06-18-2011, 08:34 PM | #1 |
Join Date: Jan 2011
Location: mechanicsburg pa
Posts: 170
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hesitation and back fires
when down shifting my bike seems to be back firing alot more and when when you get back on the throttle it hesitates , if completely stopped sometimes it stalls. I was coming to a stop sign almost stopped and starting to turn i hit the throttle the engine stalled and the bike hit the ground and I was scrambling to get the bike back up before anyone saw ;three week ago I had a new spark plug air cleaner and what ever the first service gets
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06-18-2011, 11:32 PM | #2 |
Join Date: Mar 2009
Location: Southeastern Washington desert
Posts: 14,761
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Glad you and the bike are OK.
Please remind us. You ride a Q? What modifications if any?
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06-19-2011, 12:04 AM | #3 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
Spud
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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06-19-2011, 04:59 AM | #4 |
Join Date: Jan 2011
Location: mechanicsburg pa
Posts: 170
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09 qlink stock, when I say back fire I dont mean not real loud just popping most of the time, but under bridges its pretty loud
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06-19-2011, 12:06 PM | #5 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Perhaps the main jet in your carburetor is too rich. At what elevation are your riding, and what is the size of your current main jet?
Spud
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Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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06-20-2011, 03:05 PM | #6 | |
Join Date: Jan 2011
Location: mechanicsburg pa
Posts: 170
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Quote:
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06-20-2011, 03:34 PM | #7 |
Join Date: Mar 2009
Location: Southeastern Washington desert
Posts: 14,761
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I don't recall a misjetted, much less rich Q ever in factory configuration. Plugged air filter maybe?
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06-21-2011, 01:15 AM | #8 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Maybe the reed valve in the smog device (if equipped) isn't seating. That would allow too much oxygen to hit the exhaust.
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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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06-21-2011, 07:46 AM | #9 |
Join Date: Jan 2011
Location: mechanicsburg pa
Posts: 170
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[quote="Weldangrind"]Maybe the reed valve in the smog device (if equipped) isn't seating. That would allow too much oxygen to hit the exhaust.[/quo
thanks for the tip what can i do about that |
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06-21-2011, 10:21 AM | #10 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Toss it in the trash and make a block-off plate, unless you live in the PRK. If your municipality or State requires that you keep such a ridiculous device, then get crafty about disabling it.
Once removed, the catalytic converter could be removed as well.
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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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06-21-2011, 02:22 PM | #11 |
Join Date: May 2011
Location: Michigan
Posts: 2
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Replacing the CDI fixed mine
My bike was cutting out and misfiring in the high gears and would random stall at stops. I replaced the CDI box (under the seat) and it fixed it. The part was cheap, but make sure you get the correct connector type.
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06-21-2011, 03:08 PM | #12 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Re: Replacing the CDI fixed mine
Quote:
Spud
__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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06-21-2011, 10:44 PM | #13 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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I agree that a bad CDI can cause misfiring, but this symptom is more likened to back-firing, if I'm understanding correctly. My leading theory is still that it's an air / fuel issue, however it's caused.
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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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06-22-2011, 01:26 AM | #14 | |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Quote:
Spud
__________________
Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894 |
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06-29-2011, 11:13 AM | #15 |
Join Date: Jan 2011
Posts: 119
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Idle jet can be lean. These bikes dont have accelerator pumps to give that extra shot of gas when you open throttle quickly.This leaves you with a 1/10th second of very lean mixture. not a problem if its correct to begin with but your idleing with a hot motor and you jump on the gas giving the motor a big gulp of fresh air but still that tiny idle jet of fuel, then the fuel begins to get sucked out the jets like its supposed to.
We are dealing with really tiny motors, they can be real picky about carburation... check your idle screw settings.maybe go 1/2-3/4 turn out. what altitude are you at? |
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