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Thread: Some Modifications on Chinese 78cc Bikes for Longer Life

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    Default Some Modifications on Chinese 78cc Bikes for Longer Life

    AOA Everyone.

    You can buy any Chinese bike and spend some amount on it in order to make it more stable and durable. I have a 2013 Super Power SP70. And I have customized/Modified it a bit according to my taste. By Modified, I mean no exterior modification. Only performance improvements that’s it. I am listing below all the tweaks and parts replacement I did in order to customize my Bike. This was done in February 2014.

    1. Tires:
    The stock tire is 4 ply rated and sometimes it is really annoying. Especially for overweight people like me, it gets punctured every now and then. So the 1st step is to replace both tires if possible and at least the Rear Tire with a 6 Ply Rating Tyre. Nowadays, 8 ply tire is also available but that is just in the stock tread design.

    My recommended Brand is Service. I am using Service Vigo 6PR Tire in my bike since Feb 2014 and it is still running great Alhamdulillah and will replace it after a few months with a new one.

    2. Wheel Spokes:
    These also play an important part in giving you a smooth ride. The Stock wheel spokes are sometimes weak enough and bend easily causing damage to the rim.

    I am using CG 125 wheel spokes.
    CD-70 Rear Wheel Spokes will be installed in the front tire.
    CG125 front wheel spokes will be installed in the CD-70 rear wheel

    now, if you are a regular cleaner and clean your bike on daily basis, then go for the Chrome wheel spokes. Otherwise use the simple one if you only go to service station for washing your bike.

    After Replacing tires and spokes, you will feel quite lot difference in the handling and road grip. But this won’t improve any performance.

    Now let’s talk about the stuff you need to replace for better Performance.

    1. Carburettor:
    This is the backbone for your bikes performance. If the mixture is not adjusted properly, you will feel jerks and poor performance. The original carburettor of a 78 cc bike gives a mileage of around 55 to 70 km/Litre for a new bike then gradually moves down with time.

    I have replaced the stock carburettor with a CG-125 Carburettor. With This, The accelerator limit is increased and that clearly means more power and increased top speed. The fuel economy is around 45 km/litre which is fine for me as far as I can afford.

    2. Gear Ratio:
    It is the ratio of the gear and the speed limit. It can be easily modified by changing the Sprockets which drive the rear wheel through Chain.

    The stock sprocket teeth size in 78 cc bikes is
    Front: 14
    Rear: 41

    I have replaced both of them with

    Front: 15
    Rear: 38

    this will modify the gear ratio and you can use a single gear for longer time intervals and at the same time it reduces the vibration in the engine. Gear Ratios of my bike are as follows.

    1st Gear: 25 km/h
    2nd Gear: 50 km/h
    3rd Gear: 85 km/h
    4th Gear: 115 - 120 km/h

    the bikes goes very fast till the 3rd gear and then the 4th one accelerates a bit slower. It is because this gear ratio is for long route riding. And secondly I do not like to race with anyone. I just ride it as fast as I can on main Sharah-e-Faisal and similar roads.

    Now, With Replacing the Carburettor and Chain Sprocket set, I have easily achieved speed of 120 km/h on Long distance Roads in Karachi. And since I ride this fast, I always keep my brakes up to date. No compromise on Braking. Wear safety Helmet all the times while riding.

    I replace the Engine oil every 800 kms so the engine is also pretty much fine Alhamdulillah.

    These are he tweaks I have personally done on my ride and I am very happy. It feels so comfortable better than a new bike I must say.

    Feel free to ask any questions you have.

    I will post my bike pictures tomorrow.
    For Mechanical Works and Car Detailing, Contact 0333-3738698

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    Default

    Did u use these spares used or new one?


    Sent from my iPhone using PW Forums

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    Default

    Quote Originally Posted by mueen.uk View Post
    Did u use these spares used or new one?


    Sent from my iPhone using PW Forums
    All stuff was brand new.
    For Mechanical Works and Car Detailing, Contact 0333-3738698

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    Default

    120 km/hr on stck 78cc engine

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    Quote Originally Posted by mohsinwahhab View Post
    120 km/hr on stck 78cc engine
    Yes. With cg 125 carb. And if you dont believe. Do i care??
    For Mechanical Works and Car Detailing, Contact 0333-3738698

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    i don't care also keep cruising on 120 km/hr
    Quote Originally Posted by civic_90 View Post
    Yes. With cg 125 carb. And if you dont believe. Do i care??

