10-24-2014, 01:02 PM | #1 |
Join Date: Mar 2014
Location: Mexico
Posts: 134
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Replacing gaskets
Hi, , I need to replace the leaking gaskets (cylinder head and cylinder) but I am not sure if draining oil before taking off the cylinder head is needed. Screws at the cylinder head are loose and learned that oil is leaking slowly since I cleaned an oil spot under the bike. I know Spud drained the oil when rebuilding the engine but not sure if needed when doing the cylinder gaskets.
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Hector Mountrack Vento 2006 |
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10-24-2014, 08:50 PM | #2 |
Join Date: Jun 2011
Location: Sioux Falls, SD
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If it were me, I would drain the oil. Oil is cheap and you probably need an oil change any way!
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10-24-2014, 10:27 PM | #3 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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It isn't necessary to drain the engine oil when removing the cylinder and cylinder head, either to rebuild the top end of the engine, or to replace gaskets. However, I suggest you try tightening the bolts first; you might stop the leaks without the need to replace the gaskets.
Use a torque wrench when tightening the bolts. You can find the torque specifications in the the Yamaha TW200 Service Manual, which you can download at the following link. http://api.viglink.com/api/click?for...0Manual%20(PDF)
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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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10-27-2014, 10:44 AM | #4 |
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Location: Sardis, BC, Canada
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I agree with Spud; just try tightening the fasteners first. Please let us know the result.
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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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11-02-2014, 11:45 PM | #5 | |
Join Date: Mar 2014
Location: Mexico
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Quote:
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Hector Mountrack Vento 2006 |
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11-03-2014, 12:05 AM | #6 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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You can probably save a lot of money by purchasing a complete gasket set from Taobao.
http://item.taobao.com/item.htm?spm=...cket=19#detail
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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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12-26-2014, 10:09 PM | #7 |
Join Date: Mar 2014
Location: Mexico
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Hi guys, long time I haven´t post it here. I have time to do the top end rebuild but I can´t remove the bolts. I follwed Spud´s advice but the bolt won´t go any futher (see the pic). I don´t want to remove the engine, please help.
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Hector Mountrack Vento 2006 Last edited by hect75; 12-27-2014 at 02:00 AM. |
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12-27-2014, 01:19 AM | #8 |
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Location: Idaho
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If you reduce the photograph in size by 50%, it will be much easier for us to view it.
I suggest you remove the nuts from the ends of all four bolts. Then remove the difficult bolt last. You can tilt the cylinder, if necessary.
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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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12-27-2014, 01:58 AM | #9 |
Join Date: Mar 2014
Location: Mexico
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I will try, Thanks Spud.
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Hector Mountrack Vento 2006 |
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12-31-2014, 11:55 PM | #10 |
Join Date: Mar 2014
Location: Mexico
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I had to remove the engine because I learned that bolts have a flange (not sure if about the right name) on the low position. This made it impossible to remove it (sorry for the crappy pic).
Then, I remove the engine and found valves are dirty piston same as valves Also I found a hole in the cylinder head (upper right side). Probably, this is affecting the performance of the engine and don´t know if the hole must be fixed. Finally, I went to the shop asking about rebor and the machinist said yes but will do it until next Monday due to holidays. Feedback is welcome.
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Hector Mountrack Vento 2006 |
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01-01-2015, 12:48 AM | #11 |
Join Date: Jul 2008
Location: Idaho
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I don't see a hole in the cylinder head. Are you talking about the chip/indentation located at 1 o'clock in the photograph below?
If you actually have a hole, you can patch it with JB Weld, et cetera. Otherwise, you don't have any problems. Have the machinist bore and hone the cylinder to match the smallest oversize piston you can find. You can order a piston for the Yamaha TW200. Besides the oversize piston, I suggest you order new piston rings, gaskets, and valve stem seals. I also suggest you have the machinist clean the cylinder head, and lap the valves for you.
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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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01-01-2015, 02:26 AM | #12 | |
Join Date: Mar 2014
Location: Mexico
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Quote:
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Hector Mountrack Vento 2006 |
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01-01-2015, 03:03 AM | #13 |
Join Date: Jul 2008
Location: Idaho
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All the parts are TW200 parts. Every recent model year of the TW200 should be fine, but you can select 2006, Yamaha TW200 parts, if you like. I would also order a new piston/wrist pin.
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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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01-01-2015, 04:23 PM | #14 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Is the cylinder scored? Is there a ridge at the top that you can catch with a fingernail? If no, then you might not need to bore the cylinder. Just buy a cylinder hone (meant for an automotive master cylinder) and hone it as is. Install new rings and gaskets and enjoy the bike.
It's rare to need to bore a motorcycle cylinder, until there are several thousand miles 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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01-01-2015, 04:27 PM | #15 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
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That might just be an oil drain-back hole.
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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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