#61
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I weigh 75kg and get these results with a 4.8 spring, which I replaced the stock 5.2 with. Remember, if your spring is too soft you will have less static sag than 25-30 for the race sag of 100-110, if your spring is too hard you will have more static sag for the race sag of 100-110. As a side note my sachs shock blew apart at 50 hrs - I noticed it get all sproingy then within minutes the circlip blew out of the body. It was repaired under warranty with a newly designed seal head and has been brilliant ever since - now about 250 hours.
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Barry 07 EC250 |
#62
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But, what we are discussing here is primarily how less preload provides a more comfortable ride. A bit more static sag will always provide a plusher ride in the initial part of the stroke than a spring that has been screwed down to be stiffer. The whole thing is a bit of a catch 22. The right spring will give you the right figures. You may be borderline where you can either run with more preload, or go up a rate and run less. In this case I'd go for less preload and a heavier spring. |
#63
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No dramas mate,
If you want to get rid of it let me know. I don't think they are that expensive anyway. As for the issue, yes I am in the catch 22 . I will test it how it is as I will be doing logs etc anyway. If it is crap I will get a new spring suited to my weight. Cheers Mark Quote:
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Xr 250 ( first bike) 98 Rmx 2007 Gas gas 300(swapped for trials bike) 2008 280 Raga replica 2012 Gas gas ec 300 E |
#64
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ok, with 25mm of preload....
30mm sag, 100mm race sag... i would assume that's about where it should be, but that's a bunch of preload. if i back the preload back to say 15 i would guess the numbers would still be close to where it should be, but then it just feels low in the back to me.
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07 ec300 was 00 xc200 now a 00 xc300. now parting out. 99 ec300 (now a pile of parts which are for sale) Stainless Cycle - Motorcycle Bolt Kits www.stainlesscycle.com |
#65
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Your spring must be wrong/bad. I just looked at mine, preloaded spring length on the bike is approx 250mm. Free length of a 5.2 I have on the shelf (both Sachs springs, same length) is 260mm, so it works out.
The original point of the thread was to NOT get hung up on the sag numbers, but tune the suspension by FEEL while limiting preload to 10mm. Preload does matter, and affects the feel of the initial travel. I think any tuner will agree that 25mm preload is off the map and something is wrong. As far as the shock itself, one original issue was the piston band being loose. Les would fix this by using a WP band with a different oring under it, then Sachs updated the part. I have had zero problems with my shock, but it has been to Les for updates, valving and service since new. Not everyone knows the details as well as him. Last time it was just the fluid that needed changing, rebound was creeping up and needed more clicks in. Fine now. I used 195 PSI nitrogen. |
#66
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07 ec300 was 00 xc200 now a 00 xc300. now parting out. 99 ec300 (now a pile of parts which are for sale) Stainless Cycle - Motorcycle Bolt Kits www.stainlesscycle.com |
#67
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sorry to jump in, but does anyone know the alternative energizer o rings part numbers? i read a post on it a while back before i had a problem with my sachs rear shock. i think they replaced it with a KTM part number?
cheers |
#68
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#69
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#70
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Confirmation
Maybe I'm a bit slow, but can someone explain to me exactly what to measure?
Do I measure the preload rings wound all the way up (they are still in contact with the spring at this point and providing minimal preload) and then wind the bottom preload ring down 10mm? Or do I measure my uncompressed spring which is 261mm and then wind the preload rings down until the spring measures 251mm? thanks |
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