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Enduro Suspension Tuning & maintenance of Enduro forks, shocks, etc |
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#301
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Yes. a higher PFP pressure will add to the force that will try to extend the forks. I have not done so, but it could be easily tested when assembling the cartridge. When compressing it by hand, it extends at a certain speed. If you wind the PFP in, not changing anything else, I would expect it to extend faster. Under these circumstances, no cavitation should be present.
But in the real world when riding, if GMP's thesis is correct, a certain amount of cavitation will be present, and that amount can be controlled by the cartridge pressure via the PFP. Trying to understand suspension behaviour is an interesting topic, I must say! Does that make me a geek? In any case, I can live with that BTW, I tested my new setup today. It has been raining a lot lately, so the track was difficult to ride with a lot of new baseball to soccer ball sized rocks emerging. I couldn’t really compare to last Wednesday's ride (when it was hot and dry) but I think my rebound has got a bit slower. I rode at 10 and later 8 clicks today, and that could be compared to around zero clicks with the old settings I think. I also tried to soften the compression a bit by removing a face shim, but I am uncertain whether it really made any difference. Perhaps I need to soften the midvalve slightly? However, I got a comment from a friend that watched us riding up a rocky hill: "I saw that your forks worked very well and followed the terrain better than the others (that are on orange machines most of them). I guess that is a compliment to the Marzocchis, and that I am getting close.
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Anders "So you know, that you're over the hill when your mind makes a promise that your body can't fill" (Little Feat: Old Folks Boogie) 2015 EC200 Racing: TE bars, Rekluse Core Exp 3.0, 38mm Lectron & Ohlins S3 steering damper 2006 EC200: 2011 plastics, Rekluse Z-Start, revalved KYB forks & Scotts steering damper 1998 Bimota Supermono 1986 Duc Mille S2 1975 Guzzi sidecar hack 1961 Morini Corsaro 125 etc |
#302
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Remember the mid valve sees a lot more oil flowing through it than the base valve does, and as such any changes at the mid are much more pronounced.
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#303
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Quote:
It has been a long battle sorting my forks out so hope this a help to you..a local tuner had been in mine and basically Put valves in upside down and shims in different order in each leg. I'm lucky enough to have a good mate who owns a bike garage who has been great help in sorting this out and getting hold of the information needed I took out 1 x 32 x 0.15 and 2 x 11 x 20 in the cartridge compression stack. cartridge air gap as manual (had some knocking first time so dipped valve in oil to remove air) 300cc in outer chamber pfp at 1.5 rebound 16 compression 15 new bushes and fork seals and internally new seals on damping rods as one was leaking all the oil out of the cartridge. my cartridge spring is 3.9mm (2012 racing) we have measured the spring in a 2017 is 3.5mm.. I'm guessing this has been altered to soften things up ? have put in silkolene rsf 7.5 .. http://www.silkolene.com/motorcycle/...luids/rsf-7-5/ Herdy Last edited by Herdy; 08-04-2016 at 01:51 PM. |
#304
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Some one do a video of servicing those forks? Seams to be a bit complicated,not like OC.
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#305
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EC250 2019 |
#306
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www.endurohp.eng.br Sherco ST300 2015 (Trials) https://www.instagram.com/leocm74/ Brasil! |
#307
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So I have read through this entire thread to the best of my ability. In my defense I'm under the weather....regardless, what bushings are you guys using? Is the consensus to use the Yamaha KYB units? Or was the fitment wonky? What is the part number/manuf for the bushings you guys are using?
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#308
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Quote:
__________________
Anders "So you know, that you're over the hill when your mind makes a promise that your body can't fill" (Little Feat: Old Folks Boogie) 2015 EC200 Racing: TE bars, Rekluse Core Exp 3.0, 38mm Lectron & Ohlins S3 steering damper 2006 EC200: 2011 plastics, Rekluse Z-Start, revalved KYB forks & Scotts steering damper 1998 Bimota Supermono 1986 Duc Mille S2 1975 Guzzi sidecar hack 1961 Morini Corsaro 125 etc |
#309
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Awesome thread! I serviced my forks over the weekend and before starting the job I was quite afraid to be honest (after reading all the stories about bleeding, having to use straps etc). I printed out the posts made by GMP and Simmo737 and it was VERY HELPFUL. I poured in 210cc of KYB fork oil (was told by our Estonian dealer that it's the best to use) and let it settle for 20-30 mins, corrected the oil height to 140mm, raised the rod and inserted compression (shook it around a bit when comp stack was in oil to get air out) unit while lowering the rod. I didn't have to push hard to get threads started so this was the first win. I tried to push the damping rod up as quickly as I could with hands, but didn't hear any air escaping, so I took it out of vice and pushed on table about 10 times. There was only a small rain drop amount of oil coming from the bleed holes. Slowly cycled the damping rod, didn't hear any bubbles, turned it upside down and *slurp-slurp*... oh well, some air is still in that I wasn't able to get out. So with the second fork I decided to try and use oil level of 130mm from top. Didn't still have any difficulties inserting the comp unit, but now I got a fart out of it when cycling only by had. One more burp when compressing on the table and a few drops of oil came from the bleed holes. When turned upside down, I still hear some air in there but definitely a lot less than the other fork had. So I opened the other one and also topped it to 130mm. Seems to be good enough
However, the bushings on the comp unit are bad, they have some worn out places. My dealer told me that it's impossible to get new ones so now I'm looking if someone can coat them for $$$. |
#310
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I don't know your location, but I would try other sources.
LT Racing in the Seattle, Washington area. http://ltracing.com/ Works Enduro Rider in New Jersey. http://werproducts.net/ In my 18 year association with these two suspension tuners, they've always had or come up with the parts I need. Good Riding and Wrenching to You! Jim .
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Jim Cook Smackover Racing Team LAGNAF '11 Gas Gas EC250 (primary ride) '06 Gas Gas DE300 2004 Gas Gas TXT300 Pro '94 Husaberg FE350 '86 Yamaha IT200 '86 Honda TRL200 Reflex '04 KTM 525EXC (soon to be dual sported) Several others, including project bikes, Deb's bike, and a fleet of grandkids' bikes Let's go riding! http://www.jebruns.com/Wudi19/wudi19.html http://www.ahrma.org/schedules-results/cross-country/ |
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