12-03-2015, 06:53 AM | #1 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
|
Zongshen RX3: Suspension System
Fork Disassembly and Inspection
Upper Fork Tube Disassembly To disassemble the forks, begin by loosening the cap of the fork with a 19 mm wrench. Lower the upper fork tube to reveal the fork spring. Insert a 14 mm cone wrench, or another thin wrench, between the fork coils, and grab the lock nut below the fork cap. While holding the lock nut, remove the fork cap and washer with a 19 mm wrench. Remove the fork spring, and drain the fork oil. Remove the upper fork tube following the instructions in the CSC Fork Maintenance Tutorial at the following link. http://www.cscmotorcycles.com/Articles.asp?ID=263
__________________
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 Last edited by SpudRider; 12-03-2015 at 11:40 PM. |
|
12-03-2015, 06:54 AM | #2 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
|
Lower Fork Tube Disassembly
Disassemble the fork base by removing the bolt (A) with a 2.5 mm Allen wrench. Secure the fork base (A) in a vice. Insert a thin rod through the holes of the fork (B), and remove the inner fork tube from the base by twisting the tube in a counter clockwise direction. Push the damper rod down the lower fork tube to remove the base plug (A), and disassemble the lower fork tube.
__________________
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 Last edited by SpudRider; 12-08-2015 at 02:35 PM. |
|
12-03-2015, 06:55 AM | #3 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
|
Fork Spring Inspection
Measure the length of the fork spring. Replace the spring if it is shorter than the minimum length.
__________________
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 |
|
12-03-2015, 06:55 AM | #4 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
|
Shock Absorber Adjustment
Cylinder Gas Pressure The standard gas pressure in the cylinder is 44 psi. The gas pressure influences the compression damping of the shock.
__________________
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 |
|
12-03-2015, 06:56 AM | #5 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
|
Spring Preload
Loosen the Allen head bolt, and turn the locking collar (A) to adjust the spring preload. The spring preload should be set to the proper race sag for best performance. Directions for adjusting the spring preload are contained in the following thread. http://www.chinariders.net/showthread.php?t=14677
__________________
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 |
|
12-03-2015, 06:56 AM | #6 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
|
Rebound Damping
Rebound damping affects the speed at which the shock extends while recovering from compression. The shock absorber has 15 settings for rebound damping. Turning the screw clockwise slows the rebound damping. Turning the screw counter-clockwise accelerates the rebound damping.
__________________
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 |
|
12-08-2015, 04:49 PM | #7 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
|
Today I removed the valve cap on the stock shock absorber. Underneath I found a standard schrader valve. I measured the pressure in the shock with my tire gauge, and it read 67.5 psi. The specified press is 44 psi. Perhaps the high pressure contributed to the harsh ride I experienced with this shock absorber.
I lowered the pressure to the standard setting of 44 psi. If the shock is not performing properly for you, you might want to check the air pressure. However, the shock cartridge contains very little air, so it might not make much of a difference.
__________________
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 |
|
12-08-2015, 09:08 PM | #8 |
Banned
Join Date: Sep 2015
Posts: 176
|
|
|
12-08-2015, 11:33 PM | #9 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
|
__________________
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 |
|
12-09-2015, 03:51 PM | #10 | |
Join Date: Oct 2015
Location: Berthoud, CO
Posts: 205
|
Quote:
How do you access the valve? Do I have to take everything apart? My valve faces the rear. I'm thinking of removing the shock and reinstalling it with the valve facing the front. Will it fit? Will I be able to access it then? Rebound adjustment and preload: What is a good starting setting? I am a lightweight, 160 lbs w/o gear.
__________________
Dan CSC RX3 Cyclone, CSC TT250, Moto Guzzi V7 II, KLR650 |
|
|
12-09-2015, 04:44 PM | #11 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
|
Quote:
http://www.chinariders.net/showthread.php?t=14677 You might be able to check the air pressure from the top. I can't guarantee a minor difference in air pressure will make any difference in shock performance, but it can't hurt to try. However, adjusting the spring preload will certainly improve the performance of the shock. The schrader valve of the stock shock absorber is located in the same position as the pressure valve on the Progressive shock absorber. You must remove the saddle, fuel tank, and a small emissions canister to see the valve from the top. Remove the valve cap, and you might be able to get a small pressure gauge onto the valve, if you have small hands. Lift the rear wheel to get the weight off the shock before you measure the pressure. If you cannot access the pressure valve from the top, I wouldn't worry about it. I'm beginning to doubt a small difference in air pressure will have much effect on the performance of the stock shock absorber.
__________________
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 Last edited by SpudRider; 12-09-2015 at 05:24 PM. |
|
|
12-09-2015, 08:44 PM | #12 |
Join Date: Nov 2014
Posts: 159
|
With my understanding of suspension wich is some what limited but with a good ME guess; I don't think chages in air pressure will make any noticeable pre-load difference. These are not air spring shocks like in many mountain bikes. The air pressure is there to minamaize oil foaming while working the shock hard. So the pressure is in the oil damping circuit and thus acts equally on the top and bottom of the internal piston and valving.
|
|
12-09-2015, 09:59 PM | #13 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
|
Quote:
__________________
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 |
|
|
12-09-2015, 11:05 PM | #14 |
Join Date: Jan 2015
Location: Phoenix, AZ
Posts: 267
|
Spud, would it be possible to attach a flexible extension on the valve and then zip tie it to an accessible location?
__________________
George 2016 CanAm Spyder F3-L |
|
12-09-2015, 11:36 PM | #15 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
|
Yes, that might be possible, George.
__________________
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 |
|
|
|
|
|