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Thread: Queries regarding alteration of 70cc

  1. #1
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    Post Queries regarding alteration of 70cc

    Hello all pakwheelers hope you all guys are fine. I'm a newbie to this forum and this is my first thread.i own a chonda 70cc 2012 model. As the title says i wanna ask you guys that i have searched this forum alot about 70cc and found a post in which all things were described to modify the 70cc engine but sadly i lost the link to that thread .So guys if we change the head the cylinder to 124cc do i have to make any modification in crank shaft or weight etc kindly guide me .I am posting the post which i read once at this forum below.kindly note that i dont want to make my bike ROCKET this alteration is only to decrease vibrations and gain some speed too.i can afford a CG but my parents arent allowing me as we live in karachi and few weeks ago my cousins un reg CG got stolen.Your advice is needed and kindly do give reply and guide me thankyou!


    The post i found here on pakwheels:

    agr bike bht bhaganay ka shauq hai to us kay liyay yay lo

    1)124Head
    2)97cylinder or 124 cylinder
    3)20\65 quesion gherarai
    4)CD-100 weight or 124 weight
    5)16\35 chain spocket
    6)125. carb.
    7)124 ka 1 wala piston
    8)125CDi


    agr us say kum to yay karwa lo.
    1)78 cylinder
    2)Star ka head
    3)SD-110 piston of 1 no.
    4)20\65 quession gherari
    5)15\38 spocket
    6)125 carb.
    7)125 CDI

    agr aur kum to
    1)Cd-100 ka piston
    2)15\38 spocket
    3)125 carb.

    aur kum to srf
    15\38 spocket

  2. #2
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    nice sharing
    Proud Owner of Jialing Jh70 Model 2003

  3. #3
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    dude what about my questions tell me do i have to change weight crank shaft clutch plates etc ?

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    the thread in refrence is by @FC

    is your chonda 72cc or 78cc ?
    @option 1 requires horrendous amount of work/expense/maintiannce.
    requires a lot of kharadia work ..


    @ option 2
    78 cc chonda already have that cylinder (its 86cc in reality) .. head is already star type..
    not sure which sd 110 is refrenced.. if its suzuki then , suzuki piston uses 14mm wrist pin and our chonda uses 13mm so not compatible..
    however hd 110 piston is 52.4 mm flat top 13mm wrist pin and 'can' be installed.. but stock cylinder bore of 72/78 cc bikes is 47mm... the maximum that you can bore it is to 50mm for qingqi piston.. beyond that you would need a new 110cc/107 cc cylinder and their 0 size is 52.4mm..

    quession gerar not sure what it means but if its primary reduction ratio then not sure which bikes gears are these .. mgiht be qingqi



    i also altered my bike .. you can ready my post .. to see what problems i faced.. currently i am on stock bike with only alteration done is pb19 carb... pod air filter... qingqi piston in stock cyliner bored to 50mm..

    i would recomedn a new 110cc engine ... as altertion throws many things out of proportions.. gear ratios... cdi..plug heat range.. compression ratio.. cooling system... improper sized valves (valves meant for 70cc would have to bear the pounding of 110 or 125 cc ) ,, oil pump with insufficiant pressure.. improper bike fuel meterign (carb)..

    use engine can be bought in ok condition @7-11k depending on codition..

    i want to buy a stock 124cc new engine... its not available in pakistan .. we can import it from china but it would cost all in all approx 20k.. but that is a proper engine.. with all parts (carb.cdi ) .. proper sized fuel pump.. import is only possible if minimum qty is 12..












    Quote Originally Posted by rd3php View Post
    Hello all pakwheelers hope you all guys are fine. I'm a newbie to this forum and this is my first thread.i own a chonda 70cc 2012 model. As the title says i wanna ask you guys that i have searched this forum alot about 70cc and found a post in which all things were described to modify the 70cc engine but sadly i lost the link to that thread .So guys if we change the head the cylinder to 124cc do i have to make any modification in crank shaft or weight etc kindly guide me .I am posting the post which i read once at this forum below.kindly note that i dont want to make my bike ROCKET this alteration is only to decrease vibrations and gain some speed too.i can afford a CG but my parents arent allowing me as we live in karachi and few weeks ago my cousins un reg CG got stolen.Your advice is needed and kindly do give reply and guide me thankyou!


    The post i found here on pakwheels:

    agr bike bht bhaganay ka shauq hai to us kay liyay yay lo

    1)124Head
    2)97cylinder or 124 cylinder
    3)20\65 quesion gherarai
    4)CD-100 weight or 124 weight
    5)16\35 chain spocket
    6)125. carb.
    7)124 ka 1 wala piston
    8)125CDi


    agr us say kum to yay karwa lo.
    1)78 cylinder
    2)Star ka head
    3)SD-110 piston of 1 no.
    4)20\65 quession gherari
    5)15\38 spocket
    6)125 carb.
    7)125 CDI

    agr aur kum to
    1)Cd-100 ka piston
    2)15\38 spocket
    3)125 carb.

    aur kum to srf
    15\38 spocket

  5. #5
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    Quote Originally Posted by asjdsm View Post
    the thread
    @asjdsm clear your inbox bro....
    If you ride like there's no tomorrow, there won't be.

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    Well first of all thanks @asjdsm for a long and meaningful reply. My bike's engine is 78cc i am also confused about that quesion gherari and this gear ratio thing is scaring me so i am planing to buy a pit bike's 124cc engine from ranchor line i think it will fit bolt to bolt i hope after this the problem will be solved .

