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#1 |
Join Date: Jan 2023
Posts: 3
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Zongshen 125 valve adjustment
Hi, I have a Rieju Tango with a Zongshen 125 engine (it looks like THIS, only muddier), I have no idea what model of engine it is so I've hit a bit of a brick wall in searching for information ... does anyone know what it is, or what the valve gaps should be? Better yet, are there any service manuals available online that would cover this engine?
Any pointers would be gratefully received! |
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#2 |
Join Date: Sep 2021
Location: De Soto, MO
Posts: 1,924
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Nice looking bike. The principles of valve adjustment are going to be the same for all these bikes. There are plenty of YT videos on valve adjustment. But I will go find the info I found for another guy today and put it here.....
Go to post #24 on this page: https://www.chinariders.net/showthre...t=31297&page=2 As far as the gap, about .05mm or .002" should be fine for both intake and exhaust for a 125. You could go to .06mm on the exhaust side if you wanted, since exhaust valves do get hotter and therefore the stems expand more. If you have only inch-marked feeler gauges, make the intake a "tight" .002" and the exhaust a "loose" 002".
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2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself |
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#3 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
If that is the case then the specs for those were Intake: .05 to .09mm Exhaust: .11 to .15mm
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#4 |
Join Date: Sep 2021
Location: De Soto, MO
Posts: 1,924
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If you say so, but .11 - .15mm sounds really loose. Did their exhaust side tend to heat up more than normal? The specs I gave him were for an OHV (CG) Honda motor; .05mm in and ex.
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2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself |
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#5 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Quote:
This is all on the assumption that the engine even is what I said it is. I am going off of one picture that doesn't show much to begin with. I would need more images of different angles of the head to really be able to identify anything. That said, valve specs vary from engine to engine for a reason.
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#6 |
Join Date: Sep 2021
Location: De Soto, MO
Posts: 1,924
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Here is the owner's manual in several languages.
https://drive.google.com/file/d/11eG...sBI/view?pli=1 It gives spark plug type and gap, does not address valve clearances.
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2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself |
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#7 |
Join Date: Feb 2009
Location: Michigan
Posts: 1,040
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Other side.
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2012 Kawasaki Versys 1984 Honda Magna V65 2016 Rhino 250 2016 Tao Tao 125D |
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#8 |
Join Date: Jan 2023
Posts: 3
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Thank you for the helpful suggestions!
With a little image searching I think the engine looks like a modern CG125, like THIS, so I'll go look up how to do the valves on that ... although I have quite a stack of tools I don't have any offset spanners, so I might have to get some of those first! |
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#9 |
Join Date: May 2018
Posts: 1,622
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Have a look low on the engine near the shifter ,there should be a pad with a bunch of numbers letters and girls phone numbers on it ,those numbers will tell you what engine you have instead of guessing .
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#10 |
Join Date: Sep 2021
Location: De Soto, MO
Posts: 1,924
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If it is indeed a CB motor as I thought, then the specs in post #2 do apply.
From Clymer manual M315, which you might want to pick up on Amazon. This is the version I have, which has color wiring diagrams (which may or may not apply to Chinese bikes, IDK). Useful if you have actual Hondas or think you might get one. https://www.amazon.com/Clymer-Public...s%2C122&sr=8-2
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2021 Lifan Xpect--sold 2022 Lifan KPX 1972 Honda CT90--The Carrot 1969 Honda CT90--The Tomahto Cheesy is the WDK (workplace drama king). Now retired. Nope, back in the saddle. Climate: The Movie https://www.youtube.com/watch?v=A24fWmNA6lM How our government really works https://www.youtube.com/watch?v=QjadCd0VRBw Question all authority.....think for yourself |
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#11 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Want to know if it is a CG engine, take the valve cover off. CG is pushrod, the CB and the XT engine mentioned are both OHC.
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#12 |
Join Date: Jan 2023
Posts: 3
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Sorry for the slow response! After reading the above comments I had a moment of clarity ... the engine has a camchain tensioner, so of course it-s OHC, lol
For anyone following in my footsteps, after a little searching I found this guide to be the absolute best (and a huge improvement over anything on Youtube): https://cbf125rider.wordpress.com/20...on-the-cbf125/ Thank you for your help and prompting, this is one of those cases where I just needed a nudge in the right direction ![]() ![]() |
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