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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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    Nice work once again fakhir! Along with the descriptions...
    The carbon deposit on the head... ah these 2 strokes!

    Going good...

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    Rear break pedal assembly. Closer look at the joint:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710697092 6ddd8000bb b

    Bit zoom:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710697164 79d5e24393 b

    Further zoom. The amount of mud and gunk is surprising:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710697148 05c994409f b

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    Got a bunch of new tools. Forgot to show off earlier:

    Feeler gauge, 0.05 mm to 1mm. Vice grip plier. I don't know what these are called: maybe magnet holder and magnet extractor?

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573989 038e4449f8 b

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    Quote Originally Posted by Automotorsport_Lover View Post
    Nice work once again fakhir! Along with the descriptions...
    The carbon deposit on the head... ah these 2 strokes!

    Going good...
    Thanks . Just wait for the actual piston closeup pics I am attaching right now !!!

  6. #105
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    Finally got the engine separated from the bike frame. Putting the engine on a table to make a comfortable work environment.

    No matter how hard I tried, I was unable to get this annoying little kick assembly off the engine:

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573905 300c99c284 b

    Closeup of the piston area:

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573945 67f1cfed7c b

    Another closeup. This is the space where the carb is placed. The rubber tubings have turned into like metal pipes after fighting the natural elements for 10 long years. I had to cut these using a very sharp knife or cutter:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696918 f16ec1326d b

    Closeup. Check out the deformed screws:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696974 42c7d70360 b

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    Closer look at the oil pump. Check out the deformed screw heads. Thank God I have my trusty impact screw driver along with me.

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696894 cd10bee69b b

    Somewhere on top of the right side engine case. I wonder what kind of screw driver can open this one (except for impact driver)

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696804 f744b14bac b

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    Thank God u r back i thought u r gonna leave this thread for ever
    And aap kon sa wehshi cam use ker rhay o
    Good going bro keep updating
    Can,t think of a better signature

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    Engine on the table.

    Side note: I really love that reflected reddish light. Cool photographic effect for free !!!

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696782 f99ae03f0c b

    Closer view of the rotor wheel. You can see the screws inside the wheel and how deformed they are. All I can witness is mechanic abuse EVERYWHERE !!! My advice: Don't open up your bike yourself if you want to avoid heart attacks...

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696776 a9c18eb015 b

    Gear shaft and drive shaft area:

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573609 2151587dc4 b

    Closing in. Again, deformed screws. Screws don't melt like this in a harsh environment. This is the work of our awesome mechanics:

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573725 f575d766fa b

    Further zoom. Loads of gunk and stuff inside as well:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696670 7573ba7f5f b
    Attached Images Attached Images  

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    restoration se ziada photography thread lagta ha good going!

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    Quote Originally Posted by faizandawood007 View Post
    Thank God u r back i thought u r gonna leave this thread for ever
    And aap kon sa wehshi cam use ker rhay o
    Good going bro keep updating
    Thanks . Well this is just a normal point and shoot camera which I think is 4-5 years old (canon brand). I am using a Rs. 600 camera stand and long exposers. Put the camera in ISO 80 with AV mode and 6-8 (or more) aperture. You need to take care of the lighting as well. And never use flash!

    Finally, as they say: its not the camera... it is always the Photographer

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    Let's view the piston in a little bit detail. We will come back to this in later stages of the restoration:

    Remember the engine on table:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696782 f99ae03f0c b

    Let's do some closeups of the piston area. This is how the piston looks like from close. The amount of carbon is HUGE.

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696538 0ff1722b0c b

    REALLY zoomed in piston. THis pic is not clear (I REALLY need to get a decent camera). You can see the carbon deposits on the top side and the first ring:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696590 4a89ee4d5d b

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    Another angle. Carbon pancake:

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573441 16cca9c14d b

    Really zoomed in. Are these small bar-like marks on the top edge of the piston head normal?

