Ciao cascao, thank's for sharing your knowledge with your nice video.
I' m gonna service the Sachs shock of my gg txt 280 2000 and I would like to know how many cm the air/gas piston separator should enter in the schock absorber body.
i can't see the measurement you made on your video.
Cheers from Italy .
Thanks
do not know how many they use from factory.
On shocks I reassembled used the rule below:
Meassure shock shaft lenght that goes inside shock body (estimated pu bumper half compressed) and increase a little (10mm)
Newer ST's don't have pipe drain hole like first models.
Oil can acumulate inside pipe if you ride for long periods slow. If after that, you ride it hard (uphill open trothle for long periods) it can ignite "gum oil" inside pipe and get very hot with a lot smoke. I think this hapened with me when bike melted rear fender.
FWIW i was told by the Motul rep ages ago that full synthetic in a trials bike doesnt burn away in the silencer because the motor doesnt get hot enough like a moto crosser or race bike so they recommended semi synthetic. Actually they recommended their "scooter oil". I've used semi synthetic ever since with no problem but i am sure many will disagree. Always a horny subject this with so many different "recommendations". As long as the user is happy then thats as good a result as you can hope for.
Look at "flash point" at oil specs and choose lower ones to avoid oil spoonge at pipe
Motul 510 is going OK for me. Maybe will test the 710 someday.
Sachs Rear Shock Rebuild
in Gas Gas
Posted
Yes. You just need do unscrew shock bottom clevis (use heat to broke loctite and aluminium clamps to protect the shock stem)
It good practice change rebound bolt o rings due heat you used
Cut car bumper or buy new one from splat shop (gasgas bumper is sheaper than shercos)