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#1 |
Join Date: Jun 2019
Posts: 12
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So bought new tt250 nice bike but having one issue basically when you try to give it 1/2 throttle or more the bike misses as it climbs through the rpm range if you feather it all the way through no missing only half throttle
Or more csc has been helpful sent me coil and new computer for the coil still same problem my First thought was fuel and I’m still leaning towards this being The issue any ideas? New to the forum thank you so Much |
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#2 |
Join Date: Jun 2016
Location: Hell
Posts: 2,408
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Have you checked valves? This might help a little
Second thing is tune the carb or look into carb check jetting that’s actually in it I do have a set listed in my eBay store for first tune, this might be useful to you. So you changed the CDI and coil? Any color smoke when it plays up? |
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#3 |
Join Date: Jun 2016
Location: Hell
Posts: 2,408
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Do you have a timing light? See if it’s loosing spark when it plays up etc
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#4 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,656
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Also try a new plug. The one that came on the bike may be defective or cracked. I agree, valve lash would be one of the first things to check.
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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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#5 |
Join Date: Jun 2019
Posts: 12
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Thank you both for response so the valves are due in the next 40 miles so I’ll be doing them this weekend yes replaced both under warranty and also spark plug was the first thing I did to see and no improvement with all three those parts replaced. Changed the oil already bike is about to hit 500
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#6 |
Join Date: Jun 2019
Posts: 12
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Also idk what size jets are in it that’s was my thought maybe needs a different main
Jet since it’s only 1/2 throttle or more I’m not to well with carbs but I’m Decent with cars etc so |
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#7 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,656
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Try adjusting the idle mixture. It may be set to lean. Once you have the idle mixture set and it still does it then you can raise the needle up one notch.
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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; 06-07-2019 at 07:52 AM. |
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#8 | |
Join Date: Jun 2016
Location: Hell
Posts: 2,408
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Quote:
Valve adj set, first tune set, carb air screw adjuster all could be useful to you I’m in the USA Saturday and have some products with me or it be 2ish weeks before I’m back If you’re lucky I might be passing thru your area if you’re west coast lol I have some items to drop off to customers already and it’s not the first time I’ve deluverrd in person |
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#9 |
Join Date: Jun 2019
Posts: 12
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Ok I’ll check it out. Do I have to take the carb off to change the idle mixture ? Think the older models don’t have screw but I believe mine does
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#10 | |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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Quote:
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#11 |
Join Date: Jun 2019
Posts: 12
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Ok yea I agree that’s its probably to lean do I need to take the carb apart to fix that ? And if so do
I just move the needle or change the jets thank you all for the responses just trying figure out the best way to go about it when I take the bike apart |
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#12 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,656
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The stock carb does have an idle mixture screw. It may be covered by with a plastic or brass cap that can be drilled out. It will be hard to adjust while on the bike but can be done. You want to adjust the idle mixture after the engines up to running temperature.
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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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#14 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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I actually agree with the choke comment. Make sure the choke is all the way off (open). If you only have it in the half choke position it will behave almost exactly as you describe.
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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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#15 |
Join Date: Dec 2015
Location: CO
Posts: 1,525
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This might also be helpful if you have to actually open up the CSC carb for cleaning or needle adjustments
https://www.cscmotorcycles.com/check...or-maintenance
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tt250 help |
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