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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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    Quote Originally Posted by fakhir View Post
    Well heat due to friction, static discharge, hot components, wires and electricity, short circuiting, close compartments, not to mention some visitor coming in with a huge cigar. All of the ustaads working with petrol don't make it to the news headlines that's why we don't know much LOL. Plus I am no expert, i am just a beginner, chances of screwing up are even higher !
    dude! Petrol auto-ignition temperature is arround 250 degreee celcius.....thats 2.5 times the boiling point of water......Im sure friction will not heat up the surface to such high temperatures......... is very much safe to use petrol if there is no naked flame nearby.

    The condition of your bike is very similar to the project bike I bought few months back.....I dismantled the parts and for thorough cleaning, I steamed them in a big sauce pan "DEKCHI" to soften the stains and gunk........then used a nylon brush and diesel to make them shine again........ After you clean brushed metal surfaces thoroughly you can get them polished or SAAN as per liking.
    Bikes don't leak oil, they mark their territory.

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    Wesay there is another easy way to do it but it I wont recommend it. You can use a wire-brush to scrub off the nastiest gunk.......specially the one underneath the engine......I know its a bIItCh to clean and I only used the wire-brush to clean the underneath part as it does scratch the metal surface.....and these scratches wont go away after the polish........so use with caution....thora halka haath rakhna
    Bikes don't leak oil, they mark their territory.

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    Quote Originally Posted by hidalgo View Post
    petrol ya matti ka tail use kero bhai . matti ka tail for cleaning lasts longer then petrol (evaporation concept ) and its local cdi magnet n stuff not good if u want to pump throttel n leave others in smoke , i hope it i ll work and u ill sort it out orignal stuff all the way
    I will second hidalgo...... dont discard it....itni jaldi haar nahi maani hai........Original stuff is way better than the locally made components....... If you dont wanna use a hammer........give it some heat......let the metal expand a little.......it will make a difference........ab thora tow compromise kerna paray ga.
    Bikes don't leak oil, they mark their territory.

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    Quote Originally Posted by hidalgo View Post
    kuch nahi hota yar . keep up good work

    Quote Originally Posted by aximaxim View Post
    Wesay there is another easy way to do it but it I wont recommend it. You can use a wire-brush to scrub off the nastiest gunk.......specially the one underneath the engine......I know its a bIItCh to clean and I only used the wire-brush to clean the underneath part as it does scratch the metal surface.....and these scratches wont go away after the polish........so use with caution....thora halka haath rakhna

    I will try out water + soap at first and then kerosene for tougher stuff.

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    Project+Photography 10/10
    Dream is not that which you see while sleeping it is something that does not let you sleep.

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    Quote Originally Posted by fakhir View Post
    I will try out water + soap at first and then kerosene for tougher stuff.
    Soapy water say buhat mehnat kerni paray geeee........ Use diesel or kerosene........ Remember oil and grease are hydro-carbons and will not dissolve that easily with detergent or soap. You need a hydro-carbon solvent to dissolve and remove them. Therefore use diesel or kerosene as they both will work as a hydro-carbon solvents. They will also help you in removing rust. Using the right cleaning agent will make your job easier.....just like right tools for the job help you........There is a reason you invested in the toolkit.........same reason applies here.

    I would recommend diesel as its heavier and evaporates less than kerosene. All service stations use deisel for cleaning.....it works.
    Bikes don't leak oil, they mark their territory.

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    Loved your project(I'm 1990 yb100 owner thats why) & your Photography is just too much.
    Especially when u zoomed at the Fly.It was awesome.
    I Am the Feel
    I Am The Yamaha!

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    Quote Originally Posted by r1 View Post
    Project+Photography 10/10

    Quote Originally Posted by N0m1 View Post
    Loved your project(I'm 1990 yb100 owner thats why) & your Photography is just too much.
    Especially when u zoomed at the Fly.It was awesome.

    Thanks a lot

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    Quote Originally Posted by aximaxim View Post
    Soapy water say buhat mehnat kerni paray geeee........ Use diesel or kerosene........ Remember oil and grease are hydro-carbons and will not dissolve that easily with detergent or soap. You need a hydro-carbon solvent to dissolve and remove them. Therefore use diesel or kerosene as they both will work as a hydro-carbon solvents. They will also help you in removing rust. Using the right cleaning agent will make your job easier.....just like right tools for the job help you........There is a reason you invested in the toolkit.........same reason applies here.

