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Thread: rebuilt my 70 (Hidalgo way)

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    Default rebuilt my 70 (Hidalgo way)

    after my graduation my dad bought me a honda cd70 . it was 2006 model and we got it rebuilt in 2012 but it was araju mochi building the motor n results were bad . loss of money and bike was also f***d.Now yesterday it siezed again i called my dad n said i m building it my way he said go on . so i did few engine mods to it aswell( bad habits are hard to quit )
    so here is the list what i have done n what i will do next
    piston rings honda cd100.(standard)
    complete engine over haul with ahl genuine parts .costs (almost 6.5k)
    new foot rest ,foot bar new exhaust and old model (98) rear lamp. i have got red cf fitted at half fuel tank , still alot more to come
    like new body mods
    rebuilding front suspension
    changing handle bars etc

    legend will revive soon

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    Quote Originally Posted by rashidali4708 View Post
    bahi engin oil main clutch plyte keyoin dip krte hain
    Q k iski engine type wet clutch plates hn oil dipped . Its good if you dip it in oil. Better for performance

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    legend will revive soon

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    Quote Originally Posted by hidalgo View Post
    I m using pridor piston in my 70 . Its engine was rebuilt completely and it rattled again in a month . Kharadya say its mechanic fault and vice versa. Biggest issue is that it heats up . As the oil pump is still of 70 it can't keep up with heat

    Sent from my Nokia_XL using PW Forums mobile app
    That is what my mechanic said as well today, i discussed with him regarding the possibility of using qinchi piston in my united 70. He said it is going to ruin your engine. those Bikes are not meant to be used daily for commuting. If you do that engine is going to give up in a month.

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    Quote Originally Posted by hidalgo View Post
    Q k iski engine type wet clutch plates hn oil dipped . Its good if you dip it in oil. Better for performance

    Sent from my Nokia_XL using PW Forums mobile app

    performance?

    the clutches will burn out if you install them dry.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    performance?

    the clutches will burn out if you install them dry.
    Had to tell that brother in desi language

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    legend will revive soon

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    Quote Originally Posted by IceCold View Post
    That is what my mechanic said as well today, i discussed with him regarding the possibility of using qinchi piston in my united 70. He said it is going to ruin your engine. those Bikes are not meant to be used daily for commuting. If you do that engine is going to give up in a month.
    True .my bike asks for an other gear I mean torque is alot and top is same 85kmph at meter. Now if I swap carb of cg clutch of qingqi with both graris . Primary and secondary than it may go till 100. Funny thing is pridor and 70have same oil pump. I wonder why it doesn't cools. Now bike smells like its burning oil and heats up but there is no smoke . Oil is always less at every oil change

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    Quote Originally Posted by hidalgo View Post
    True .my bike asks for an other gear I mean torque is alot and top is same 85kmph at meter. Now if I swap carb of cg clutch of qingqi with both graris . Primary and secondary than it may go till 100. Funny thing is pridor and 70have same oil pump. I wonder why it doesn't cools. Now bike smells like its burning oil and heats up but there is no smoke . Oil is always less at every oil change

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    Putt another gasket it will be ok after that

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    Quote Originally Posted by saboor73 View Post
    Putt another gasket it will be ok after that
    Head or engine? I also remember there was a time when desi gaskets use to come and they are supposedly thick than OEM. They were used in engines that were old or had some sort of deformity in them. Are you suggesting something similar?

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    Quote Originally Posted by hidalgo View Post
    I m using pridor piston in my 70 . Its engine was rebuilt completely and it rattled again in a month . Kharadya say its mechanic fault and vice versa. Biggest issue is that it heats up . As the oil pump is still of 70 it can't keep up with heat

    Sent from my Nokia_XL using PW Forums mobile app
    It heat's up due to bigger displacement piston in smaller cylinder.
    The first step towards knowledge is to know that WE are IGNORANT

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    Quote Originally Posted by Hassan1991 View Post
    It heat's up due to bigger displacement piston in smaller cylinder.
    Exactly combustion chamber head volume is less in cd70 compared to cd100 more compression means more heat

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    Quote Originally Posted by IceCold View Post
    Head or engine? I also remember there was a time when desi gaskets use to come and they are supposedly thick than OEM. They were used in engines that were old or had some sort of deformity in them. Are you suggesting something similar?
    Every gasket available in market is desi made even one comes in cd70 from factory here in karachi you can even get custom made cooper gasket of any thickness you want thick gasket is usually placed after facing head of engine

