K2 / Proflex Riders Group
General => Tech Forum => Topic started by: junkster on July 28, 2005, 09:44:58 pm
-
Help(http://idriders.com/newforum/YaBBImages/sad.gif) [smiley=diaper.gif] [smiley=turtle.gif]
- my trusty Stratos XCpro air/oil rear shock is packing up. It locks up every other 5-10 compressions (varies) and there appears to be occasional stiction on rebound occassionally. Does it need a rebuild or is it on it's way out?
Is a great shock and would hate to ditch it, (plus can't afford another air/oil shock).
Any ideas(http://idriders.com/newforum/YaBBImages/huh.gif)
Dan [smiley=beer.gif]
-
I think that you need to burp the shock. Go to the Stratos site and follow their procedure. I had one do this some time ago. It solved my problem. Its worth a try.
-
Hi Carbonman,
cheers - took your advice. Got some Automatic transmission fluid and spent yesterday with my hands submerged in the nausiating goo burping the shock. [smiley=bleh.gif] Did it 3 times to be sure as was serious amount of air/cavitation (it appears). First time I unscrewed the oil fill port there was a huge blowout of air which appeared a good indicator of how much air was trapped. Will reinstall this eve and hopefully it'll have sorted the lockup/stiction. If not it was worth a try seeing as the alternative was an inferior replacement anyways. [smiley=depressed.gif]
cheers, [smiley=beer.gif]
Dan
-
Well it didn't work - now the shock is totally locked up - I don't mind sayin I am totally gutted!!!!!(http://idriders.com/newforum/YaBBImages/cry.gif) [smiley=depressed.gif]
Any more ideas would be greatly apreciated as really can't afford a replacement shock and it means my bike is out of commission. (http://idriders.com/newforum/YaBBImages/cry.gif)I followed the burping instructions to the letter.
Dan
-
Don't know that I would "ditch" the shock just yet. A rebuild from Stratos was only $65 the last time I checked. Sounds like maybe you may have a bad seal and when you burped, rather than getting air out of your oil chamber, you may have gotten oil into your air chamber... Just a thought.
-
Hey Junkster, the only other thing I can think of is to remove all of the air and oil out of the shock and pretend that it is the first fill after a rebuild. I'm a glutton for punishment when things like this happen. Matno's theory might be right. See what Stratos says. A blown air seal could admit oil into the air chamber and cause a problem. All that trapped air in the oil side is a sure indicator. $65 isnt too bad for a rebuild. It is a great shock.
-
Hiya,
cheers guys. If I did go to Stratos would they charge extra considering the additional mods I have added to it, (an adapter of sorts bolted through and eyelet and a little filing of the rebound dial (in no way interfering in the shock body [smiley=nod.gif]), by playing the 'void warranty' card, (even though I know it isn't within warranty and I am paying for a straight rebuild?) I have heard horendous things about their customer support.
Also, I am in the UK so there is the exchange rate and postage to take into account.
I am a little confused Carbonman as through the burping process you remove all the air out of the shock anyway. (http://idriders.com/newforum/YaBBImages/undecided.gif)
Thanks for your ideas guys(http://idriders.com/newforum/YaBBImages/grin.gif)
cheers,
Dan [smiley=beer.gif]
-
I doubt they'd charge extra. In my experience, once you get through to them, the service is okay. However, I did give them a (debit) card number which was overdrawn (oops) and instead of saying something, they just waited until I called back 3 weeks later wondering where the heck my shock was. That was a little frustrating. Only took about 3 or 4 days after that though...
You might want to let them know that you DON'T want them to replace the rebound dial. Also, if you can remove the adaptor (you said it was bolt-on, right), that would eliminate the possibility of "issues."
-
Hi,
cheers Matno. Will definitely look into it and will take off the adapter if I send it away.
Thankfully I have managed to knock together a shock from an old 500lbs coil spring, half a Girvin rear elastomer shock, butchered scrap metal and axel parts from an old alloy push scooter, and a 1" bearing cup. Check it out (gives me sufficient travel and surprisingly very little bob - no rebound dampening unfortunately, but kick back minimal) Look a right dogs dinner though (http://idriders.com/newforum/YaBBImages/rolleyes.gif):
http://idriders.com/proflex/galleries/junkster/P1010003.jpg
http://idriders.com/proflex/galleries/junkster/P1010001.jpg
http://idriders.com/proflex/galleries/junkster/P1010002.jpg
The main downside is now there is no room for the front derailer, (I rarely shift from the middle ring much anyways so no big loss).
thanks for your help.(http://idriders.com/newforum/YaBBImages/grin.gif)
cheers [smiley=beer.gif]
Dan
-
Ha ha! Putting the "junk" in "Junkster"!