    I would recommend diesel as its heavier and evaporates less than kerosene. All service stations use deisel for cleaning.....it works.
    Thank you, I will definitely try out your recommendations.

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    Sorry guys, couldn't update this weekend. Will do it ASAP within current week {as soon as I get that damn rusted flywheel off LOL }

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    spray wd 40 or engine oil at jam nuts for the days u nt working on bike
    legend will revive soon

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    Quote Originally Posted by hidalgo View Post
    spray wd 40 or engine oil at jam nuts for the days u nt working on bike
    Sure I can do that for other mechanical components but I am really worried about the electrical stuff underneath the flywheel. Will WD40 damage it?

    But if I would be able to get original 1980 flywheel and the electrical stuff from the market (and at cheap price), then I'll just hammer everything out

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    WD 40 is like LIFE Fuel for any thing on your bike and will not damage any thing have my words, and rest assured yes every spare part of it is availble in new/Old spare part market ....


    you must speed up soldier becuase I am planning big .... (500cc in super running condition for as low as 60 for being a next CafeRacer ? ) and will be hand restored by me InshAllah on weekends..

    Quote Originally Posted by fakhir View Post
    Sure I can do that for other mechanical components but I am really worried about the electrical stuff underneath the flywheel. Will WD40 damage it?

    But if I would be able to get original 1980 flywheel and the electrical stuff from the market (and at cheap price), then I'll just hammer everything out
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    Quote Originally Posted by vickytulla View Post
    WD 40 is like LIFE Fuel for any thing on your bike and will not damage any thing have my words, and rest assured yes every spare part of it is availble in new/Old spare part market ....


    you must speed up soldier becuase I am planning big .... (500cc in super running condition for as low as 60 for being a next CafeRacer ? ) and will be hand restored by me InshAllah on weekends..
    Me Likey likey!
    Bikes don't leak oil, they mark their territory.

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    Quote Originally Posted by vickytulla View Post
    WD 40 is like LIFE Fuel for any thing on your bike and will not damage any thing have my words, and rest assured yes every spare part of it is availble in new/Old spare part market ....

    you must speed up soldier becuase I am planning big .... (500cc in super running condition for as low as 60 for being a next CafeRacer ? ) and will be hand restored by me InshAllah on weekends..
    TOTALLY AWESOME !!!

    Sure, I'll speed it up ....

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    its a wild goose chase ... becuase today I will try to nail it in 50~60k or the deal will be lost lol! let c! because that the maximum I can sped on hobby .. but bike is mouth watering so I am keeping my fingers crossed...

    Quote Originally Posted by aximaxim View Post
    Me Likey likey!
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    Quote Originally Posted by vickytulla View Post
    its a wild goose chase ... becuase today I will try to nail it in 50~60k or the deal will be lost lol! let c! because that the maximum I can sped on hobby .. but bike is mouth watering so I am keeping my fingers crossed...
    50-60k may mouth watering condition 500cc motorcycle.........a little hard to digest........whats that u are hiding under the sleeve sir jee..
    Bikes don't leak oil, they mark their territory.

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    vicky gd luck and cafe fever to u
    legend will revive soon

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    as I said its a wild goose chase!! I started from 15k by the way... will explain all story if succeeded! so far last night I offered 30k... my final magic would be 60k not more! but let see..

    Quote Originally Posted by aximaxim View Post
    50-60k may mouth watering condition 500cc motorcycle.........a little hard to digest........whats that u are hiding under the sleeve sir jee..


    Quote Originally Posted by hidalgo View Post
    vicky gd luck and cafe fever to u
    Hidalgo I dream a dream! this is a wild goose I am chasing :
    Restoring Yamaha 100cc YB100 model1980 -1186037



    OK now stop hijacking Fakirs thread!!! Get back to Topic... :@
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    Quote Originally Posted by vickytulla View Post

    OK now stop hijacking Fakirs thread!!! Get back to Topic... :@
    You helped him alot. He'll be fine.
    Bikes don't leak oil, they mark their territory.

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