09-23-2016, 08:53 AM | #1 |
Join Date: May 2016
Location: Pittsburgh
Posts: 49
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top end rebuild how often?
hello guys i have a 2006 gy-2 style cg 200 with a zongshen 250 that i converted to a enduro style dirtbike. my question is with pure dirt use how often do i need to rebuild the motor with these chinese motors? I never really go above third gear but i spend alot of time at high rpm's. i was just gonna do the standard 150 hours that id do with a ktm or honda but was not sure if its more or less often since this does hold more oil then a dirt bike
thanks in advanced! |
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09-23-2016, 08:57 AM | #2 | |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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09-23-2016, 08:59 AM | #3 |
Join Date: May 2016
Location: Pittsburgh
Posts: 49
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the the air cooled zongshen 250 and it is a pushrod style
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09-23-2016, 09:08 AM | #4 |
Join Date: May 2016
Location: Pittsburgh
Posts: 49
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heres just a picture of the bike mid ride yesterday still runs great good compression as of now at least just pops alot since i cant find the exhaust gasket for the point that it connects to the motor
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09-23-2016, 09:38 AM | #5 |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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The pushrod engine is one of the longest lived little engines ever built. It was originally designed to operate in absolutely abysmal conditions. A good air cleaner, and thousand mile oil changes will make this engine run a very long time. So will valve clearance check-ups. If you don't have a speedometer, 1000 miles is about 30 hours at an average speed of thirty-five miles per hour. As long as the cylinder compression is good, the engine is good to go. The copper o-ring for the Honda 230 fits, and is much better than the original head pipe gasket that comes with these little hummers.
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09-23-2016, 09:44 AM | #6 | |
Join Date: May 2016
Location: Pittsburgh
Posts: 49
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09-23-2016, 10:03 AM | #7 |
Join Date: Mar 2010
Location: Volcano, Ca
Posts: 7,112
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As ARH states, a dang long time , especially if maintained. It's not like the good-ol'-days where you had to do a bore, piston and rings every two season on your 2 stroke.
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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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09-23-2016, 10:15 AM | #8 | |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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09-23-2016, 10:23 AM | #9 | |
Join Date: May 2016
Location: Pittsburgh
Posts: 49
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09-23-2016, 10:35 AM | #10 |
Join Date: Sep 2014
Posts: 1,913
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CG engines have a centrifugal oil filter under the clutch cover, attached to the crankshaft. It does a good job at trapping the fine particles. Quick and easy to clean once the clutch cover is removed.
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09-23-2016, 11:05 AM | #11 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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The stock screen is identical to what is used in the Honda XR200 OHC motor. It works fine as long as it is cleaned every 10 hours or so.
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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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09-23-2016, 11:34 AM | #12 |
Join Date: Jun 2010
Posts: 380
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Sometimes it's tight, but you can usually get the valve cover off without lowering the engine. Sometimes people will trim or grind away a bit of the valve cover fins to make valve cover removal possible / easier.
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09-23-2016, 12:28 PM | #13 |
Join Date: Jun 2016
Location: akwesasne, NY-13655
Posts: 2,220
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Thank you for that info. I didn't know that. I'll remember it, though.
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09-23-2016, 12:47 PM | #14 |
Join Date: May 2016
Location: Pittsburgh
Posts: 49
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ok thanks for the info ill have to see about grinding it down next time a remove it because ive tried taking it off before while on the bike just didnt have the clearance hopefully doing that will let it slip off
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09-23-2016, 01:37 PM | #15 |
Join Date: Sep 2014
Posts: 1,913
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On some bikes the valve cover will clear the frame if the rocker arms are in a certain position. If it almost comes out, try rotating the crankshaft and see if there is a spot where you can wiggle it out.
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