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    Saboor do you recommend I keep an other gaskit? Won't it increases the length of cylinder,?and the space inside cylinder I.e where mixture is compressed. It has a word which has slipped out of my mind

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    Quote Originally Posted by Hassan1991 View Post
    It heat's up due to bigger displacement piston in smaller cylinder.
    I know . But the fact the oil oump of 70cc and 100cc are same than it should cool the engine

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    Quote Originally Posted by saboor73 View Post
    Exactly combustion chamber head volume is less in cd70 compared to cd100 more compression means more heat
    So another gasket will increase the volume?

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    Quote Originally Posted by hidalgo View Post
    I know . But the fact the oil oump of 70cc and 100cc are same than it should cool the engine

    Sent from my Nokia_XL using PW Forums mobile app
    But 100 also have bigger cylinder and head which makes a difference.
    The first step towards knowledge is to know that WE are IGNORANT

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    Quote Originally Posted by hidalgo View Post
    So another gasket will increase the volume?

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    It will put compression down

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    Quote Originally Posted by saboor73 View Post
    It will put compression down
    How comes . It ll give more space to compress mixture

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    Quote Originally Posted by Hassan1991 View Post
    But 100 also have bigger cylinder and head which makes a difference.
    Makes sense

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    Quote Originally Posted by hidalgo View Post
    How comes . It ll give more space to compress mixture

    Sent from my Nokia_XL using PW Forums mobile app

    more combustion chamber volume = low compression. e.g. on a 1600cc 4 cyl engine with 10:1 compression ratio the cylinder volume is 400cc, the combustion chamber volume is 40cc - thats how the compression ratio becomes 10:1

    if the volume of the chamber is increased to 45cc on the above engine you will get a compression ratio of 8.8:1



    I would not suggest you do such double gasketing techniques unless you absolutely know for damn sure what you are doing - you will need to measure the effective volume of the cylinder and then the combustion chamber and make note of any squish clearance problems - sloppy squish areas can lead to poor flame propagation and other engine problems like piston ring coking
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    Quote Originally Posted by hidalgo View Post
    Saboor do you recommend I keep an other gaskit? Won't it increases the length of cylinder,?and the space inside cylinder I.e where mixture is compressed. It has a word which has slipped out of my mind

    Sent from my Nokia_XL using PW Forums mobile app
    Don't use double gasket. They leak.
    Double gasket won't increase volume of cylinder. It will only increase the volume of combustion chamber.

    Compression ratio is the volume of mixture displaced by piston divide by the volume of combustion chamber.

    You can use United 100 piston with 78cc bikes and stock head. Two things needs to be cared for. One the piston should be tooled as the bowl of stock 70 head is 48mm wide and the piston of united is 50mm. So cut only ONLY outer 3-4mm of PISTON.NOT center.
    Secondly the valves will touch piston when all heats up. So create a 3mm wide relief that is 1mm to 1.5mm deep end 1-1.5 mm wide in piston center at appropriate place where valves will touch piston.

    This combination gives best compassion ratio.



    Sent from my Nexus 5 using Tapatalk

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    Quote Originally Posted by asjdsm View Post
    Don't use double gasket. They leak.
    Double gasket won't increase volume of cylinder. It will only increase the volume of combustion chamber.

    Compression ratio is the volume of mixture displaced by piston divide by the volume of combustion chamber.

    You can use United 100 piston with 78cc bikes and stock head. Two things needs to be cared for. One the piston should be tooled as the bowl of stock 70 head is 48mm wide and the piston of united is 50mm. So cut only ONLY outer 3-4mm of PISTON.NOT center.
    Secondly the valves will touch piston when all heats up. So create a 3mm wide relief that is 1mm to 1.5mm deep end 1-1.5 mm wide in piston center at appropriate place where valves will touch piston.

    This combination gives best compassion ratio.



    Sent from my Nexus 5 using Tapatalk
    I have to ask what if along the piston we switch head as well. I mean can a united 100cc head fit on a united 78cc engine? Apparently they seem the same as far as fitting go. What do you think?
    If this is possible than no need to cut the piston or worry about valves hitting the piston/

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