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Thread: Restoring Yamaha 100cc (YB100, model:1980)

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    Smile Restoring Yamaha 100cc (YB100, model:1980)

    Hi everyone,

    I have decided to restore my dad's old YB100. It has been lying around in the garage for 10 years or so. I would also like to mention that I have absolute ZERO experience regarding bikes or engines and not even remotely related to those, this is my first ever project.

    PS: Since I am a bit busy with my own projects, the progress on this is going to be a bit slow (probably only weekends). And this project can even fail due my lack of experience !


    OK enough talk, let's get started:

    Original condition: The bike appears to be in a pretty bad shape:

    Restoring Yamaha 100cc (YB100, model:1980) - 8685650134 9507a2cc25 b


    Special thanks: I would like to thank our respected pakwheels member @
    vickytulla (Waqar) for the much needed initial guidance.


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    get some acetone and ATF, mix both about equal. WD40 is nothing infront of it. It will creep and loosen anything.

    Get a table, put the bike up on it so you can work on it whilst standing, buy an impact driver with bits a large hammer and get to work. Everything will come out, for the chain sprocket removal, wrap a rag on the gearchanger use a vise grip to select a gear, get someone to sit on the seat and load the wheel, take a giant breaker bar and undo the nut.

    are you just doing a customary cosmetic resto or are trying to bring it back to 1980s quality brand new spec?
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by fakhir View Post
    Pressure gauge is pretty easy to operate. Just take spark plug out of the head and insert the pressure gauge into that hole. Now crank the engine 4-5 times until there is no more pressure rise on the gauge. On a bike, around 4-5 kicks will do. But I do know that if pressure is anything less than 100 psi, you need to rebuild the engine (or set valves etc). If a piston has 100 psi pressure then it means that it is on its death bed. CG 125 has 145 to 170 psi according to factory specifications.

    I didn't measure the pressure yet.



    For now I just took the plug out (making sure it is still connected to the generator assembly) and placed it close to the head and cranked the engine (4-5 kicks in this case). No spark at all. This means either spark plug is faulty or the ignition switch is not working or even whole generator assembly needs some serious attention. Since I planned to open up the engine anyways, i didn't bother going into electrical details. But maybe in near future!
    the minimum spec for compression pressure is 150 psi on this engine. if you are at 150 psi, rebuild the top.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    the minimum spec for compression pressure is 150 psi on this engine. if you are at 150 psi, rebuild the top.
    can you please tell a diy for porting a 2stroke cylinder (performance based ) yb100's cylinder to be exect
    legend will revive soon

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    NICE restoring !best of luck I myself own a honda s110 1977 model 2nd owner although it needs cosmetic works but runs like hell and i intend to keep it lifetime and i am also thinking to restore it !

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    awesome project bro Good luck for future, and keep us updated
    Two of the best quotes of Punjabi : 1. Rull tan gae aan! Per Chass aa Gae ai!, 2. Gal Pya Dhol Ty Wajana Penda ay.

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    Quote Originally Posted by hidalgo View Post
    can you please tell a diy for porting a 2stroke cylinder (performance based ) yb100's cylinder to be exect
    For starters you would be super just by cleaning up the ports, make sure the transfer ports are smooth transition sideways into the bore. For more advanced porting you then need to change carburation, intake timing and also exhaust expansion chamber. I wont recommend you do all that.

    I built a KH125 (GTO125) once which was insanely quick, so quick that by the time you would be changing 2/3 gear - the bike would have changed from 4/5 gear. I lost my freind to that bike. Then I left all this in small motorcycles, they are not built for it.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by hidalgo View Post
    bro dnt waste a lot of money in modern boring etc etc , just a sugession .
    Sure, I am already on an extremely tight budget . (But the thought of kharadias using a vernier alone for boring is making me nervous)

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    Quote Originally Posted by Xulfiqar View Post
    get some acetone and ATF, mix both about equal. WD40 is nothing infront of it. It will creep and loosen anything.

    Get a table, put the bike up on it so you can work on it whilst standing, buy an impact driver with bits a large hammer and get to work. Everything will come out, for the chain sprocket removal, wrap a rag on the gearchanger use a vise grip to select a gear, get someone to sit on the seat and load the wheel, take a giant breaker bar and undo the nut.

    are you just doing a customary cosmetic resto or are trying to bring it back to 1980s quality brand new spec?
    What is acetone and ATF? Where can I get these?

    I've already got impact driver, good tool. By Vice grip you mean vice grip "plier" right ? I'll try it. Right now I need to open that rusty exhaust sleeve nut so that I can get the whole engine off the frame.

    I am trying to restore the bike to its original 1980 look.

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    Quote Originally Posted by Xulfiqar View Post
    the minimum spec for compression pressure is 150 psi on this engine. if you are at 150 psi, rebuild the top.
    Really? What is the healthy compression range for this engine? Can you give reference? (for some odd reasons the compression values are not mentioned in the Haynes YB100 workshop manual)

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    Interesting thread!
    Good luck! Its going to be a hell lot of work and us going to take a lot of time! Till then we all would have something to enjoy on PWs

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    what are the updates fakhir?
    for removing magnet pls buy magnet puller and holder , do n t do it by hammering please . and will u convert it to cdi or keep it as point?
    here is a pic of my new modification
    Attached Images Attached Images   
    legend will revive soon

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    Quote Originally Posted by hidalgo View Post
    what are the updates fakhir?
    for removing magnet pls buy magnet puller and holder , do n t do it by hammering please . and will u convert it to cdi or keep it as point?
    here is a pic of my new modification
    I don't have much experience but isn't this air filter a bit smaller? i.e: is it able to pump enough air volume into the engine? How's performance? pick and top speed etc?

    I've already bought a magnet puller and universal holder. I will keep its original point system. If I succeed in putting the engine back then I will show that it is very easy to set the point using a dial gauge (2-3 minute job at max).

    Sorry was pretty busy this week, but will try to pick up some pace now inshallah. You guys can put pressure to make the progress even faster

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    this filter is enuff for this bike infect it pumps more air bike breaths better burns fuel more runs more
    legend will revive soon

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    dn t hustel in dis assembling and yes if u got a store room large enuff , place a table and place bike at it on double stand and work around it . i did this practice with my 88 .
    legend will revive soon

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    aslam-o-alaikum hidalgo

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    helo hidalgo

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    i am new on this thread

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    Good Luck
    Faster, faster, faster, until the thrill of speed overcomes the fear of death.

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    kharadias do not use vernier caliper for cylinder bore. they ask the customer to bring the piston and according to that piston they bore the cylinder. after they bored cylinder they put piston into cylinder they polish it and after polishing they recheck. if the piston is so tight they polish it again to get accurate clearance. our kharadias have no facilities to do work according to the Japanese workshop manual.

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    fahir is restoring yb100 1980 model. but the genuine spare parts are not available now. even yb100 latest model's genuine parts are very rare now. if any shopkeeper have, they charge more according to his will.

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