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Thread: Chonda CD70 (78cm^3) Cylinder and head swap with Honda CD70

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    Default Chonda CD70 (78cm^3) Cylinder and head swap with Honda CD70

    Is it possible to replace Chines CD70 cylinder and head with Honda CD70. Because honda 70 cylinder displacement is less then most of the chines 70cc bikes.

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    Quote Originally Posted by alizain5 View Post
    Is it possible to replace Chines CD70 cylinder and head with Honda CD70. Because honda 70 cylinder displacement is less then most of the chines 70cc bikes.
    Chinese come on two variants 72cc and 78cc.

    78cc head cylinder cannot be replaced to 72cc ones due to long stroke of 78cc

    Sent from my Nexus 5 using Tapatalk

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    Quote Originally Posted by asjdsm View Post
    Chinese come on two variants 72cc and 78cc.

    78cc head cylinder cannot be replaced to 72cc ones due to long stroke of 78cc

    Sent from my Nexus 5 using Tapatalk
    Believe or not cd70 after 2012 is 78cc as well the cylinder is 72cc but the con rod is of cd100 with piston of shorter height to allow taller conrpd in engine same like yb100 and rx115

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    Left new cd70 piston right old piston
    Chonda CD70 (78cm^3) Cylinder and head swap with Honda CD70 - images?qtbnANd9GcRbI8ziiuFOEFo2k8Q4SuSUYu4i sdQ FSSa6qqFrp7o0fv5fy WaOviXRz

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    That means new cd has high top speed than before?

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    Quote Originally Posted by saboor73 View Post
    Believe or not cd70 after 2012 is 78cc as well the cylinder is 72cc but the con rod is of cd100 with piston of shorter height to allow taller conrpd in engine same like yb100 and rx115
    So it's real capacity could also be 86cc as is the case with chondaz.

    Sent from my Nexus 5 using Tapatalk

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    so in case we change the cylinder to 72 (new) connecting rod should also be replaced?

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    Quote Originally Posted by alizain5 View Post
    so in case we change the cylinder to 72 (new) connecting rod should also be replaced?
    Get piston,cylinder of cd70 and you are good to go

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    No need to change head and connecting rod?

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    Quote Originally Posted by alizain5 View Post
    No need to change head and connecting rod?
    Head is same across all chonda and Honda except hero
    About con rod if chonda is 78cc stock than cd70 piston and cylinder will be bolt on

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    Quote Originally Posted by saboor73 View Post
    Head is same across all chonda and Honda except hero
    About con rod if chpnd is 78cc stock than cd70 piston and cylinder will be bolt on
    Thanks brother, really informative, i will surely try

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    Quote Originally Posted by silver_hawk View Post
    That means new cd has high top speed than before?
    Maybe but who cares about top speed when riding a light weight bike with skinny tyres and shitty brakes

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    Quote Originally Posted by saboor73 View Post
    Maybe but who cares about top speed when riding a light weight bike with skinny tyres and shitty brakes
    there's alot of people brother who cares easily seen on roads.....they drive 70 like RX 115
    i don't blame anyone i'm also one of them

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    Community Votes: 2
    For 78cc cylinder You have to change connecting rod,stud,timing chain and piston ring set.

    Sent from my LINQ X300 using Tapatalk

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    Quote Originally Posted by saboor73 View Post
    Head is same across all chonda and Honda except hero
    About con rod if chonda is 78cc stock than cd70 piston and cylinder will be bolt on
    I do not think Honda will give wrong figure in manual.
    Because they still quote stroke as 41.4mm for cd 70. Chondaz have very long stroke of 49.5mm.

    So installing a chonda cylinder in Honda is impossible unless real stroke of Honda is49. 5mm which is unlikely.


    Head of chonda and Honda is not same at least valves bigger in chondaz. And have different combustion chamber.



    Sent from my Nexus 5 using Tapatalk

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