K3 front end

[glang]

Originally Posted by Fazer Fail

Rip it all out start again then I guess

Have you had a good read through the info on Racetech site for emulators? Its got diagrams of the oil flow under both low and high speed compression which all make perfect sense....

[glang]

Originally Posted by GeorgeRYoung

The pic shows a used damper rod with 4 holes. The scratches indicate how close the one-way valve comes to the existing holes. If additional holes are drilled, the one-way valve crosses them near full travel, and compression damping drops from high to nil.

With the stiffer springs this should be much more unlikely...

[glang]

My Racetech emulators each came with two springs of different strengths so giving a bigger range of possible valve opening forces...

[Fazer Fail]

Cheers for the advice I will have a go at the weekend when I have time going to try thinner silkolone oil will get some 5w and 7.5w plus the 15w that in has done less than 5 miles so happy to keep it this week give me a variety of options to play with.
Bibio thanks for the advice yes that is similar to what I use always bike sag too set up then as you say rider is governed by spring rate. Currently it's way too stiff on compression and tad too much on rebound ie no bounce just returns which as you say is too slow.
I am content that the extra weight of springs plus still having the hydraulic lock out cups fitted will not present an issue with the extra holes as I much heavier than my son I will ride it when I get the oil weight right if I can't bottom it out no way he will.

On the plus side the effect of the emulators was felt even if the low speed compression was rock hard he reported that speed bumps were dispatched with ease and did not jolt him out the saddle. This to my mind demonstrates the valve opened as it should yes when i change oil weight I may need to readjust it.
Can predict a trade off between low speed compression and rebound ie too thin an oil the rebound will suffer and vice versa.

Still a bit annoying that the, YSS instructions did not highlight this issue and I have great respect for mad8vcycles who also created 2 extra holes as I did. The size would seem to be irrelevant as simply put the damping rod will be ineffective and compression damping will be governed by the emulators low speed via the small hole near the middle ie fixed then higher speed and pressure the valve lifts when the spring is overcome as long as this creates less flow than the damper rod holes then it will control fast rebound, if the damper rod holes are not big enough it will still restrict flow and reduce the effectiveness of the emulators. Rebound is where I fail to understand as many say emulators have no effect on rebound? I accept that they can't alter the rebound speed it's set, but if as in my case the small hole at the top of the damper rod is welded shut would this not in effect mean the small hole in the emulator that handled low speed compression not also handle rebound as this is just a hole not a one way valve the popper valve that handles high speed compress will not operate at it is a one way valve. To this end the emulator dictates rebound in so much as the hole dictates flow?
That my understanding from my reading at lest and of course correct me if wrong .

The emulators are YSS make as far as I know they only come with one spring for the flap valve not like RT. So less adjustment BUT the issue I was having was low speed compress and rebound the spring would have no effect on this as should not open for low speed compression or rebound as understand it. This has simply been an oil weight issue I have proved that by removing the emulators leaving BIG holes in the damper rod but the small upper welded shut the effect the suspension moves freely and does not feel under damped such is the thickness of the oil.

Apologies for an abrupt reply was having a really **** night on work trip and was rather snappy after having to pay for hotel as work card failed.

[Bibio]

Keep the heavy oil in then remove xxml using a large syringe then add some 5wt of same amount, test and repeat till you get somewhere that works. Keep a log of the amounts. Remember and give the oil time to mix during ride test.

[glang]

According to Racetech you use the oil viscosity to adjust rebound and only when that is correct you set the emulator spring to get correct compression. You want as thin an oil as possible (the sealed rebound hole will help) so that low speed compression will be good and then set the spring for high speed. I believe a thin oil is also more temperature stable...

[Fazer Fail]

Agree oil viscosity adjusts rebound, but the emulator spring is only overcome in high to medium speed compression, therefor low speed compression is not affected by the emulator spring rate, RT tuning guides states tuning of low speed compression is done by the valve plate bleed holes, in effect if you want a less harsh or softer low speed compression open up more than 1 hole.
I would argue that oil viscosity is an easier and less permanent means of tuning low speed damping providing it does not adversely affect rebound damping, if this is the case and thicker oil is needed the following RT guidance more bleed holes should opened up.

https://racetech.com/emulator-tuning-guide/

[glang]

Hopefully you can get the rebound correct with quite a thin oil especially the original rebound holes are closed and then SS compression will also be improved. Only one way to find out...

[Bibio]

Oil viscosity effects compression and rebound.

[glang]

Yes its a compromise but at least fast speed compression is largely a separate adjustment with emulators....