm would help with the headshakes. With the dreadful design of handlebars on the S4 it is not possible to drop the yokes on the stanchions
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21-01-2024, 11:41 AM | #4 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,091
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This is a good thing to do on any of the early Monsters, they're too rear biased and with the S4 power can get a bit wild up front! I did that with my S4 Foggy and put clip ons so you can drop the forks too if needed but didn't find that necessary. Steering damper does help too.
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
21-01-2024, 06:57 PM | #5 |
Dismantled
Join Date: Feb 2006
Location: East Molesey
Bike: Multiple Monsters
Posts: 2,242
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"Political correctness is just intellectual colonialism and psychological fascism for the creation of thought crime" |
22-01-2024, 02:54 PM | #6 | |
Old Git
Join Date: May 2006
Location: Cricklade
Bike: Multiple Monsters
Posts: 2,897
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Quote:
bike still headshakes at 120mph and has always done that
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MONSTERMAN Last edited by jerry; 22-01-2024 at 02:56 PM.. |
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22-01-2024, 02:55 PM | #7 |
Old Git
Join Date: May 2006
Location: Cricklade
Bike: Multiple Monsters
Posts: 2,897
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its the side mount with all the correct fittings but it aint long enough for sure
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MONSTERMAN |
22-01-2024, 04:06 PM | #8 |
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Join Date: Jul 2003
Location: East London
Bike: Multiple Monsters
Posts: 9,733
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the spec on kato’s link says 140mm stroke, so that’s the fork leg moving nearly 3” back and the same forward lock to lock, in old money, which sounds close but about right
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22-01-2024, 08:39 PM | #9 |
Registered User
Join Date: Dec 2010
Location: Oslo
Bike: S2r
Posts: 448
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23-01-2024, 08:31 AM | #10 | |
Old Git
Join Date: May 2006
Location: Cricklade
Bike: Multiple Monsters
Posts: 2,897
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Quote:
I may try a top bar mounted one instead and send this one back to Ohlins
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MONSTERMAN |
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23-01-2024, 08:47 AM | #11 |
Dismantled
Join Date: Feb 2006
Location: East Molesey
Bike: Multiple Monsters
Posts: 2,242
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Open this link
https://www.ohlins.eu/en/products/mo.../sd-154--4521/ Scroll down to bottom of the page and there is the mounting instructions with spec and a full kit list and an owners manual
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"Political correctness is just intellectual colonialism and psychological fascism for the creation of thought crime" |
24-01-2024, 06:11 AM | #12 |
Old Git
Join Date: May 2006
Location: Cricklade
Bike: Multiple Monsters
Posts: 2,897
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Kato I have those instructions but its clear that the damper is too short , mounted as per intructions I cannot turn bars . i am gong back to Ohlins dealer to see what the issue is ,,he says I may need different unit ????
Im also looking at the DP one for sale on UK Monsters by John D but as I have modified yokes and bars it may not fit also heard a lot of negative about DP Gubbinelli kit ???? prefer Ohlins i have a lot of their stuff already shocks , fork internals etc on several bikes and the side mount unit will have no problems with change of bars and yoshimura triple tree.
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MONSTERMAN |
26-01-2024, 04:15 AM | #13 |
Old Git
Join Date: May 2006
Location: Cricklade
Bike: Multiple Monsters
Posts: 2,897
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Problem solved ,, the SD154 is not an SD154 its been wrongly marked at factory its only 110mm stroke,, my Ohlins dealer is a good bloke and he is shocked , when I took it back he measured it , I had just assumed it was correct but its only 110mm stroke ????? no wonder it does not work , he has refunded me as he does not have another in stock ,and he will chase up Ohlines about it ?????
So im looking again but he had an exceptional deal as it had been sitting on his shelf for a while and other suppliers are asking £400+ for similar dampers ,, I am tight on money right now so will be looking for a bargain over next few months as \i wont be back in Thailand until late October . But I really need a damper for the S4 its a must ,I have owned this bike 18 years and nothing has cured the headshakes above 120mph and believe me I have done everything you can think of
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MONSTERMAN |
26-01-2024, 09:13 AM | #14 |
Dismantled
Join Date: Feb 2006
Location: East Molesey
Bike: Multiple Monsters
Posts: 2,242
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Well clearly the cure for headshake is to stop at 119mph problem solved
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"Political correctness is just intellectual colonialism and psychological fascism for the creation of thought crime" |
26-01-2024, 09:57 AM | #15 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,963
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+1 for Kato's suggestion, or roll off even earlier than that.
In the late 70's early 80's I rode a lot of contemporary Bonnies and Tigers back to back. They would nearly all start a Dutch roll at exactly 98mph, not a shake or dangerous speed wobble as such, but with varying intensity depending on how quickly you got there, passenger present, road surface and so on. It would settle if you pushed through it. (But not much left @ 98 to be honest!) I noticed that the UK spec bikes with flat bars did not do this and attributed the phenomenon to aerodynamics. The US or export bars were quite high, so I think it was something to do with the wind rolling off one side or other of the torso alternatively. Much as a flag will flutter in the wind, or a loose jacket? In your case it might be something to do with a headlamp fairing or screen if you have one, or maybe a mirror on one side only? I imagine you already have lowish bars? Have you tried just bending your elbows and tucking in a bit when the wobble starts, or preferably just before?
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