Got some 2nd hand Revs recently (140mm dual air), lovely forks but I can only get just about 120mm of travel. Even with all the air released I can't get any more. They seem to hit their bump stops. I only have 140mm of stantion showing so they would basically hit the crown if they used all their travel. How easy is it to check they haven't been set at 120mm travel? The service manual makes it sound quite a task.
Thanks.
If the all travel spacer is correctly fitted, then the amount of travel will correspond to the amount of stantion you can see. The spacer stops them form extending to full travel rather than preventing it from compressing to the top of the stantions. However, if youve bought them secondhand, theres nothing to say they havent put the spacer in the wrong place? God knows, I'd pull em apart to see whats going on. Its really an easy job as long as youve got some fresh shock fluid and a syringe to measure it in with.
I might be wrong, but if there is 140mm of stantions showing then that is there max.
Its a quick easy job to look inside, just make sure you check the service manual for the correct oil levels, and that you have some form of solvent to clean the oil off of the paint.
Shock oil is silicone based and non corrosive, dont worry about splashing it about.
Cheers guys. I saw somewhere it can be done without removing the lowers? Just release all the air, undo the bolts and push it up from the bottom? Is that it or should I follow the manual and remove the lowers? And as far as I can tell its just 6ml of oil in the top after the lowers are bolted back on?
Thanks again.
6ml in the upper, but youll loose the 15ml in the lowers too doing it that way.
Idealy you should download the manual from SRAM's rockshox website, and remove the lowers to do it. You could do it the way you describe, but it involves undoing the nut on the bottom of the lowers and pushing the air piston shaft up and out to get to any spacers that may be installed. Trouble is, in removing the air piston that way, all the oil from the lowers will drain out anyway, and some of the oil from the uppers will drop into the lowers through the hole left by the removal of the air spring. If you going this far, you might as well undo the nut on the bottom of the other leg too and just pull the lowers off and do the job properly. Its the half arsed aproach thats probably causing you the problems now.