fork oil

[montjuic]

Hi all, can anybody tell me how much fork oil to put in a set of gsx1100esd front forks.
Thanks for any help

[Who Dat?]

A manual would give you the number of CCs, but general rule of thumb is to remove the spring, collapse the fork, fill it to about 6-7 inches from the top.

[Rich82GS750TZ]

US/Canada models were not GSX, Just GS
Look for this manual:
GS1100 '80-'83 T,LT,EX,SZ,EZ,SD,ED,ESD (37MB) - Direct Link
on BikeCliff's website (linked in my signature). Top section, middle column. Your bike should be covered in this one. Look in the model specific area toward the back of the book.

[montjuic]

Big thanks to you both it's 246cc according to the link from rich82gs750tz

[bwringer]

The amount of fork oil is entirely irrelevant and only an approximation; what matters is the fork oil level, which should be set + or - 1mm.

Most of us overfill by a bit, then use a large syringe with a marked tube to slurp out the excess and set a precise level.

The most common fork oil level on vintage GS bikes is 140mm (fork collapsed all the way, held vertically, spring out.) from the top. What it should be for your specific bike I dunno.