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11-17-2015, 10:30 AM | #1 |
Join Date: Nov 2015
Location: Woodstock, GA
Posts: 15
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2009 Tmec 200cc w/ Street Package Setup Sprockets
I know that there are like 15 different forums about this subject... But I have yet to catch my exact bike with a sprocket swap. I have the 17T counter sprocket that came OE and don't plan to change it because of limited availability and possible clearance issues. The rear sprocket is a 56 tooth and I run a 140/70/17 rear wheel/tire setup. I've been sorting the bike out engine wise... But prior to the rebuild I am performing, the bike was topping out at what I presume to be 45mph (my speedo needle was broken before the restoration). I want the bike to be able to run at 60-65mph with out straining so badly. I have done the math and compared numbers from JT-Sprockets which leads me to want the gear range produced by using a 48T rear sprocket. That is a 2.82 gear ratio instead of the stock 3.29 ratio. I live in a busy suburb just north of Atlanta which means I am basically a rolling speed bump at the stock gear ratio. Has anyone been able to purchase or have a counter sprocket made for this bike? I have several sources of where to have one made, but what hick-ups might I run into as far as fitment? I bought my bike with no counter sprocket cover so I'm not sure what the outcome would be in terms of clearances.... I have a sprocket cover on the way though!!! I am just impatient with parts. Thanks for any help guys!
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11-17-2015, 11:26 AM | #2 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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A new countershaft sprocket would be an easy find.
I'm not so sure about the rear sprocket; if it was my bike, I'd remove the rear wheel and measure the sprocket. Once you have specs, you can begin comparing it with Japanese models, and we can help.
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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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11-17-2015, 02:13 PM | #3 |
Join Date: Jul 2010
Posts: 206
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Culcune has experience with rear sprockets on the TMEC. It seems TMEC went with a rather odd rear hub. There are sprockets available, but they are nothing common.
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Jon, in Keaau, Hawaii |
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11-17-2015, 10:49 PM | #4 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Perhaps, but measurements will allow us to confirm. You never know if there was a production change.
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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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11-18-2015, 12:09 AM | #5 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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One can hope.
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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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11-19-2015, 06:59 AM | #6 |
Join Date: Nov 2015
Location: Woodstock, GA
Posts: 15
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So The largest I counter sprocket available that I have found is the 17T that I already have.
17T - 20mm ID - 7mm thick - 428 Chain Size - 18mm from L bolt hole center to Rbolt hole center. The rear I think I found the Derbi Senda-R 125cc sprocket will fit. All of the specs appear to be identical: 56T to 48T - 6 Bolt holes which are paired in 43mm spaces - 103.55mm inner diameter. http://www.jtsprockets.com/catalogue/model/3348 |
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11-19-2015, 11:07 AM | #7 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Are the bolt holes on your rear sprocket grouped in pairs like that? Do you have a pic of your rear sprocket?
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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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11-19-2015, 12:14 PM | #8 |
Join Date: Nov 2015
Location: Woodstock, GA
Posts: 15
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They are grouped like that... |
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11-19-2015, 01:26 PM | #9 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Congrats on finding a match! How long did that take you? I've perused the JT site for hours on some occasions.
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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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11-19-2015, 02:14 PM | #10 |
Join Date: Nov 2015
Location: Woodstock, GA
Posts: 15
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Thanks!
As it turns out, the rear sprocket is commonly swapped on these... But with several variations of wheel/tire sizes from the factory it became very difficult. It didn't take long thanks to the forum... But I'm still iffy in what gear ratio I want to chase. |
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11-19-2015, 06:12 PM | #11 | |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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Quote:
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"Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350 |
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11-19-2015, 08:19 PM | #12 |
Join Date: Nov 2015
Location: Woodstock, GA
Posts: 15
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See, I'm on the fence. I have the calculations of what speed matches which rear tooth / gear ratio... but rear tire is not incorporated. I want the bike to run 60 without fail, at grave digging rpm. I want 50mph as a set cruising speed since every road around me is a 45 and seeing as I am just north of ATL, everyone assumes 55mph in a 45mph.
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11-19-2015, 09:13 PM | #13 | |
Join Date: May 2006
Location: Yuma, Arizona
Posts: 9,055
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Quote:
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"They say that life's a carousel, spinning fast you got to ride it well..." TGB Delivery Scooter 150 TMEC 200 Enduro--carcass is sadly rotting in the backyard |
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11-19-2015, 08:25 PM | #14 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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There is an 18 tooth available, although it's a little harder to find. Perhaps you'd care to start there. I think forum member Jibberwobble found them.
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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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11-19-2015, 09:08 PM | #15 |
Join Date: May 2006
Location: Yuma, Arizona
Posts: 9,055
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On my old '09 bike, I had Rebel GEARS make me a 40 tooth. It made the bike geared way too high (or low?) where I had to commute on the long 50 mph stretch in 4th gear. I then played with counter-sprockets, which are easy Honda aftermarket ones, but I never liked the gearing. I think I tried a 14 and a 15 and maybe a 16. For some reason, it seemed like that rear sprocket would rip apart chains, as I went through 3 or 4 of them. It did seem a bit narrower than the stock 56. I probably wouldn't order another custom one, but that is me and remembering the several times I was stranded with a broken chain.
For my new bike, I ordered a 48t from a place out of the UK which was the only place in Europe that would send me one to the US, as they took and trusted Paypal. That is the smallest aftermarket sprocket manufactured by JT that is a direct fit. It was easier and cheaper to use the mail order company than JT which wanted me to order via their US subsidiary who wanted to have one made and sent. Too confusing! The UK mail order place only took a week or so. It was under $50, which was about $5 cheaper than JT, and Rebel Gears. If you go with Rebel Gears, they do have the hub design, as I sent the link to JT Sprockets. I don't think JT will allow me to send the exact page, but if you link here http://www.jtsprockets.com/catalogue and put in jtr1134 in the 'parts box' they will show you a 48, 50, 52, 54, and 56 which fit all kinds of 125cc enduros/motards we don't have in the US. The place where I bought the sprocket is here http://www.urbanbike.co.uk/jtr113448...ket-1655-p.asp I think they still have my cheesy review, LOL
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"They say that life's a carousel, spinning fast you got to ride it well..." TGB Delivery Scooter 150 TMEC 200 Enduro--carcass is sadly rotting in the backyard |
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