Discoveries with jrTs

[carter]

Just to give you guys a heads up what I notice when taking apart my jrTs. Basically I took them apart to fix the “knocking” sound during rebound. The Marzocchi manual says this is due to “too much rebound damping”. I went about draining the oil in the forks; I noticed that the oil height from the factory was at 110 mm from the top. Anyhow I unscrewed (counter clockwise) the internal rebound adjustment one turn to hopefully rectify my problem. I then filed the tubes with Golden Spectro (7.5w) 90 mm from the top. Sealed everything up and went out for a test drive.

The knock is still there although not as prevalent. The rebound is definitely quicker (not sure if I like), I may try another turn, or perhaps do the complete opposite and increase rebound damping.

Anyhow the biggest change is the compression due to the increase in oil height. I basically notice that the increase in oil height served the same purpose as increasing the air pressure in the fork via the air cap.

[Sasquatch 2002]

WARRENTY! well if u have another fork for the time being that u could ride then i'd send it in...otherwise u might just want it to get re-built

[Leifless]

why warranty. it appears to be working fine except the knocking.

[Millstone]

Increasing your rebound damping would make the fork top out worse, which is probably what it's doing. Seeing as rebound is set to (if I remember right) one full turn from the factory, you basically just fully opened your rebound damping.

Try turning clockwise three turns. That solved my "knocking."

I've seen it so many times. A person could've taken 5 minutes to turn up their rebound.. instead they send their fork away for 3 weeks and waste a bunch of Marzocchi's (usually Norco's) time that could be way better spent on forks that actually need it. I'm not flaming you or anything, just putting it out there.

[Millstone]

While we're on the subject, I may as well add the pumping rod drilling instructions. They're vague but if you can't understand them you shouldn't be fiddling with your forks innards anyway.

For those who are interested in drilling out their fork here is how it is done.

1- disassemble the fork and pull out the plastic pumping rods
2- find the circlular hole at the bottom of the pumping rod(compression hole)
3- about 5-10 mm above this hole drill another 2-2.5 mm hole through both sides of the rod. THIS IS NOT MY RECCOMENDATION, YOU SHOULD PROBABLY START WITH ONE HOLE PER ROD.
4- reassemble and fill with oil to proper level
5- You may need heavier springs (and/or heavier oil) now that the rod is drilled. The compression is much easier and lighter.

FYI I won't be held responsible for any damage you do to your fork(s).

[marksnet]

dammit i just did that to my forks and my head fell off.

[Leifless]

just a note to phlegms instructions: i started drilling ONE 1/16" hole 8mm above and it did wonders. start small, then work your way up.:)