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Post by JonW on Apr 29, 2017 10:07:05 GMT 1
Ive been looking for an 1985 fork leg damper rod... Ive started a thread in the Wanted forum about it. rdlccrazy.proboards.com/thread/39803/f1-fork-damper-rod-similarIts the tube like thing down the bottom of the forks and I need it as a machinist overcut one of the ones for my forks when doing the conversion to valves. :/ When looking at the parts numbers I can see that the later (86-on) N/F2 versions are a little different being a 1UA part number, not 51L, but the rest is the same (the middle number being the one for fork dampers of course). My question is, how different are these two parts actually? Obviously. it could widen the scope of my search if I could use the later parts I think since Im having the holes brazed up and recut anyway. Ie. if the rest of the dimensions are physically the same (I mean they are the same forks otherwise, right?), then I don’t need to be so prescriptive in the part Im looking for... Anyone know the details on these? |
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Post by midlifecrisisrd on Apr 29, 2017 10:53:12 GMT 1
I thought they were all the same dimensions
You can interchange all the stanchions so don't see why they are not the same other than the hole specs
Strangely I have just stripped an lc2 set and found 20mm spacers on top of the spring and the damper tubes have been polished
Never taken any notice before but how many small holes should be drilled in them?
Suspect they have been modified
Steve
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Post by midlifecrisisrd on Apr 29, 2017 11:03:35 GMT 1
Unless the fork travel was different
That would make them different lengths
Steve
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Post by JonW on Apr 29, 2017 13:24:20 GMT 1
I thought the LC2 forks were different, more like the LCs than the later ones? I can check that tho, I have spare LC dampers so it would be good if they were similar, hmm.... The holes dont matter to me, they get brazed up for what I want to do  Dunno why polishing the dampers would help really, but people used to fit spacers (wheel nuts was often said to be good) to provide some preload. |
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Post by JonW on Apr 29, 2017 13:34:07 GMT 1
Ok, just been out to the garage. The LC damper rod is not the same as the F1 version, its much thinner.  |
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Post by midlifecrisisrd on Apr 29, 2017 15:24:38 GMT 1
I thought the LC2 forks were different, more like the LCs than the later ones? I can check that tho, I have spare LC dampers so it would be good if they were similar, hmm.... The holes dont matter to me, they get brazed up for what I want to do Dunno why polishing the dampers would help really, but people used to fit spacers (wheel nuts was often said to be good) to provide some preload. I suspect the polishing is where they have been welded up then dressed Steve |
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Post by bare on Apr 29, 2017 23:14:47 GMT 1
Why ? the brazing up of Holes? Goofy Racetech instructions possibly??
YSS instructions require No brazing in of holes only the drilling of larger and More lower holes.
In.. Real life.. the Yss valves work exactly the same as Racetech ones :-) Some wierdness inherent in that it would seem.
Despite all that.. Valves only alter/affect Compression Damping.
Rebound.. THE.. important one, is dependent /controlled by the Oils' centistroke (viscosity ain't the same thing)ratings.
Just saying :-)
Preload is basically to help Fat b*****ds from squashing the pore bike flat to it's bump stops.
Does nothing for handling, and Certainly not for spring rate as it's unaffected by preloadings.
Cutting Coils and complete spring replacement alters Spring rate.
Bits of PVC pipe can be fitted as spacers to compensate for removed coils.. cheap, easy and durable.
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Post by JonW on Apr 30, 2017 0:15:23 GMT 1
Thats all good info, but.... Im doing it the way that has been told to me by someone who had a good experience with a method of fitting the valves, different to both of those methods actually... but thats not really relevant to this discussion, Im just trying to work out if these are the same for what i want as I need to find one.
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Post by midlifecrisisrd on Apr 30, 2017 9:30:48 GMT 1
Why ? the brazing up of Holes? Goofy Racetech instructions possibly?? YSS instructions require No brazing in of holes only the drilling of larger and More lower holes. In.. Real life.. the Yss valves work exactly the same as Racetech ones :-) Some wierdness inherent in that it would seem. Despite all that.. Valves only alter/affect Compression Damping. Rebound.. THE.. important one, is dependent /controlled by the Oils' centistroke (viscosity ain't the same thing)ratings. Just saying :-) Preload is basically to help Fat b*****ds from squashing the pore bike flat to it's bump stops. Does nothing for handling, and Certainly not for spring rate as it's unaffected by preloadings. Cutting Coils and complete spring replacement alters Spring rate. Bits of PVC pipe can be fitted as spacers to compensate for removed coils.. cheap, easy and durable. I'm considering coil cutting but the question is how much to cut off Steve |
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Post by bare on May 2, 2017 18:32:57 GMT 1
4 coils on Mine.. Cut ends ground flattened to mimic the oem spring end.
Considerably stiffer/ improved from oem/before.
But Likely not enough for Serious handling, although I'm happy enough to not bother further
I cut and fitted PVC pipes as compensating spacers
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mboddy
Weekend rider
Posts: 58
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Post by mboddy on May 4, 2017 23:32:45 GMT 1
Why ? the brazing up of Holes? Goofy Racetech instructions possibly?? YSS instructions require No brazing in of holes only the drilling of larger and More lower holes. Smaller holes allow lighter oil which gives less cavitation. |
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Post by JonW on May 5, 2017 0:42:24 GMT 1
Why ? the brazing up of Holes? Goofy Racetech instructions possibly?? YSS instructions require No brazing in of holes only the drilling of larger and More lower holes. Smaller holes allow lighter oil which gives less cavitation. Mark I am using your sketch for the work on my forks, thanks again for that mate. |
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Post by bare on May 5, 2017 5:59:40 GMT 1
Interesting theory. Could you explain the logic of it then? You might be onto something.. Or not.
IMO Cavitation is a Moto X shocker phenomena. NOT normally found in a geriatric Yama 350 which is erm.. unsuitable machinery (and V often rider) for off road racing.
That said Lighter oils are problematic in these fork designs.. Where Rebound, THE most important shocker function, is down to oil viscosity. Higher CTS rating = Good.
That said Viscosity and CTS are not a direct correlation either.
Then the logic to reduced oil flow orifices is arguable/ supportable.. perhaps. I'm Not giving the theory much credence sans definitive proof though
Then there is the small factoid that YSS regards those oem holes as adequate to needs. Could they actually know what they are doing?
Noting that YSS is evolving into a capable /decent shocker firm... they can't be Komplete bunglers
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