05-22-2020, 10:27 PM | #436 |
Join Date: Feb 2007
Posts: 1,357
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Found a rear sprocket for a 428 that might fit the rear wheel of our DF250RTG.
I will order a 35 tooth and will see if it will fit. https://www.amazon.com/JT-Sprockets-...TTRC0JQCSTWQCT Now to find my chain break tool. |
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05-23-2020, 01:34 AM | #437 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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All the same sprockets the Hawk 250's use. If you wanted a 520 chain setup a JTF328 sprocket would take care of the engine side. Just a random tidbit of info.
I am actually quite amazed at how tall they geared those things. I agree with Barnone. Gearing is fine where it is. If you absolutely must gear the bike up some more, I wouldn't go beyond a 36 rear sprocket.
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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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05-23-2020, 10:00 AM | #438 | |
Join Date: May 2020
Posts: 17
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05-23-2020, 12:48 PM | #439 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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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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05-23-2020, 07:01 PM | #440 |
Join Date: Nov 2017
Location: Marseille, France -> Conakry, Guinea
Posts: 1,481
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What is it revving to? Honda had two separate primary drive ratios, and I'm certain they use the lower ratio for Chinese utility vehicles (4.05 vs ~3.33), perhaps they're using them in this motor?
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05-23-2020, 07:44 PM | #441 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Pretty much every dual sport bike uses the same 3.33 primary ratio as does most of the "250" street bikes.
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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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05-24-2020, 07:04 AM | #442 | |
Join Date: May 2020
Posts: 17
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05-25-2020, 03:17 PM | #444 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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In my opinion, these bikes could gain a couple of teeth out back, but that's me lol.
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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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05-25-2020, 10:27 PM | #445 |
Join Date: Feb 2007
Posts: 1,357
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I am going the other way by reducing the number of teeth by three. If the sprocket fits then I will do some "high" speed runs and check the max RPM with my mini tach and the max MPH with my speedometer app on my cell phone. Then I will swap the stock sprocket back on an compare the results.
Edit: Not going to swap the 38 tooth rear back on, too much trouble. LOL Last edited by Barnone; 05-27-2020 at 08:30 AM. Reason: Lazy |
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05-26-2020, 10:11 AM | #446 |
Join Date: Sep 2016
Location: Texas
Posts: 165
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Whats the shipping weight? Two guys should be able to lift onto a little harbor freight trailer, you think?
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05-26-2020, 10:20 AM | #447 | |
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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 |
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05-26-2020, 01:16 PM | #448 | |
Join Date: Feb 2007
Posts: 1,357
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Mine when I uncrated it several years ago. Angle iron crate in the background. It was covered in cardboard so if you remove the cardboard you will have better places to grip it. |
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05-26-2020, 06:37 PM | #449 |
Join Date: Feb 2007
Posts: 1,357
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The 428 35T sprocket came in a day early so I installed it this afternoon. Luckily I didn't need to shorten the chain. The stock one is stamped on the back as a 428 38T so my tooth counting was right.
Took the DF out for a short ride and she can stay in first gear longer and pulls just fine. I will take her out for some higher speed run tomorrow after I check my install. A better test will come later when I get her up in the mountains of Western NC. I weigh 200 so you lighter guys might wanna go with a 34 tooth 428 sprocket. 38/17 is 2.23 stock 35/17 is 2.06 34/17 is 2.00 |
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05-26-2020, 06:41 PM | #450 |
Join Date: Feb 2007
Posts: 1,357
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I have changed the rear sprocket to a lower tooth count or the front to more teeth on almost all my bikes in the past with satisfactory results. The DF250RTG seems to like the less teeth rear sprocket just fine.
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