CRF's Only Forums

Dialing in my suspension...

Got the forks set alot better than they were, but while educating myself on the shock, i kinda released the pressure on it .

It already has pro-action front and back, i weigh about 160 with gear, and the bike is about 220 i'm guessing. (i'd rather not say what kind of bike it is, .) i mainly ride moto and supercross.

I don't have access to nitrogen, but i know compressed air will work, it just varies with the temp.

About how many psi should i put back into it?

Oooops thought you were speaking about the forks first post

KX250....

•Inject nitrogen gas to a pressure of 50 kPa (0.5 kgf/cm², 7 psi) through the valve on the gas reservoir.
•Check the rear shock body and gas reservoir for oil and gas leaks.
••If there are no leaks, inject the nitrogen gas up to the 980 kPa (10 kgf/cm², 142 psi) pressure.

DO NOT charge your shock with compressed air. The reason your shock is charged with nitrogen and not compressed air is because nitrogen is an inert gas, which means it won't react with anything, if you use air it has the potential to react with temperature and oil and could explode. That is why they use nitrogen in hydraulic accumulator's.
You might think i'm blowing wind up your rear but it does happen.

I'm pretty sure the reason to use nitrogen instead of air is mainly water content. This is two-fold, the water content makes the expansion/compression unpredictable as temperature varies, and it can lead to rust.

I cant imagine air making something "blow-up", but he may be smarter than I.

CerealKiller wrote:I'm pretty sure the reason to use nitrogen instead of air is mainly water content. This is two-fold, the water content makes the expansion/compression unpredictable as temperature varies, and it can lead to rust.

I cant imagine air making something "blow-up", but he may be smarter than I.

For something to blow up you need oxygen, fuel and an ignition source.

In this case shock oil is fuel, the compressed air he was going to use would have the oxygen and the heat generated in the shock the ignition source.

CerealKiller wrote:I cant imagine air making something "blow-up", but he may be smarter than I.

Try covering your air filter with a plastic bag before you go riding, then you will see you need oxygen to make things burn