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    Default

    Quote Originally Posted by mohsinwahhab View Post
    i don't care also keep cruising on 120 km/hr
    Thanks alot. I dont do this everytime. Only off peak hours on shara e faisal...
    For Mechanical Works and Car Detailing, Contact 0333-3738698

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    The sprocket you uses decreases the torque of 70 because of which bike is unable to survive in 4th gear
    There's no acceleration in 4th gear
    I experiment this I use 16 & 36 but bike can't survive in bigger gears so I put front stock and now the results are
    1st gear 20
    2nd gear 60
    3rd gear 90
    4th gear 110+ still torque is less than stock
    One more thing my bike having piston size of 1.50 (highest stock size)
    The first step towards knowledge is to know that WE are IGNORANT

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    Quote Originally Posted by Hassan1991 View Post
    The sprocket you uses decreases the torque of 70 because of which bike is unable to survive in 4th gear
    There's no acceleration in 4th gear
    I experiment this I use 16 & 36 but bike can't survive in bigger gears so I put front stock and now the results are
    1st gear 20
    2nd gear 60
    3rd gear 90
    4th gear 110+ still torque is less than stock
    One more thing my bike having piston size of 1.50 (highest stock size)
    I know that. My bike is having all stock internals.
    For Mechanical Works and Car Detailing, Contact 0333-3738698

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    Quote Originally Posted by civic_90 View Post
    I know that. My bike is having all stock internals.
    Then don't suggest these things brother without modifying the engine changing sprocket is useless.
    The first step towards knowledge is to know that WE are IGNORANT

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    Quote Originally Posted by Hassan1991 View Post
    Then don't suggest these things brother without modifying the engine changing sprocket is useless.
    I am not forcing anyone to do this. Its just a thread where i shared my own experience and I am happy with that. If someone wants to do this, that would be their own personal decision.
    For Mechanical Works and Car Detailing, Contact 0333-3738698

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    no problem dear (Y)
    Quote Originally Posted by civic_90 View Post
    Thanks alot. I dont do this everytime. Only off peak hours on shara e faisal...

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    Latest Pictures are here....
    Attached Images Attached Images          
    For Mechanical Works and Car Detailing, Contact 0333-3738698

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    Default

    i recommend you to buy original atlas honda cd70 meter from atlas honda spare parts dealer

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    Quote Originally Posted by amjad635 View Post
    i recommend you to buy original atlas honda cd70 meter from atlas honda spare parts dealer
    Well i think i dont need that bro. Happy with this
    For Mechanical Works and Car Detailing, Contact 0333-3738698

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    Default

    Or check with Ulysses software for Android

    Sent from my Nexus 5 using Tapatalk

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    Quote Originally Posted by civic_90 View Post
    Yes. With cg 125 carb. And if you dont believe. Do i care??
    thori kum kar lo dost

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    Quote Originally Posted by bykelover View Post
    thori kum kar lo dost
    Nahi bhai km nhi krni bro. Gorilla tripod ki jugar kr rha hu so i ll make a video while riding and will post it here. Then doodh ka doodh pani ka pani hojaega.
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    Quote Originally Posted by civic_90 View Post
    Nahi bhai km nhi krni bro. Gorilla tripod ki jugar kr rha hu so i ll make a video while riding and will post it here. Then doodh ka doodh pani ka pani hojaega.
    no offence ...just kidding
    on a serious note ...check this with GPS....Chinese meters are not accurate

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    Quote Originally Posted by civic_90 View Post
    Nahi bhai km nhi krni bro. Gorilla tripod ki jugar kr rha hu so i ll make a video while riding and will post it here. Then doodh ka doodh pani ka pani hojaega.
    Oh bhai koi zarurat nhi ha itne speed ma video bananay ke, logon ke fikar kaam aur apni jaan ke fikar zada karo.

    Edit: didn't read about the tripod.

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