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573561 566053f8f3 b


    3/4 view of the piston. Looks like some mechanic applied loads of gasket cement LOL

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573387 40efa1b10d b

    Bottom lip of the piston. Signs of grinding with the cylinder (I maybe wrong though. Will check it out in detail later on)

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573431 326e92ef78 b

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    Great camera skills. Love your work.
    Bikes don't leak oil, they mark their territory.

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    Analysing the piston from side. Got my finger prints on it as well LOL

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573273 46d0bca230 b

    Zooming in. Area near top of the piston. Looks like the piston was having tough time with the cylinder. Loads of grinding marks. Is this normal? I can't say anything about the piston/cylinder clearance right now as I haven't bought appropriate tools yet.

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696342 f5bae48e44 b

    Some area in the middle:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696422 54fae70d4a b

    Near the bottom of the piston. Vertical scratches are a bit understandable but what on earth are these horizontal brown lines?

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696382 6d1eed34cb b

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    Ok, so we've got some visitors as well:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696116 498467e6be b

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696138 2baa66349d b

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573257 4a312e41d3 b

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573191 df68d516a0 b

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696230 fdcbb09a9a b


    Thank you Mr. Fly but i've got some work to do.... Moving on.....

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    The engine case screws, pretty "screwed" up !!! And the gunk and stuff. I don't know how on earth am I going to clean this engine

    Restoring Yamaha 100cc (YB100, model:1980) - 8710695774 868c71dabf b

    Restoring Yamaha 100cc (YB100, model:1980) - 8709572891 643e45bd96 b

    Restoring Yamaha 100cc (YB100, model:1980) - 8710695882 274bd154fa b

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    Alright, next we should check out the oil pump. I had to cut most of the pipes with a really sharp knife.

    Restoring Yamaha 100cc (YB100, model:1980) - 8709573049 b0453bf315 b

    Zoom:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696098 efa5f3c0a9 b

    Deformed screws once again:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710696058 530183d98c b

    The condition of the screws is horrendous. You MUST buy an impact screw driver !!! Till now my trusty impact screw driver has opened up even the most rusty, soft and screwed up screws as shown below:

    Restoring Yamaha 100cc (YB100, model:1980) - 8709572929 067fa0ddf6 b

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    Okay, the oil pump is off:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710695526 4cbbdf33d8 b

    Another angle:

    Restoring Yamaha 100cc (YB100, model:1980) - 8709572559 97054cbed2 b

    Closeup. The amount of gunk in this engine is legendary. There has to be some sort of world record for this.

    Restoring Yamaha 100cc (YB100, model:1980) - 8709572521 3747447aba b

    Restoring Yamaha 100cc (YB100, model:1980) - 8709572505 f0827feeff b

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    Oil pump closeup. Disassembling it is probably going to be a major challenge:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710695580 95f1cd4816 b

    Restoring Yamaha 100cc (YB100, model:1980) - 8710695640 4ec1be636e b

    Restoring Yamaha 100cc (YB100, model:1980) - 8710695554 f86059f28e b

    Restoring Yamaha 100cc (YB100, model:1980) - 8709572665 67cbfdc425 b

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    Oil pump body closeup:

    Restoring Yamaha 100cc (YB100, model:1980) - 8710695696 b1053ef511 b

    Another pump shot:

    Restoring Yamaha 100cc (YB100, model:1980) - 8709572805 1c24c9a5b1 b

    Closeup. I have no idea what this green stuff is. But as I see there is still some pretty good oil left in there even after 10 years!

    Restoring Yamaha 100cc (YB100, model:1980) - 8710695738 13099d990e b


    Oil pump from another angle. Gunk, rust and fungus. How to clean this up? Would be a total nightmare.

    Restoring Yamaha 100cc (YB100, model:1980) - 8710695350 3295098219 b

    Zooming in a bit:

    Restoring Yamaha 100cc (YB100, model:1980) - 8709572491 fc6dedc757 b

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