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01-29-2016, 01:49 PM | #1 |
Join Date: Aug 2015
Location: Buenos Aires, Argentina
Posts: 30
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Open Service Shop in Argentina
Around a month ago a local distributor invited RX3 owners to show us a complete bike service, including valve adjustment.
They gave a free service for 2 of the bikes, unfortunately not mine. One of the things they told us is that they adjust to 0,10 the valves clearance that is much higher than the values I can read at this forum. You can see some pictures of the event and a video in their facebook. In the pictures I´m the second guy from the left. This is a link to the work shop video ... https://www.facebook.com/zmotos/vide...type=2&theater
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Pablo. Today Riding a Corven Triax 250 Touring (Zongshen RX3) |
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01-29-2016, 10:15 PM | #2 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Zongshen recommends setting the valve lash for all four valves at 0.04-0.06 millimeters. I personally set the valve lash to 0.08 mm for all four valves in my RX3 engine. Setting the valve lash to 0.10 mm is a little too large, but it shouldn't cause any problems, other than a minor loss of power.
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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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02-01-2016, 12:03 PM | #3 | |
Join Date: Oct 2015
Location: Seattle/Tacoma
Posts: 104
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02-01-2016, 02:40 PM | #4 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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I haven't noticed any power loss by setting the valve lash a little on the loose side, and I prefer to have the valves adjusted a little too loose, rather than a little too tight. Also, setting the valve lash to 0.08 mm gives me an additional safety margin to avoid tight valves, in case I am a little delayed with my valve inspection, or the valve seats more quickly than usual. Finally, I believe I read somewhere that CSC sets the valve lash to 0.08 mm at the dealership before they ship the new bikes.
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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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02-01-2016, 04:10 PM | #5 | |
Join Date: Oct 2015
Location: Seattle/Tacoma
Posts: 104
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02-01-2016, 09:15 PM | #6 | |
Join Date: Oct 2015
Location: FL, GA, NC
Posts: 771
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Quote:
He said that during the CSC "setup", the valve clearances are set to .003" jb
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2016 Honda CB500F......2017 Triumph Street Twin 2014 XT 250........ |
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02-02-2016, 12:25 AM | #7 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Thank you, I read the information from one of your posts. A valve lash of .003 inches is equal to .0762 millimeters.
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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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02-01-2016, 02:21 PM | #8 | |
Join Date: Oct 2015
Location: White Mtns. NH
Posts: 488
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Quote:
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2016 Versys 650 LT, 2015 RX3 Red, 2011 Ural GearUp, |
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02-01-2016, 08:57 PM | #9 |
Join Date: Jul 2015
Location: Milpitas, CA. USA
Posts: 775
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OHC rocker clearance
Keith, from my experience on Honda OHC engines with rocker arms they ranged from .002" intake .004" exhaust to only .002" on both. This was on models from 50cc up through 750cc. The little pushrod engines were always larger than that. So perhaps with advances in metallurgy and forming processes, things have only improved to allow makers like Zongshen to reduce tolerances.
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02-02-2016, 10:46 AM | #10 | |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Quote:
I learn stuff on this forum every day.
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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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02-02-2016, 11:18 PM | #11 | |
Join Date: Jul 2015
Location: Milpitas, CA. USA
Posts: 775
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Quote:
In that vein, a 3" long pushrod will lengthen about .006" at 200F. The distance from the cam to the rocker end will also grow, but as various metals will run plus or minus to the general rule, the maker will undoubtedly determine actual recommended tolerance after running a number of practical tests. Now for overhead cam (OHC) applications it would be a bit different. The cam lobe and valve stem will expand which should reduce the cold set clearance. However the rocker arm pivot hole will also enlarge (get more sloppy) and give some clearance back. On our engines with the roller type cam follower there is also slight sloppiness. So tight is not good as it can give grief to the valve face. Loose is not good as it reduces amount of valve lift while also reducing duration, but that only affects performance. It also creates an impact that can defeat the thin oil film that would normally cushion the contact between the cam and follower, and again between the valve stem and the valve lifting end of the rocker arm. Darn, got sidetracked and forgot what I was going to say. Oh, just remembered, I had pudding for dessert. |
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02-01-2016, 04:12 PM | #12 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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Thanks for the kind words, amigo. To be more accurate, I place a 0.08 feeler gauge under the tappet as I tighten the lock nut. Usually, when I check the valve lash, it has been set to 0.08 mm. Sometimes I tighten the lock nut a little too much, and the valve lash might end up a little tighter, perhaps closer to 0.06 mm. In that case I don't bother to loosen the lock nut. I am within specifications, so I close everything up and finish the job.
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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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