The stock shock absorber
cannot be rebuilt; it is sealed. The Progessive shock
can be rebuilt.
The Progressive shock has 6.3 inches of travel when installed on a 2nd generation, Kawasaki KLR650. However, I don't know how this translates when the shock is installed on a Zongshen RX3.
The stock shock absorber of the RX3 has 5.6 inches of travel.
I strongly recommend you adjust your budget to include the purchase of the Progressive shock absorber,
especially if you wish to ride a lot off road.
The Progressive shock absorber is much superior to the stock shock absorber. Switching to a 21-inch front wheel further increases the off road capabilities of the stock RX3.
If a set of stiffer fork springs becomes available, the off road capabilities of the RX3 will be further enhanced.
__________________
Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894