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Ah right. I had the 2004 versions of these. Cheapest & easiest is to change the oil & get the right amount in there. It's also possible that a previous owner used a lighter oil than recommended.
On mine the only thing affected by air was the preload, which tended to make the fork lose any sensitivity to smaller bumps, and generally feel a bit rubbish, so I kept that air chamber empty.
Other than that, you could have a long search for a suitable spring.
Does the ETA still work?
BareNecessities-
Lockdown? You mean the ETA thing? How do I test it - like, what's it supposed to do? Give more travel or less or something.
It sounds like it needs more or thicker oil. I'll have to look for service video or something to see if I can be arsed with it. Don't like anything to do with rubber seals or lots of liquids. Fiddly, messy, carpet staining bastard work.
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Ok, just fiddled. With ETA on the forks compresses down.
If you turn it off the fork extends more.So, I could probably run it enabled and that would take away a lot of the bobbing.
hippy
Both legs have nut covers underneath them.
Ah, they have 03 written on them and "Marathon S"
http://my-sport.spb.ru/manual_1/2003%20bomber.pdf
Marathon S
Right leg - HSCV cartridge
Left leg - ETA cartridge
Fork bottoms too easily; needs more than maximum preload to attain proper sag
= Spring rate too soft or fork oil too low