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01-03-2018, 02:56 PM | #1 |
Join Date: Oct 2016
Location: New Smyrna Beach, Florida
Posts: 91
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17/40 gearing on TT250
Well since I can't leave anything alone and my riding is entirely on the pavement I decided to install a 40 tooth rear sprocket and I am actually pretty happy with the results. While it doesn't like the wind much on the top end when the wind isn't a factor it performs really well especially in city driving. Last night I took it on the freeway and without the headwind and in traffic it actually hit 73 mph at about 7300 rpm and was able to maintain 66-68 mph when I was alone in the gusty conditions which I think is pretty good since I weigh 250 lbs.
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2016 CSC TT 250, 17/40 sprockets, JT 428 chain, Stock Keima carburetor with needle raised 1 notch and 115 main jet. Modified stock exhaust, Tachometer/Digital cluster upgrade. LED headlight, Superbrightleds 1157 Tail light bulb, Shinko 705's 90/90-21 and 120/80-18. |
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01-03-2018, 03:01 PM | #2 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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I tried a 17/39 with my 120/80-18 tire (similar to a 17/40 on a stock tire). I had similar results to you, but I didn't find my bike to like steep hills very much, so I went back to a 43 rear. I guess that is less of a problem in Florida though. You should track your fuel economy with those gears to see if it makes a difference.
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Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124 |
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01-03-2018, 08:28 PM | #3 |
Join Date: Oct 2016
Location: New Smyrna Beach, Florida
Posts: 91
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It's been really windy here so I'm sure that has had an effect on things but I really only noticed it when I was riding into a head wind so it knocked it down to about 58 mph but on the return trip I was able to maintain 66-68 mph with a max of 73 when in traffic. When I took the secondary road with a 55 mph speed limit it easily maintained 58-60 mph with some throttle left so it will be interesting to see how it performs when it's not battling storm gusts. As far as mileage goes I've consistently gotten around 47-50 mpg with this bike since I've had it so it will be interesting to see if it has any major effect on fuel mileage. There may be more experimentation on the horizon because when I was browsing on amazon the other day I scored a 42 tooth sprocket for $10 with free shipping because I have Prime. At that price I had to pick it up even if I just save it for a spare....lol.
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2016 CSC TT 250, 17/40 sprockets, JT 428 chain, Stock Keima carburetor with needle raised 1 notch and 115 main jet. Modified stock exhaust, Tachometer/Digital cluster upgrade. LED headlight, Superbrightleds 1157 Tail light bulb, Shinko 705's 90/90-21 and 120/80-18. |
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01-04-2018, 09:32 PM | #4 |
Join Date: May 2006
Location: Yuma, Arizona
Posts: 9,055
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I had a TMEC 200 and went to a 40 rear (17 stock countersprocket). Not the best idea, thinking back. I never measured top speed on GPS, and the speedo was long broken, but I kept having to put it into 4th on windy days to keep up with traffic, or to not hold back traffic (50 MPH posted but cross-border traffic running at 60+). I would probably have preferred a 42 or 44. It seems like you are getting better results with your larger engine and any modifications. My 196cc Zongshen was bone stock.
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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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01-22-2018, 10:13 PM | #5 | |
Join Date: Oct 2016
Location: New Smyrna Beach, Florida
Posts: 91
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Quote:
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2016 CSC TT 250, 17/40 sprockets, JT 428 chain, Stock Keima carburetor with needle raised 1 notch and 115 main jet. Modified stock exhaust, Tachometer/Digital cluster upgrade. LED headlight, Superbrightleds 1157 Tail light bulb, Shinko 705's 90/90-21 and 120/80-18. |
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01-22-2018, 11:38 PM | #6 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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The 17/40 combination is definitely the most highway friendly gearing, but I still much prefer the 17/43 after having ridden both. I will sacrifice the 400rpm drop at 60mph for the slight little extra bit of pulling power. In any case, it sounds like it suits you and your needs very well.
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Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124 |
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01-23-2018, 08:29 AM | #7 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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Roger,
I'm running the 40 tooth on the rear. The 17 works great for just highway riding. I run a 16 tooth on front most of the time due to I tend to leave the hard roads for off road riding. 16/40 is a good all around combo especially if there are no hills. I switch to the 15 tooth if I'm running strictly off road and if on hilly trails. The front sprocket is a quick and easy swap compared to changing the rear. I would just buy a 15 and 16 tooth front and not mess with the rear sprocket.
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel Last edited by JerryHawk250; 01-23-2018 at 09:15 AM. |
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01-24-2018, 10:54 AM | #8 | |
Join Date: Feb 2017
Location: Holiday, Florida
Posts: 672
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Quote:
Enjoy the ride!
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Dan-O -2018 Tao Tao HellCat - DOA -2016 Hawk 250 - Kitty Hawk - eBay exhaust, Mikuni carb(120 main/30 Pilot), airbox mod with K&N filter, digital cluster, total LEDs, 17/45 sprockets, RK chain, Shinko 244 tires, trunk, aftermarket levers, burrito tube, skid plate, Sargent Cycle Seat... -2003 HD Sportster 100th Anniversary -1999 Buell X-1 Lightning - Race kit, Buell Seat |
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01-24-2018, 12:16 PM | #9 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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No, due too there's not a big difference in diameter in sprockets.
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel Last edited by JerryHawk250; 01-25-2018 at 09:54 AM. |
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