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#1 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Zongshen RX3: Sprocket Carrier Modification
The Zongshen RX3 sold by CSC in North America has a rear cushion hub. The sprocket carrier which inserts into the cushion hub is designed to hold rear sprockets with the following dimensions.
![]() Zongshen only manufactures the stock, 44T rear sprocket. As shown above, Sprocket Specialists manufactures the JTR473 sprocket, which is available in 37T, and 40T configurations. ![]() http://www.jtsprockets.com/catalogue/sprocket/JTR473 I was told CSC will soon offer for sale aftermarket sprockets with 42T, 43T, 45T, and 46T configurations to provide more options in addition to the stock, 44T sprocket. ![]()
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." ![]() 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; 09-04-2015 at 03:26 AM. |
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#2 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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While awaiting the aftermarket rear sprockets to arrive at CSC, I decided to modify a spare sprocket carrier so I could experiment with different sizes of rear sprockets. Trimming 2 mm from each of the radial arms on the sprocket carrier, I was able to modify the sprocket carrier to accept the following sprockets, with the following configurations.
![]() JTR811 http://www.jtsprockets.com/catalogue/sprocket/JTR811-48 ![]() This sprocket fits the Suzuki DR200SE motorcycle, and is available for sale in the United States in 39T, 45T and 46T configurations. JTR1826 http://www.jtsprockets.com/catalogue/sprocket/jtr1826 ![]() This sprocket fits a variety of Suzuki and Kawasaki ATVs, and is available for sale in the United States in 39T, 40T, 41T, 42T and 44T configurations. ![]()
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." ![]() 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 |
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#3 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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The photograph below shows how I removed 2 mm from each of the six radial arms on the sprocket carrier.
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__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." ![]() 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 |
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#4 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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I purchased a JRT811.46 sprocket from eBay, so I could experiment with a 13T/46T sprocket ratio for my RX3. I have now ridden about 250 miles with this lower sprocket ratio, and I like it even better than the 13T/44T sprocket ratio I installed earlier.
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." ![]() 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 |
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#5 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Finally, here is a photograph of the JRT811.46 sprocket installed on the rear wheel on my Zongshen RX3.
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__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." ![]() 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 |
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#6 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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I was barely able to fit the 46T rear sprocket with my stock, 110-link drive chain. Therefore, I'm sure you would need to get a longer, 112-link drive chain, to fit a tight new chain onto a 13T C/S sprocket with a 46T rear sprocket.
![]() I didn't lose any top speed by switching to the larger, 46T rear sprocket. However, I gained torque in all gears, and I really like this sprocket ratio. Here are the engine RPMs I recorded at the following speeds. These are actual speeds from my GPS calibrated, SpeedoDRD dashboard. ![]() 50 MPH: 6,200 RPMs 55 MPH: 6,800 RPMs 60 MPH: 7,400 RPMs 65 MPH: 8,100 RPMs 70 MPH: 8,800 RPMs 75 MPH: 9,500 PRMs I usually ride at lower speeds, so I like the increased torque with this lower gearing. Also, I am able to maintain speed with higher gears while climbing long, steep grades with this lower gearing. I also plan to experiment with a JTR811.45T rear sprocket. Depending on my riding conditions, I can now switch between 13T/44T, 13T/45T, and 13T/46T sprocket ratios. I don't plan to go any lower than my current, 13T/46T sprocket ratio. ![]()
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." ![]() 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 |
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#7 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Switching between my stock sprocket carrier, and the modified sprocket carrier, I now have the following options for rear sprockets available in the United States.
37T, 39T, 40T, 41T, 42T, 43T, 44T, 45T, 46T If desired, I can also purchase a 48T rear sprocket from the Ukraine, Russia, and other European countries. ![]() You can purchase 13T and 14T, counter shaft (C/S) sprockets from CSC, and Taobao. With this variety of C/S and rear sprockets available, you can tailor many different sprocket ratios. ![]()
__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." ![]() 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 |
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#8 |
Join Date: Jun 2015
Location: Las Vegas
Posts: 158
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I would like to see a more comprehensive RPM vs Speed sprocket chart. I did the same thing with my KLR, had a non-stock 16T front sprocket paired with a different rear sprocket. I can't recall if it was a 46T or not, but I made my decision based on an already published sprocket ratio guide due to my riding style and what I was trying to accomplish.
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#9 |
Join Date: Jul 2015
Location: Tigbauan, Iloilo City, Panay Island, Philippines
Posts: 177
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Man SpudRider, great idea, I hadn't thought of getting a new carrier...
Need to see if I can buy any of those sprockets here locally. Great idea, just great. Riceburner |
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#10 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Perhaps another RX3 rider could chime in here. It would be great to have a GPS-proven speed vs. RPM table in all gears at the stock ratio for comparison.
Excellent write-up, Spud.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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#11 |
Join Date: Sep 2014
Location: Arvada, CO
Posts: 1,004
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Very cool. I will likely go to a 13/45 ratio when it becomes available from CSC. 75 mph at 9500 is past redline and I would be more comfortable doing 75 at 9000.
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Red 5 standing by! 2015 CSC red RX3 with 19" front wheel, Shinko 804/805, skid plate, tall seat, 13T/45T sprockets, progressive shock, Winyoochanok windshield, GENSSI LED headlight, SW-Motech tankbag, Shorai Lithium battery 2014 Ural Patrol |
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#12 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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The analog tachometer shows the redline starting at 9,000 rpms, but I think the actual redline is higher.
![]() ![]() In any event, I am content to cruise at 65 mph on the interstate highways. I much prefer to travel secondary and tertiary paved roads. When planning a trip, I try to incorporate gravel and dirt roads, as much as possible. ![]()
__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." ![]() 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 |
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#13 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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The 13T/45T sprocket combination is certainly an excellent choice. Besides being a compromise between the 13T/44T and 13T/46T sprocket ratios, I think you could install a new, 110-link drive chain over the 13T/45T sprockets. You need to get a 112-link drive chain if you plan to install a new chain over the 13T/46T sprockets.
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__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." ![]() 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 |
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#14 | |
Join Date: Sep 2014
Location: Orange County, CA
Posts: 410
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Quote:
Since I do a fair amount of super-slabbing, I'm trying to figure out the right combination of sprocket and rear gear to get me to top speed of the RX-3 right at the horsepower peak of 9,000 rpm. But good to know there are choices available to experiment with, and the cost of the sprocket or rear gears are reasonable. |
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#15 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
![]() ![]() I think the 13T/46T sprocket combination might be the ratio you seek. The more I ride with this sprocket combination, the better I like it. ![]()
__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." ![]() 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 |
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