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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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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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) |
I agree with Spud; just try tightening the fasteners first. Please let us know the result.
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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 |
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.
http://i123.photobucket.com/albums/o...1.jpg~original |
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. ;) |
I will try, Thanks Spud.
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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).
http://i123.photobucket.com/albums/o...2.jpg~original Then, I remove the engine and found valves are dirty http://i123.photobucket.com/albums/o...a.jpg~original piston same as valves http://i123.photobucket.com/albums/o...8.jpg~original http://i123.photobucket.com/albums/o...6.jpg~original 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. http://i123.photobucket.com/albums/o...0.jpg~original Finally, I went to the shop asking about rebor and the machinist said yes but will do it until next Monday due to holidays. http://i123.photobucket.com/albums/o...e.jpg~original Feedback is welcome. |
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?
http://i123.photobucket.com/albums/o...0.jpg~original 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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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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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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