10-27-2014, 08:45 PM | #1 |
Join Date: Sep 2014
Location: Santa Cruz, CA
Posts: 40
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Oil leak/exhaust backfire
Took about a week off riding. I took my viva out today, started up fine. Rode around for about 20 mins at low speeds until I got to a backroad highway. I was going about 40mph I felt the exhaust backfire. If I rev pass 6000rpms in any gear it will backfire. Got back home and I noticed oil leaking out it the crankcase cover.
Just wondering what could be causing the backfire and oil leak? Would both be related problems? Assuming I have to change the gaskets? |
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10-27-2014, 08:47 PM | #2 |
Join Date: Sep 2014
Location: Santa Cruz, CA
Posts: 40
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Leak coming from the seam
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10-27-2014, 10:59 PM | #3 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Is the leak coming from the cylinder base gasket?
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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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10-28-2014, 12:23 AM | #4 |
Join Date: Sep 2014
Location: Santa Cruz, CA
Posts: 40
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Just the front right side of the cylinder base. (First pic)
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10-28-2014, 12:33 AM | #5 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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The oil leak is not causing the engine to backfire. However, a loose exhaust header can cause an engine backfire on deceleration.
Try tightening the cylinder bolts. If that doesn't stop the leak, you will need to replace the cylinder base gasket, and since you need to remove the cylinder head, you will need to replace the cylinder head gasket as well.
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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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10-28-2014, 12:54 AM | #6 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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I agree with Spud's comments.
When it backfires, is it only when you close the throttle, or also when wide open?
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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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10-28-2014, 04:13 AM | #7 | |
Join Date: Sep 2014
Location: Santa Cruz, CA
Posts: 40
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Quote:
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10-28-2014, 04:18 AM | #8 |
Join Date: Sep 2014
Location: Santa Cruz, CA
Posts: 40
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Mostly as I am opening the throttle around 6000rpms. It doesn't backfire as often during deceleration
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10-28-2014, 11:06 AM | #9 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Would you also describe it as surging / hesitating? Is it relatively quiet, or does it make a big bang?
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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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10-28-2014, 12:47 PM | #10 |
Join Date: Sep 2014
Location: Santa Cruz, CA
Posts: 40
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More so hesitating, relatively quiet as I'm reaching 6000rpms, if I persist it will make a louder pop rather than a big bang
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10-28-2014, 03:16 PM | #11 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Have you done any troubleshooting? New spark plug? New fuel filter?
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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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10-28-2014, 04:22 PM | #12 |
Join Date: Sep 2014
Location: Santa Cruz, CA
Posts: 40
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I have a new fuel filter, haven't replaced the spark plug yet. I'll try to replace it sometime today or tomorrow. Gonna see if any local shops carry the same spark plug
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10-29-2014, 12:55 AM | #13 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Should be really easy to find a replacement NGK. Is there an NGK in there now?
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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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10-29-2014, 01:05 AM | #14 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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I agree; I would replace the current spark plug with the NGK equivalent.
__________________
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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10-29-2014, 10:04 PM | #15 |
Join Date: Sep 2014
Location: Santa Cruz, CA
Posts: 40
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The previous spark plug was an NGK. Replaced it with a new one and still got hesitant "coffing" from the exhaust during acceleration. I took off my fmf slip on exhaust to see if that would rule out anything. Rode around and still got hesitating around 6000rpms mainly in 5th gear followed by coding/backfire and it seems like the engine is hesitating at or above those rpms.
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