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treeno |
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treeno Crazy Courier
Joined: 26 Dec 2012 Karma :
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Posted: 15:19 - 19 Jul 2013 Post subject: CG125 cylinder + piston woes |
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Hey!
Long story short I replaced the piston and barrel on my 1997 CG125 and the new piston is more domed than the old one and is also taller. This results in the piston poking out of the end of the barrel by ~1mm. I have a feeling this means that someone in the past has replaced the piston and cylinder head with one from the newer models which according to what I've read (link below) had flatter and slightly shorter pistons and a non-recessed cylinder head.
https://hondacg125.awardspace.com/how_to_increase_engine_size.htm
Anyway, can anyone confirm that the older models had a recessed cylinder head which would allow for the piston poking out of the barrel and stop it from bumping into the head as it does currently?
Ta! |
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unitynotsocri... |
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unitynotsocri... Banned
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Posted: 21:08 - 19 Jul 2013 Post subject: |
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difficult one ....Measure the size of the pistons , check the barrel , and compare with spec . You may have an odd chinese barrel or piston , check the ohc models to compare . ____________________ nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS |
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treeno |
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treeno Crazy Courier
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treeno Crazy Courier
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unitynotsocri... |
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unitynotsocri... Banned
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Posted: 23:30 - 21 Jul 2013 Post subject: |
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The different gudegeon pin sizes . You may have a later model piston .
One way to check its ok is to put a thin layer of grease or bluetack on the piston , put the barrel , piston and head on and tighten the head bolts.....
then turn it over through a few good turns .Disassemble the head and check the valves are'nt touching the piston crown by marks in the bluetack / grease / paint. You may end up with a higher compression cg , they are tuned lowish anyway .
differences in the skirt should be checked , and rings / oilway patterns / casting marks to indentify it visually / by measurement on ebay parts etc . ____________________ nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS |
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treeno Crazy Courier
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treeno Crazy Courier
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unitynotsocri... |
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unitynotsocri... Banned
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Posted: 12:07 - 22 Jul 2013 Post subject: |
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I reckon the flat piston is wrong ,or a really early jap one . The domed one looks right . Dry fit them ,use old gasket on head to check . ____________________ nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS |
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treeno Crazy Courier
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unitynotsocri... |
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unitynotsocri... Banned
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Posted: 14:48 - 19 Oct 2013 Post subject: |
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If the skirt is not too long or short and the small end fits ok .
Check for oilway paths from conrod and behind rings are up to it .
Most of all Accuratley........measure the piston bore clearance. ____________________ nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS |
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Old Thread Alert!
The last post was made 10 years, 230 days ago. Instead of replying here, would creating a new thread be more useful? |
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