Rebuilding My rear shock on my '93 KX 500

[Hawkeye58]

Hi all,

I have my rear shock apart for a rebuild, It's been about three years since I have been inside one of these and I am forgetting
what weight oil I used last time and how much as well. Anyone here have any experience with the rebuild of the rear shock?
The inside looks great, just had extremely dirty oil inside, and had leaked some of it past the seal. Thanks.

Hawkeye

[dave916]

i have only rebuilt sachs shocks , i used shock oil 2.5wt  (not fork oil) 
they usually take around 400ml depend on piston position in gas resiveor
it got to be filled completely  with no air {bleed}

[don46]

typically 5 wt, you can experiment with other weights, I used a redline "like water" oil in a 125 shock and have used 7.5 in hillclimb bikes.  there is no specified volume, you will make a mess and you want to make sure there is no air in the oil cavity. these do not use a piston like a Sachs or some Ohlins, they have a bladder, If you are unsure you may want to get a manual or take it to someone that knows what they are doing, these are not like forks and done wrong can make your bike suspension perform poorly. you will also need a nitrogen bottle, gauges and hardware to get the pressure up to approx 165 psi, do NOT use air

[Hawkeye58]

Thanks for your input guys.
Very helpful. I chose 7wt. Oil because
I am 6'0" and 230lbs.
The shock is simple construction, and went together
Smoothly. I thoroughly bled the shock, which took sesveral
Times via a bleeder screw at the top of the shock body.
I also pressurized the bladder several times with 40 psi
To seat the seal and bladder. The last time I rebuilt a shock the clip
Holding the bladder wasn't seated and let go upon adding the Nitrogen
Creating a unsafe situation. Hence my testing with air to ensure its being seated.
Now I can take it for Nitrogen filling.
Thanks again!

Hawkeye