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Thread: CG125 Engine (Anatomy)

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    Cool CG125 Engine (Anatomy)




    CG125 Anatomy
    This video shows how a Pushrod single cylinder (CG 125) works with a dissected engine showing moving parts. Behind this OHV you can find an OHC single too.


    i have a question for you, there is a mistake in the setup can you point out what it is ?
    If you ride like there's no tomorrow, there won't be.

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    nice,

    mistake as is in missing the oilers for the upper rockers and also the camwheel?
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Red face

    Quote Originally Posted by Xulfiqar View Post
    nice,

    mistake as is in missing the oilers for the upper rockers and also the camwheel?
    I think i see a cam gear beneath the cam followers but anyhow there might be other things missing as well, the mistake is in the main basic process of combustion that is taking place.
    If you ride like there's no tomorrow, there won't be.

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    Quote Originally Posted by Chaudhary007 View Post
    I think i see a cam gear beneath the cam followers but anyhow there might be other things missing as well, the mistake is in the main basic process of combustion that is taking place.

    whats wrong with it?
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    whats wrong with it?
    Spark denoted by a light is taking it place at every cycle (every time the piston comes up). It supposed to happen after alternate cycle in a typical 4 stroke engine....... In exhaust stroke there is not spark.

    At the moment it's depicting a sort of 2 stroke engine in which the spark takes place in every cycle.

    The sole reason why a kawasaki gto would smoke cg every day of the week
    If you ride like there's no tomorrow, there won't be.

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    Quote Originally Posted by Chaudhary007 View Post
    Spark denoted by a light is taking it place at every cycle (every time the piston comes up). It supposed to happen after alternate cycle in a typical 4 stroke engine....... In exhaust stroke there is not spark.

    At the moment it's depicting a sort of 2 stroke engine in which the spark takes place in every cycle.

    The sole reason why a kawasaki gto would smoke cg every day of the week
    Lol its not a mistake cd70 cg125 cd200 all have waste spark ignition system and its Normal for spark to occur on exhaust Stroke

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    Quote Originally Posted by Chaudhary007 View Post
    Spark denoted by a light is taking it place at every cycle (every time the piston comes up). It supposed to happen after alternate cycle in a typical 4 stroke engine....... In exhaust stroke there is not spark.

    At the moment it's depicting a sort of 2 stroke engine in which the spark takes place in every cycle.

    The sole reason why a kawasaki gto would smoke cg every day of the week
    Quote Originally Posted by saboor73 View Post
    Lol its not a mistake cd70 cg125 cd200 all have waste spark ignition system and its Normal for spark to occur on exhaust Stoke
    as mentioned by saboor

    honda CG125E has wasted spark ignition - the plug will fire everytime the cylinder reaches TDC no matter if on the compression stroke or exhaust stroke.

    infact - any single cylinder motorcycle with its pulser, points on the crank or magneto will be wasted spark - even CD200 twin is like that - it wastes a spark on each cylinder.

    Honda CB125, CB185 etc engines are not wasted spark - their triggers are fired from the cam.


    btw - two stroke are not just only fires on every stroke, - in a 2 stroke every upstroke is compression and it results in a power stroke.

    the exhaust happens as it descends and opens the exhaust port, at the same time the transfer ports open to transfer new mixture from the crankcase to the cylinder.

    everytime the piston rises a negative suction is created in the crankcase of a 2 stroke and the intake stroke takes place.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    as mentioned by saboor

    honda CG125E has wasted spark ignition - the plug will fire everytime the cylinder reaches TDC no matter if on the compression stroke or exhaust stroke.

    infact - any single cylinder motorcycle with its pulser, points on the crank or magneto will be wasted spark - even CD200 twin is like that - it wastes a spark on each cylinder.

    Honda CB125, CB185 etc engines are not wasted spark - their triggers are fired from the cam.

    like old c90

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    Quote Originally Posted by saboor73 View Post
    [/b] like old c90
    yes - that too had it from the cam.

    it runs half crank speed - so it can fire every power stroke.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    @Xulfiqar

    My bad....i didn't knew

    Can you please tell me about the large vacuum which is created in the intake manifold and carb upon release of throttle ?

    And how a bit open exhaust can result in popping during decel ? Can a small difference in dia from the stock muffler can cause this condition ?
    If you ride like there's no tomorrow, there won't be.

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    Quote Originally Posted by Chaudhary007 View Post
    @Xulfiqar

    My bad....i didn't knew

    Can you please tell me about the large vacuum which is created in the intake manifold and carb upon release of throttle ?

    And how a bit open exhaust can result in popping during decel ? Can a small difference in dia from the stock muffler can cause this condition ?
    Yes it can.

    At bit he exhaust and inlet(to match inlet manifold with inlet port after I swapped a pz carburettor on chonda 70 head ) .
    I had experienced it. They cause turbulence at unwanted place and at unwanted time.

    All ports should be aerodynamically in flush contact for best smooth ride.

    Sent from my Nexus 5 using Tapatalk

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