11-09-2015, 03:12 PM | #1 |
Join Date: Sep 2014
Location: Orange County, CA
Posts: 410
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Gearing the other way... for highway use
I've read the thread regarding changing the stock 14T counter sprocket to a 13T piece with keen interest. Sounds like a solid plan for those who do a good mix of trail riding and pavement.
But in SoCal, it seems that we're a concrete jungle, and there's lots of highway droning to get to any kind of trails. (At least, that's true of where I currently live.) And despite a 65 mph speed limit, riding at 70 - 75 is more often the norm than not. The RX3 does fine at 70-75 mph, and I'm confident it can do it all day long. But sometimes I need to go a bit faster, and I've noticed that I'm spinning the engine past its power peak (which happens to be the 9,000 rpm redline.) I spoke with Gerry at CSC and he has been using a 42T rear sprocket and loving it, especially since he's got a long highway commute. The 42T sprocket is about 5% taller than stock, so at my current peak speed, I can expect to drop 200-300 rpm. I thought about it over the weekend and put in the order today for the rear gear. At $35, it's inexpensive enough to try and, if it doesn't work, I can certainly re-install my 44T rear sprocket. I'll report results after I install the sprocket. And in a few weeks, I hope to receive the windshield from forum member Winyoochanok and see if that makes a difference in top speed. |
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11-09-2015, 03:18 PM | #2 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Good for you. I'm sure you will be pleased with the reduction from 44T to 42T. It is very nice to have a selection of sprockets available so we can tailor the final gear ratio to the type of riding we prefer.
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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 |
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11-09-2015, 03:21 PM | #3 |
Join Date: Oct 2015
Location: White Mtns. NH
Posts: 488
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Spud, this could turn into another dual sprocket thread like over on the TW200 forum
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2016 Versys 650 LT, 2015 RX3 Red, 2011 Ural GearUp, |
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11-09-2015, 03:36 PM | #4 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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__________________
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 |
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11-10-2015, 04:27 AM | #5 |
Join Date: Oct 2015
Posts: 321
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I've installed a 15z front sprocket some 2000km ago and I'm loving it!
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11-10-2015, 06:37 AM | #6 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Where did you purchase the 15T front sprocket?
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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 |
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11-10-2015, 07:32 AM | #7 |
Join Date: Oct 2015
Posts: 321
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From a local manufacturer ("Catalano", http://www.catalano.com.ar/ in Argentina). I originally put the one for Suzuki DR350 but after Reading a post of yours about the difference in size (half a milimeter) checked the catalog and switched to the one for the Beta Chrono 2.5 (I don't know if that bike is available elsewhere with that or other name).
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11-10-2015, 09:29 AM | #8 |
Join Date: Sep 2014
Location: Orange County, CA
Posts: 410
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Thanks for the great info, Juanro! So with a 15T/44T combo, you have an effective 2.93:1 drive ratio (versus the 3.14:1 stock for the 14T/44T sprocket combination.) That's about 6.7% taller.
Can you tell us if gearing taller has allowed you to reach higher highway speeds? How is passing power in 6th gear? I'll have to look into the Catalano catalog. I see the counter sprocket on page 128 of the online catalog. This has me thinking... |
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11-10-2015, 02:17 PM | #9 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
Did the Suzuki sprocket fit tightly on the counter shaft? Did you measure the Suzuki sprocket to see if the measurements are actually a little larger than the Zongshen sprocket?
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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; 11-10-2015 at 03:21 PM. |
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11-10-2015, 02:37 PM | #10 |
Join Date: Oct 2015
Posts: 51
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I'm surprised that there isn't one already. I could surely benefit with a 15T sprocket with my so cal commute as well. Will be monitoring this thread...
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11-10-2015, 02:57 PM | #11 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
https://www.rockymountainatvmc.com/p...rocket?v=12255
__________________
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 |
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11-10-2015, 03:06 PM | #12 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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However, if you don't get a tight fit on the counter shaft, the JTF432 sprocket will damage the C/S splines, and you will need to take the engine apart to replace the counter shaft.
__________________
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 |
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11-10-2015, 03:57 PM | #13 |
Join Date: Oct 2015
Posts: 321
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Define "tight".
I didn't measure the sprocket, and it is cheap enough to replace one or the other without much pain. Both fit snug to the hand in the spinning sense; and both have a Little axial play, as the holding nut can't reach to the face of it (the sprocket leaves about 1mm of exposed spline). A judicious use of spacers/washers fixed that. Top spead hasn't increased, if any is a bit lower (in 6th). Overtaking reaction is still good, specially if you keep rpms above 6/7k. If not you can always downshit, a quick fix being a motorcycle. I'd say that 5th gear now is about the same as it was 6th before, leaving me with a 6th/overdrive for relaxed cruising (I'm lying myself, I don't cruise relaxed haha) At high speeds, rpm droped about 600rpm for the same speed, or speed increased 5mph for the same rpms. Overall very satisfied with the change. There was some fear that the bigger sprocket will not fit, and indeed is a snug fit (chain passes mere milimeter away from the clutch vertical axle and the gear change lever) but in the end if Works very well and doesn't rub any part. |
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11-10-2015, 04:58 PM | #14 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
I am interested in radial tightness, or 'spinning sense.' You stated both sprockets "fit snug to the hand in the spinning sense." Was the Suzuki sprocket as tight in this sense as the Catalano sprocket?
__________________
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 |
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11-10-2015, 05:04 PM | #15 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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The JRF432 sprocket fits many Suzuki motorcycles, including the following bikes.
DR200 DR200SE DR-Z400S DR-Z400SM Can anyone measure one of these sprockets with digital calipers? FastDoc has a DR-Z400S. I wonder if he has a spare C/S sprocket he can measure?
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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 |
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