02-17-2015, 03:00 PM | #16 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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You're welcome. There is a rev limiter built into the CDI, but I wouldn't want to defeat it. You can buy a no-rev limit CDI, but these pushrod motors have only so much potential. Believe it or not, there is only one cam lobe, and it bumps both valves. That means that neither valve can be optimized for lift or duration, but it's a wonderful motor for low end grunt and longevity.
Since most of these machines are lean from the factory, you're likely just running out of fuel at the top end. Fattening it by two sizes will likely produce results. The Mikuni will have the wrong jets for your application, but they're cheap and plentiful. It will have a 100 main and a 20 slow jet. I'd recommend a 110 main, and at least a 25 slow if you're at any amount of elevation. If you're at sea level, try a 30 slow jet.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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02-17-2015, 03:00 PM | #17 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Awesome screen name, BTW.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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02-17-2015, 05:25 PM | #18 |
Join Date: May 2007
Location: Altamont, Kansas
Posts: 15,103
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I would also replace the sparkplug with an NGK.
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02-17-2015, 10:30 PM | #19 |
Join Date: May 2006
Location: Yuma, Arizona
Posts: 9,056
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X2 ^^
I can't remember if you wrote you changed it, but the plug is an easy, low-cost part. I should also mention, try some of the Bashan 250 enduro threads from about 2 or 3 months ago. Those guys had problems with their gas leaking out (all over them) on throttle, and they were looking into cap/pressure issues. Not sure if they ever got their problem resolved, but if they did, you can see what they did, or ask them. Your bike might incorporate the same engine as theirs, if not being manufactured by the same company (it's a Chinese thing playing 'who is the manufacturer')
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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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02-17-2015, 10:39 PM | #20 |
Join Date: May 2006
Location: Yuma, Arizona
Posts: 9,056
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Look through these threads
http://chinariders.net/showthread.php?t=13950 http://chinariders.net/showthread.php?t=14256 http://chinariders.net/showthread.php?t=13928 Again, not sure if the bikes are related, or at least the engines, but I remember there being a tank/gas cap issue in a couple of the threads.
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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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02-18-2015, 10:39 AM | #21 |
Join Date: Jan 2015
Location: Texas
Posts: 32
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Stock Mikuni jets seem to be working well for me in Fort Worth. But I am trail riding my Apollo 250 with a similar engine. the new carb made a huge difference on my bike.
Also adjust the valve lash, and replace the spark plug.
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02-18-2015, 06:36 PM | #22 |
Join Date: Feb 2015
Location: Dallas, Texas
Posts: 9
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Thanks for all the information and suggestions. I just ordered a new Mikuni carb and NGK plug today. I will let you know how it works out.
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03-12-2015, 09:57 PM | #23 |
Join Date: Mar 2015
Location: Cedar City Utah
Posts: 41
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I just Bought 2 of these myself (still waiting for them to arrive.) I will be following this thread and many others I am sure.
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03-12-2015, 09:59 PM | #24 |
Join Date: Mar 2015
Location: Cedar City Utah
Posts: 41
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I did as much research as I could before my purchase and the info I have is that it is a 229 cc engine and the basic bike is a Yamaha TT 225 clone
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03-13-2015, 09:58 AM | #25 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Welcome! The engine could be 223 or 229, but it doesn't make much difference. When you receive your bikes, please start a thread and show us pics.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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09-29-2015, 11:46 PM | #26 | |
Join Date: Sep 2015
Location: Foley AL
Posts: 10
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Hawk 250
Quote:
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10-20-2015, 10:40 PM | #27 |
Join Date: Oct 2015
Posts: 4
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Hello all !! I recently bought a 2015 haosen hs250y-a hawk 250 from apscusa.com . I have been reading everyone's threds . I'm having similar issue's I'm only getting 55 to maby 60 mph all the way wound out ! And it feels like its not getting enuff fule . I found a like to eBay here to a new makuni carb . definitely gonna get one of those , I think that should help a lot . my other issue is I'm trying to find a place to get new front and rear sprockets the rear had a 53 tooth not shure on the front sprocket yet I need to pull the front cover off and count the teeth . I'm trying to get a little more top end speed with out reving the hell out of the thing ! Any help or suggestions would be greatly appreciated !! Thanks
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10-20-2015, 11:08 PM | #29 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Welcome, Corey!
The Mikuni will only be a benefit if you plan mods to the air cleaner or exhaust. Otherwise, if it starts and runs well, leave that part alone. The sprockets are the biggest issue. 53 is really low; let us know what size your front sprocket is.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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10-20-2015, 11:08 PM | #30 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Sweet bike! Please start a new thread on it.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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