Lefty clunk

[JRogers]

I have a Lefty Max SPV+ on my 2005 Prophet 1000. It clunks. It seems to happen in the middle of the travel and it's stronger and louder on the rebound.

The shop or I have taken the spring and cartridge out, changed the spring, greased the internals, checked the SPV pressures, checked the headset bearings...basically, it's almost assuredly something with the internals. It's been happening for about a year and it's getting very, very annoying. I am otherwise happy with the fork, but this is killing me.

Any ideas?

[Westy]

Did they check/changed the oil? Low oil has caused clunking on some forks I've had.

[JRogers]

It seems some more in-depth mtbr searching indicates that the culprit is likely an issue with air and oil mixing and possibly a bad o-ring.

Any tips on lefty rebuilding? I do all my own suspension servicing, but I am not well versed in the intricacies of the Lefty. I'm guessing a full rebuild is going to be harder than with my Shiver, which is the easiest fork to work on ever.

[sanjuro]

I wrote a bunch of instructions how to rebuild that exact lefty on MTBR.com. The Cannondale forum are a bunch of experts on the lefty as well.

[TreeSaw]

It seems some more in-depth mtbr searching indicates that the culprit is likely an issue with air and oil mixing and possibly a bad o-ring.

Any tips on lefty rebuilding? I do all my own suspension servicing, but I am not well versed in the intricacies of the Lefty. I'm guessing a full rebuild is going to be harder than with my Shiver, which is the easiest fork to work on ever.

Sq-Earl generally does all of our suspension servicing too, but we sent my lefty out for service and it came back as smooth as butter (and with adjustments). Sorry :(