[Closed] Rockshox Revelation - Issues

110psi all together or in each chamber?

sounds pretty normal to me, but let all air out and check it's not hydrolocked (too much oil somewhere).

Not hydroloc, 110psi recommended in each chamber, I have nearly half that and still not full travel.

Lovely and plush for all of the 130mm of travel but no more than that.

It's not got a travel reducer spacer in has it? Have you had full travel before?

Oil migrated into the positive air chamber? Too much oil in the lowers?

Ah.... Not full travel, do you mean the amount of stanchion you can see is 130mm, or that you're using 130mm?

If the former, then as above, most likely you've got a travel spacer on the air piston rod. Easy to remove 🙂

If you have too much lube oil in the air leg or a damping fluid leak into the other leg, both will prevent full travel even if you don't get hydraulic lock, the air pressure build up will prevent full travel. Also try 5 psi more in the neg chamber than the pos one.

Remove all air and check physical travel.

If your not at 150 then its probably a spacer.

The dual air has issues with air migration and requires a methodical approach to set up there is a thread on here that covers it. Also rs pressure tables are way out

Will try the ideas tonight.

There is def no spacer, I can see 150mm of stanchion but the O ring never goes past 130mm

Have you tried riding harder/faster?

Sometimes the last inch of rs travel can be the f me inch only ever used when screaming....

But do the air out check to rule out mechanical foul play.

Oil migrated into the positive air chamber? Too much oil in the lowers?

These forks don't have oil in the air side at all (well, a few ml in the lower leg, but very unlikely to pass through the -ve air seal, the shaft piston, and into the +ve air chamber...)

[b]If you've removed all the air, and you DO get the full 150mm of travel[/b], then you can be confident there isn't too much oil in the damping side stopping travel. I'd just set the sag and go for a ride...you'll get the full 150mm at some point....

DrP

That seems like very low pressure? Mine are u-turn air so might be different, but I'm 10 stone and run at 110psi pos, and something a little less neg.

Very low pressure - def that's my point about not getting full travel with such little pressure.

Always found RS a little over on the pressure chart for any weight. My old motion control revs needed around 95psi in each chamber (rather than the RS stated 110psi).

But these Blackbox ones are very low psi and still not getting full travel.

Will try the 0psi trick tonight and then reset the pressure. Otherwise it's a full strip and re-build I think and change the oil. Perhaps to a lighter oil like I've done on my Lyriks.

Where's LoCo when you need some advice.....:0)

Coffee break time 😀

Could be several things:

Check with no air in as mentioned above, if not able to get full travel
maybe seal blown in damper chamber allowing oil into lowers and hydraulic locking before full travel.

Too much oil in damper chamber.

Sticky/misaligned bushes or other components.

And set the pressure on the sag not the guidelines on back of fork:

http://locotuning.co.uk/forks-sag.html

+ve first then -ve chambers

Cheers Loco - I know where to come if it needs some expert work done.

If its a blown seal causing a lock at the end of the travel. Would the first 130mm still be buttery smooth? Or would you expect it to effect the first and middle of the stroke?

These forks don't have oil in the air side at all (well, a few ml in the lower leg, but very unlikely to pass through the -ve air seal, the shaft piston, and into the +ve air chamber...)

That few ml in the lower leg (5cc) could easily have been increased at a service, thus reducing the air gap in that leg on full fork compression and reducing travel.

I run my team Revs with about 15cc of lube oil just to keep them better lubed. I also prefer the way they ramp up even if I do lose the last 10-15mm of travel.

85 psi +ve, 85psi -ve for me at 10.5 stone seems about fine to ride. I don't quite get 25% sag at this pressure but I use full travel nearly every ride. I could go 80 psi top and bottom to get 25% sag, but then I'd be bottoming them out all the time, and I'd have to run compression damping to keep em propped up so I prefer them to not feel quite so damped on compression so I run them at 85 psi. Nice forks I prefer them to my old fox float 140's for feel

It'll come to a dead stop if there's too much oil in the lowers, may notice a slight increase in the progressivness as the air gap gets smaller towards the point they bottom out.

