04-27-2020, 01:43 AM | #332 |
Join Date: May 2006
Location: Yuma, Arizona
Posts: 9,055
|
You probably didn't realize it, but your RPMs were probably a bit lower. That happens with some members on dual-sports and rear sprockets; they don't get higher top speed, but the bike cruises without all the vibration and the engine at redline. The next step is rear sprocket.
__________________
"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 |
|
04-27-2020, 08:46 AM | #333 |
Join Date: Jan 2020
Posts: 38
|
Where would I look for the rear sprocket??
|
|
04-27-2020, 05:57 PM | #335 |
Join Date: Jan 2020
Posts: 38
|
What dimensions do I need to get I need to know specifics
|
|
04-28-2020, 09:44 AM | #336 |
Join Date: Nov 2017
Location: Marseille, France -> Conakry, Guinea
Posts: 1,481
|
Look at this photo so you have an idea of what measurements are needed:
You want to know the diameter of the inner hole on the sprocket as it mounts to the hub, the diameter of mounting bolts, and the diameter of the circle that the bolts form as they're mounted. The picture's pretty self-explanatory, the last measurement is analogous to the bolt pattern used on wheels. Also, metric is king, if you don't have some calipers, get some cheap harbor freight plastic ones. |
|
04-28-2020, 11:53 AM | #337 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
|
Not sure but i think your sprocket will be the same as on mu X22R from looking at the pictures. See if the dimenision match up with the JTR242 If it does then you will need to have one
custom made as the JTR242 only comes in 50 and 53 tooth. I provided a link earlier on where to order from.
__________________
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 |
|
04-28-2020, 01:11 PM | #338 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
|
So I did a little math with various sprockets and the 205/40-14 rear tire.
All figures are the mechanical speed at 8000rpm in 5th gear and a 17 tooth front sprocket. 50 rear = 52mph 45 rear = 58mph 40 rear = 65mph Just for comparison sake, a stock Hawk 15 front 50 rear and 110/100-18 tire has a mechanical top speed of 67mph at 8000rpm in 5th gear. To match a 17 front 50 rear on a Hawk this bike would need to run a 34 tooth rear sprocket. That combination would likely give a realistic top speed of around 65mph. That 14 inch rear tire is just too small to effectively gear very high.
__________________
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 |
|
04-28-2020, 01:50 PM | #339 |
Join Date: Jan 2020
Posts: 38
|
I’m actually not hitting 50mph after I installed that 17T drive sprocket, I’m hitting about 47-48 top speed now. Why did my top end speed decrease??
|
|
04-28-2020, 02:07 PM | #340 |
Join Date: Nov 2017
Location: Marseille, France -> Conakry, Guinea
Posts: 1,481
|
Is your top speed GPS verified, or is it by the gauge? Also, do you have a tachometer, is it revving as high as it was? How is your clutch adjustment, is it slipping, are your brakes dragging? There's about a million variables in play, I'd verify all of those.
|
|
04-28-2020, 02:29 PM | #341 |
Join Date: Jan 2020
Posts: 38
|
Top speed is gauge, I have no tach, yes it’s revving about the same, an no slipping , brakes are not dragging
|
|
04-28-2020, 02:47 PM | #342 |
Join Date: Nov 2017
Location: Marseille, France -> Conakry, Guinea
Posts: 1,481
|
Chinese speedometers are notoriously inaccurate. I would verify with a GPS. Having a lower top speed is physically impossible for the same RPM with the changes you've made (as your top speed isn't limited by HP), short of something slipping in a way, some of the ways having been mentioned. I would verify clutch adjustment and make 100% certain that it's not slipping.
|
|
04-28-2020, 02:59 PM | #343 |
Join Date: Jan 2020
Posts: 38
|
Ok
|
|
04-28-2020, 03:01 PM | #344 |
Join Date: Jan 2020
Posts: 38
|
How notorious would you say?
|
|
04-28-2020, 04:04 PM | #345 |
Join Date: Nov 2017
Location: Marseille, France -> Conakry, Guinea
Posts: 1,481
|
They're all inaccurate. Without using a GPS, your readings are effectively useless.
|
|
|
|
|
|