Just out of curiosity, what interferes with the front derailleur? Can't see any reason it wouldn't work in those pics...
-
Dan,
You are a constant source of inspiration for me. You are the man!
No more procrastinating, I need to get to work on a mod. Thanks.
From across the pond,
Terry
-
Hi guys,
cheers - first time my ensemble of battered pieces of metal crudely nailed to my bike has ever been the source of inspiration! [smiley=laughing.gif]
Wish I had a lathe and the right materials, though there is some satisfaction in junkin up stuff. [smiley=nod.gif]
The front derailier adjuster screws were being hit by the underside of the swing arm, pushing it into the large chainring. The s/arm is as far as it will swing down to accomodate the shock. Since I plan to use this while the air/oil shock is fixed or I save for a new shock, I don't mind not having the front mech - like I say hardly use it anyways. [smiley=beer.gif]
cheers
Dan [smiley=beer.gif]
-
Update - took the bike on the south downs - interesting result. (http://idriders.com/newforum/YaBBImages/rolleyes.gif)
Slow uphill climbs are a right pain cause while there is a surpising lack of bobbing uphill (standing, you can really power up them(http://idriders.com/newforum/YaBBImages/cool.gif)), when sitting, every so often with a compression the damn rear mech changes up or down a few gears - nightmare gear slipping. (http://idriders.com/newforum/yabbimages/emoticons/doh.gif) Guess it must be the full travel of the swingarm, coupled with a slighly worn chain, and the fact I need a bottom bracket with a shorter axel, (need 68*110, think I have closer to 68*115, maybe larger. (http://idriders.com/newforum/YaBBImages/shocked.gif) Granted should have changed that ages ago.
The shock does absorb a huge amount of hits though. Really surprised about that. [smiley=nod.gif]If I found one I think I'd be better off with a 600lbs/in coil spring. Better to think lLongterm and I am thinking I may invest in a long travel coil shock with rebound/compression assist instead of spending money getting my Stratos XCpro air/oil fixed.
Ahh well, hasn't cost me anything and at least I can get around on it.
D [smiley=beer.gif]
-
every so often with a compression the damn rear mech changes up or down a few gears - nightmare gear slipping. Guess it must be the full travel of the swingarm, coupled with a slighly worn chain, and the fact I need a bottom bracket with a shorter axel, (need 68*110, think I have closer to 68*115, maybe larger.
Actually, the "ghost" shifting is probably due to the fact that you're stretching the little piece of cable housing between the frame and the swingarm. When it's too short, it changes the length of your cable, leading to an unplanned shift. It's a common culprit on these frames...
-
ya know I think you have got something there - didn't think of that (http://idriders.com/newforum/YaBBImages/undecided.gif). Will check into it.
cheers [smiley=beer.gif]
Dan [smiley=groucho.gif]
-
one of the best mods on these bikes is a full length cable housing from frame right through the swingarm to the rear d.....
-
Agreed. I've done that to mine and it works like a charm. Difficult to keep the cable from working it's way up though. I have a zip tie glued in place just outside of either cable stop (which are drilled out) but when I take the rear shock off and forget to support the swingarm, it always pulls one of them out of place. Still worth it though...
-
You guys rock...
I got reading this before my last ride and sure enough, the rear brake and rear der. cables were inverted. I moved the rear der cable to the upper bosses and shifting got mo betta.
This also made for better routing of the rear disk cable. It's more clear of the crankset now. Wahoo.
Thanks
Will
-
cheers guys, bl00dy obvious in hindsite (http://idriders.com/newforum/yabbimages/emoticons/doh.gif) - gears shift near enough perfectly now thanks to increasing the cable housing between frame and swingarm. (http://idriders.com/newforum/YaBBImages/grin.gif)Just need to get a shorter axel BB and the drivetrain will be ideal.
Now to get another shock or the Stratos XCpro rebuilt.
cheers
Dan [smiley=beer.gif]
-
Hi Junkster,
if you are riding the South Downs does that mean you are UK South Coast based?
Both Simon and I are (Petersfield and Gosport) and the Southdowns are our regular riding territory.
We keep meaning the get all the UK Proflexers together for a ride one day - are you interested?
Drop us a line
Sprucey