04-27-2016, 11:23 PM | #76 |
Join Date: Sep 2014
Location: Arvada, CO
Posts: 1,004
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Wow, what a story! That's awesome that CSC took care of you!
I'm curious, did Gerry say why he recommended 20w-50 oil? The normal viscosity is 10w-40.
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Red 5 standing by! 2015 CSC red RX3 with 19" front wheel, Shinko 804/805, skid plate, tall seat, 13T/45T sprockets, progressive shock, Winyoochanok windshield, GENSSI LED headlight, SW-Motech tankbag, Shorai Lithium battery 2014 Ural Patrol |
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04-27-2016, 11:36 PM | #77 | |
Join Date: Oct 2015
Location: FL, GA, NC
Posts: 771
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I don't know if the recommendation is because I'm in hot Florida. I thought 20w50 was for air cooled engines, but I will follow his recommendation. jb
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2016 Honda CB500F......2017 Triumph Street Twin 2014 XT 250........ |
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04-27-2016, 11:45 PM | #78 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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I think you are correct. Gerry probably recommended the 20W/50 motor oil because you are in sunny, warm Florida.
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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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04-27-2016, 11:47 PM | #79 |
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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X2; I'm glad your problem is fixed, and I think it's great that CSC treated you so 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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04-28-2016, 12:05 AM | #80 |
Join Date: Jul 2015
Location: Milpitas, CA. USA
Posts: 775
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Decompressed
JB asked if a 250 really needs a decompressor.
By reducing the effort needed to start the engine, the parts that are used to start it can be designed to be lighter or don't need to be bulky (in the case of kick starters) or use less energy (electric starters). It's all part of the game of saving ounces. |
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04-28-2016, 12:10 AM | #81 | |||
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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I also recommend setting the valve lash to 0.08 mm for all four valves. This setting doesn't adversely affect engine performance, and provides a little more safety margin between valve lash inspections.
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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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04-28-2016, 06:24 AM | #82 |
Join Date: Mar 2016
Location: Scotland
Posts: 21
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You saying that the roller on the rocker arm wore away the cam at the base ?
Poor surface hardening treatment would be my first thought. Your explanation seems to be that the cam was so worn that the rocker arm roller was making contact with the decompresser finger and causing the bob weight to rattle about and make your noise. No clearance would have affected your starting and running and any wear would normally take place at the tip of the cam. I still think it was a poor quality part that was your problem, ask Honda, they know about cam problems. |
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04-28-2016, 09:01 AM | #83 | |
Join Date: Oct 2015
Location: FL, GA, NC
Posts: 771
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Gerry said the surface of the cam lobe was worn away all the way around the lobe, and that he had never seen that condition before. I am not fully satisfied with the explanation of the cause of the problem. That is why I wanted the worn cam returned, or a least a photo of the damage. But I am overjoyed that the bike is fixed, and I'm back on the road again. jb
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2016 Honda CB500F......2017 Triumph Street Twin 2014 XT 250........ |
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04-28-2016, 11:17 AM | #85 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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I'm not an expert, I'm only guessing.
If the clearance tightened up to 0.0, the hydrodynamic barrier that occurs with oil would likely be burned off very quickly, after which excessive friction would occur. It seems reasonable that a hardened surface would not survive long under those conditions.
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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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04-28-2016, 12:23 PM | #87 | ||
Join Date: Oct 2015
Location: FL, GA, NC
Posts: 771
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Perhaps I am looking for something that is not there. It is still puzzling to me that there were no symptoms or warning of zero valve clearance. The only clue was the metal tapping, after the damage was done. At least if any other RX3 riders should hear that tapping noise, they will know what they are in for. jb
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2016 Honda CB500F......2017 Triumph Street Twin 2014 XT 250........ |
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04-28-2016, 12:27 PM | #88 |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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This kind of service and support makes me feel all the better about buying the TT250 from CSC. Awesome........ Glad you're back on the rod and I think W&G nailed the explanation.
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"Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350 |
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04-28-2016, 01:44 PM | #89 | ||
Join Date: Jul 2008
Location: Idaho
Posts: 25,054
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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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04-28-2016, 06:32 PM | #90 |
Join Date: Aug 2015
Location: Upstate NY
Posts: 343
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Thanks for posting an update!
I certainly will be checking the valves and adjusting to .008mm for added assurance every 2500 miles. I'm glad CSC helped take care of it! They are doing a good job taking uncertainty out of purchasing a bike from China sight unseen. Maybe if we don't hear "happy tappy" valves it's a good idea to do that adjustment early! |
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