Dragon Chopper (3/4 chopper) - Page 24

Kingdiamond20 · 04-28-2020, 04:08 PM

Ok how much off

**JerryHawk250** · 04-28-2020, 04:16 PM

Examples are My Hawk stock speedometer was 5-6 mph off. I replaced it with a more accurate digital speedometer. My X22R was 10 mph off and bought a speedometer calibrator to get it dead on accurate.

Are you still running the stock exhaust and carburetor with stock jets? If you haven't tuned it or installed a free flowing exhaust the performance will be on the low end.

Kingdiamond20 · 04-28-2020, 05:34 PM

Yes it’s got stock exhaust and an stock carb parts

Megadan · 04-28-2020, 06:45 PM

Your average chinabike, regardless of who made it or what it is, is usually off about 4 to 6mph at highway speeds. Aka, if it says 60, its really doing 55ish

Kingdiamond20 · 04-28-2020, 07:21 PM

So technically doing 45mph instead of 50mph

Kingdiamond20 · 04-28-2020, 08:24 PM

What jets would you recommend??

Kingdiamond20 · 04-28-2020, 10:27 PM

Would drilling holes around the inside of the exhaust around the baffle make any difference in performance?

Megadan · 04-28-2020, 10:53 PM

Quote:

Originally Posted by Kingdiamond20

So technically doing 45mph instead of 50mph

Thats the general rule, give or take a couple MPH maybe. At 50 indicated you might be doing 46 to 48. A GPS Speedo app on your phone can help you track the difference.

Quote:

Originally Posted by Kingdiamond20

What jets would you recommend??

That depends on a lot of factors, but a good starting rule of thumb with most of these motors tends to be around a 105 main jet with no other mods at lower altitudes. Pilot jet depends on what style it has, but typically the most common sizes are 36,38, or 40. for a Keihin jet. It really helps to know your starting point to be able to make any suggestions.

Quote:

Originally Posted by Kingdiamond20

Would drilling holes around the inside of the exhaust around the baffle make any difference in performance?

Generally that can help improve flow a bit. Removing the catalysts from these bikes if often even more effective in terms of opening up their breathing.

Kingdiamond20 · 04-28-2020, 10:56 PM

O ok ty sir

Kingdiamond20 · 04-28-2020, 10:58 PM

How would I remove the baffle it’s got rivets on the outside and if so do the holes were the rivets were need to be covered ?

Kingdiamond20 · 09-22-2020, 03:18 PM

What’s the size of the rear sprocket on the Df250rtf villain chopper???

Kingdiamond20 · 09-22-2020, 05:28 PM

I’m wanting to downgrade for more top end speed

04-28-2020, 04:16 PM	#347
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,549	Examples are My Hawk stock speedometer was 5-6 mph off. I replaced it with a more accurate digital speedometer. My X22R was 10 mph off and bought a speedometer calibrator to get it dead on accurate. Are you still running the stock exhaust and carburetor with stock jets? If you haven't tuned it or installed a free flowing exhaust the performance will be on the low end. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 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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04-28-2020, 06:45 PM	#349
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,968	Your average chinabike, regardless of who made it or what it is, is usually off about 4 to 6mph at highway speeds. Aka, if it says 60, its really doing 55ish __________________ 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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04-28-2020, 04:08 PM	#346
Kingdiamond20 Join Date: Jan 2020 Posts: 38	Ok how much off
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04-28-2020, 05:34 PM	#348
Kingdiamond20 Join Date: Jan 2020 Posts: 38	Yes it’s got stock exhaust and an stock carb parts
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04-28-2020, 07:21 PM	#350
Kingdiamond20 Join Date: Jan 2020 Posts: 38	So technically doing 45mph instead of 50mph
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04-28-2020, 08:24 PM	#351
Kingdiamond20 Join Date: Jan 2020 Posts: 38	What jets would you recommend??
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04-28-2020, 10:27 PM	#352
Kingdiamond20 Join Date: Jan 2020 Posts: 38	Would drilling holes around the inside of the exhaust around the baffle make any difference in performance?
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04-28-2020, 10:56 PM	#354
Kingdiamond20 Join Date: Jan 2020 Posts: 38	O ok ty sir
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04-28-2020, 10:58 PM	#355
Kingdiamond20 Join Date: Jan 2020 Posts: 38	How would I remove the baffle it’s got rivets on the outside and if so do the holes were the rivets were need to be covered ?
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09-22-2020, 03:18 PM	#356
Kingdiamond20 Join Date: Jan 2020 Posts: 38	What’s the size of the rear sprocket on the Df250rtf villain chopper???
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09-22-2020, 05:28 PM	#357
Kingdiamond20 Join Date: Jan 2020 Posts: 38	I’m wanting to downgrade for more top end speed
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