I was under the impression that all the damping was done within the sealed cart in the left leg, all the air both + & - was in the sealed right leg.

And the oil in the lowers were just for lubing the bushings and seals. That's was a scratch to the stanchions is not hugely serious on Revs as the air can't leak out...

I very rarely get full travel on RS air forks. Only on really heavy (bad!) landings. If you're getting 130mm, I reckon that's probably about right. The air can only compress so much.

Just had my 150 Revs back from Loco and was getting about 120mm at most. I would expect this though.

I think recently MBR tested the Revs and said they never got full travel either.

🙄

well, i seem to need a lot of air in my Revs, for my weight (64kg)

rode today at 115psi, seems great. something wrong Loco or am i just getting too rad for the sticker weights?

this is to stop them riding half way into travel.

also your site says adjust compression.. how? i've got red rebound, and blowoff. remote poplock RLT.

fork works great btw now i've upped both pressures.

Bawked? RS tend to be quite flimsy if spanked

i've been spankin' it, but it's in good condition. lightly spanked and lovingly serviced. funny cos my old reba needed less than the recommended pressure, so i assumed it'd carry over (both 32mm forks). nope, 90psi is like a wet sponge, not good when riding.

now running around 115 both ends (Monarch shock and fork + and -) which is .. odd?

can we get the shim stacks / orifices changed on 2012 Revs Loco?. should have started new thread sorry, but i think OP is ok? 🙂

i want something firmer basically the fork is too plush when unlocked (and too short, but that's another thing). maybe i can adjust the poplock cable pull - just leave a loop of slack or something - to give me a half locked fork for riding fast hmmmm! not ideal either would prefer firm<>very firm rather than soft<>semi-firm. maybe i need an expensive pushloc to play with? don't say get a blue knob i can't let go of bars 😉

just leave a loop of slack or something

Adjust the floodgate?

There's a lot of variation in shock pumps. I have two shock pumps, one reads 60psi in my revs, one reads 90psi. I tend to trust the latter more but RS still recommend 120psi for my weight.

What I'm saying is that your 60psi might just be wrong. Forget the absolute numbers - set them up according to sag / feel and then +/- 5% to adjust.

good points both cheers will ruminate some more.

I must be a freak. I run 75-85 psi in my 150 Team Revs, and I am 92kg 😕
Must be because my arse is always stuck down on the saddle end 😳

That few ml in the lower leg (5cc) could easily have been increased at a service, thus reducing the air gap in that leg on full fork compression and reducing travel.

I run my team Revs with about 15cc of lube oil just to keep them better lubed. I also prefer the way they ramp up even if I do lose the last 10-15mm of travel.

But ...and this may be u-turn only.... There's no oil in the actual air piston....

DrP

I've had this problem, there's nothing wrong with them

I'm only 10st and find that trying to get very little on each chamber reduces travel because you seem to have too much air in the negative to stop them topping out.

Try adding a bit to each chamber gradually and be prepared to put more than you think in the positive and then even it out wth negative

My 150mm revs are now at about 147mm with god knows how much in each chamber.

It will take time

That's not the same problem, Moggy.

I'm 10.5 stone and have been running mine at 85psi but never get the last cm of travel either - can't imagine ever being able to get it as it ramps up so much.. even using all my weight or dropping front wheel first off big steps won't do it!

If it helps anybody I think i have found the cause of the problem.

Full strip of the forks last night.

- All air reomved from the fork - still could not get full travel

- Dual Air side serviced, and there was no fault on this side

With the dual air cartridge out of the fork fork back together - still not full travel

- Service the blackbox side, all seals look fine. But I removed about 7ml of fork fuild from the damper. Hey presto now full travel.

Also removed another 10ml of 5wt oil and replaced with 2.5wt oil. Damping seems slightly improved.

Now running 80psi (rather than 60psi) in both legs, with more travel available and a better feeling fork.

Now just hope it stays that way.