  7. #7
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    Quote Originally Posted by rd3php View Post
    Well first of all thanks @asjdsm for a long and meaningful reply. My bike's engine is 78cc i am also confused about that quesion gherari and this gear ratio thing is scaring me so i am planing to buy a pit bike's 124cc engine from ranchor line i think it will fit bolt to bolt i hope after this the problem will be solved .
    Welcome. Dude ride safe.
    I have heard they are built on fit. Do check the model number of engine first. It is near the gear shift lever..

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    asjdsm bahi itne alter.... karwa le pr jo main cheez hy wo to bata ni ri aur ager wo apki bike main ho jaye to apki bike ki power+speed double ho jaye ge,

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    Quote Originally Posted by imrd.rd View Post
    asjdsm bahi itne alter.... karwa le pr jo main cheez hy wo to bata ni ri aur ager wo apki bike main ho jaye to apki bike ki power+speed double ho jaye ge,
    To bhai app he apna experience share ker kay in ka bhala ker do oos ghareeb ko pata hota to yay saray ALLAH kay maskeen banday aisay khowar na ho rahay hotay

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    hamikhan Bahi mare pas itne information hy kah simple treeqy say bike fast ho jate hy but share is leye ni krta keyion kah koi aur new rider is ko na apply karwy keyion kah choty choty formula say bike main zameen asmaan ka frq ata hy aur bike contorol say bahir v ho jata hy

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    Quote Originally Posted by imrd.rd View Post
    hamikhan Bahi mare pas itne information hy kah simple treeqy say bike fast ho jate hy but share is leye ni krta keyion kah koi aur new rider is ko na apply karwy keyion kah choty choty formula say bike main zameen asmaan ka frq ata hy aur bike contorol say bahir v ho jata hy
    Bhai agar app open forum main kutch nahin batana chahatya To bhai app meharbani ker kay kutch information muj say PM main he share ker lain ho sacta hay k main bhee app kay kutch kaam aa jaoon

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    hamikhan Bahi mare pas itne information hy kah simple treeqy say bike fast ho jate hy but share is leye ni krta keyion kah koi aur new rider is ko na apply karwy keyion kah choty choty formula say bike main zameen asmaan ka frq ata hy aur bike contorol say bahir v ho jata hy

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    bike ki khair ha drive ko control ma hona chaiya..

    Quote Originally Posted by imrd.rd View Post
    hamikhan Bahi mare pas itne information hy kah simple treeqy say bike fast ho jate hy but share is leye ni krta keyion kah koi aur new rider is ko na apply karwy keyion kah choty choty formula say bike main zameen asmaan ka frq ata hy aur bike contorol say bahir v ho jata hy

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    log chty hain bike 120 ki speed say chly par un say bike 60 ki speed main v contorol ni hote,Gamer bike to ban jate hy pr is is ko chlana hr admi k bas ki baat ni hote,
    Main khod Gamer Bike ride krta hoin pr kabi 70 say uper speed ni marta pr jab game ho ya road saaf hoto 120 tak v meter ly kr geya howa hoin main
    log formula ka galt istamal krte hain,is leye main darta hoin kah mare waja say kisi ki jaan na jaye

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    Quote Originally Posted by imrd.rd View Post
    log chty hain bike 120 ki speed say chly par un say bike 60 ki speed main v contorol ni hote,Gamer bike to ban jate hy pr is is ko chlana hr admi k bas ki baat ni hote,
    Main khod Gamer Bike ride krta hoin pr kabi 70 say uper speed ni marta pr jab game ho ya road saaf hoto 120 tak v meter ly kr geya howa hoin main
    log formula ka galt istamal krte hain,is leye main darta hoin kah mare waja say kisi ki jaan na jaye
    Bhai meray app kay pass jo information hay wo to kamaz kam share kero her banda apnay acchay buray ka khud jawab dhay hay app nahin
    app per koi blame banta he nahin hay

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    Quote Originally Posted by imrd.rd View Post
    log chty hain bike 120 ki speed say chly par un say bike 60 ki speed main v contorol ni hote,Gamer bike to ban jate hy pr is is ko chlana hr admi k bas ki baat ni hote,
    Main khod Gamer Bike ride krta hoin pr kabi 70 say uper speed ni marta pr jab game ho ya road saaf hoto 120 tak v meter ly kr geya howa hoin main
    log formula ka galt istamal krte hain,is leye main darta hoin kah mare waja say kisi ki jaan na jaye
    Hakeem sb rahnr da.

  17. #17
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    idr logon ky pas aik 70cc a jaye. To tangain upar utha lety han, control dikhany ky liey, bahi

    Quote Originally Posted by imrd.rd View Post
    log chty hain bike 120 ki speed say chly par un say bike 60 ki speed main v contorol ni hote,Gamer bike to ban jate hy pr is is ko chlana hr admi k bas ki baat ni hote,
    Main khod Gamer Bike ride krta hoin pr kabi 70 say uper speed ni marta pr jab game ho ya road saaf hoto 120 tak v meter ly kr geya howa hoin main
    log formula ka galt istamal krte hain,is leye main darta hoin kah mare waja say kisi ki jaan na jaye
    ------------------------------------ALTERATION/MODIFICATION SEPARATE HUMAN FROM BEAST-----------------------------------------

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    jo log speed up krne k leye frount sprokit 16 ki daal daty hain genion 70 main. wo kouch bhi kr sakty hain control dakhny k leye
    Quote Originally Posted by Fahd150 View Post
    idr logon ky pas aik 70cc a jaye tanjain upar utha lety han control dikhany ky liey bahi

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    yr mery byke main 72cm ka block hy.
    i want to put a bigger piston in it but without cutting the piston from top.

    what i need to buy for that ?

    1- 100 piston
    2- 78cm block
    3- is new push rod required ?
    4- any other things ?
    ------------------------------------ALTERATION/MODIFICATION SEPARATE HUMAN FROM BEAST-----------------------------------------

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