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  1. #1
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    BLACK CHERRY GSR50 GEO - 2017 BUILD OFF - MrTea

    It All Starts Here

    A few photos of a little trinket I knocked up.
    ... J.

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    There is nothing that cannot be fixed with a good cup of Tea.

  2. #2
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    Front Axle

    Hollow 5/8" CroMo tube.
    Fixed at either end, with 3/8" UNF V rated flanged flywheel bolts.

    The ends of the axle were heated to cherry red, then allowed to cool slowly in the oven.
    This softens the material.
    This then allows the threads to be easily cut.
    It is then re-heated and quenched, to re-harden it.
    ... J.

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    There is nothing that cannot be fixed with a good cup of Tea.

  3. #3
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    The little square trinket...

    On this build i'm going to run my first set of hydraulic brakes.

    BUT, with a single brake lever..

    The Aluminium block is a 3 way union.
    Using Hope M6 to 5mm adaptors.

    Because the discs and calipers are usually used on Mountain bikes with large wheels,
    the mechanical advantage on a Goped wheel is massive..
    So. hopefully.... Running 2 calipers from 1 lever should work...

    The differential front to rear bias, is covered by the discs being different sizes..
    160mm front, 140mm rear..

    On Black Cherry Le Mans..
    I ran a single mechanical lever to both calipers...
    It worked very well..

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    There is nothing that cannot be fixed with a good cup of Tea.

  4. The Following User Says Thank You to MrTea For This Useful Post:

    CaliusOptimus (01-21-2017)

  5. #4
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    On this build... As the title says..
    I am using the Zenoah GZ50N engine, taken from a BCZ5000 Strato Charged Strimmer.

    50cc , 45.5mm bore, 31mm stroke.

    Zenoah do not release the power figures for these engines...
    But, as they run very lean in the original application...
    Adding more fuel releases a mass of power.

    As we found earlier this year..
    On the 25cc Geo engine, all the is required to make the engines sing.... More fuel.
    Luckily... The carb has removable restrictors on the high and low needles.

    The photos and video show its original look when affixed to a strimmer.

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    There is nothing that cannot be fixed with a good cup of Tea.

  6. #5
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    Yes! I've been thinking about running two hydro calipers into one lever for a while now. Let us know how it works out!

  7. #6
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    Quote Originally Posted by MrTea View Post
    The little square trinket...

    On this build i'm going to run my first set of hydraulic brakes.

    BUT, with a single brake lever..

    The Aluminium block is a 3 way union.
    Ignorant question, but hasn't t this been done yet for offload quads or maybe racing trikes too small for a central brake cylinder system ?

    If not done yet on commercial applications the challenge will likely be with the different brake "wire" lengths since brake pressure would be lower on the longer line. changing visosity of the oil in the control line and the longer side of line after the adapter would likely require a chemical barrier in between its oil and the other oil to allow glide ( a mechanical part would have friction issues) smoothly with the brake pressure increase - not sure which gas or liquid could serve as valve and how to stabilize that.

    Some loss of precision and braking power of the last bit till lockup ( 2x single channel ABS system would work but is overkill) on the longer brake lines end is to be expected, if this is the rear and you want to keep front well away from locking the loss of ability to tail-fling or simply to apply rear brakes in main in situations such as on gravel would be sacrificed.

    May work for a showboat on a clean track, tho

  8. #7
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    As Mr tea is in car mechanics he will probably be able to tell why there is a functional difference in how a cars central brakes cylinder distributes hydraulic pressure precisely adjustable to 4 wheel with different hydraulic line lengths to each of the callipers from that cylinder.

    Is it a pressure reduction or levelling system on each line or at the calliper, is it the braided steel lines, is it higher hydraulic pressure and a spread in adjustment range ?

  9. #8
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    The 50cc Strato charged engine was robbed from a complete strimmer.

    And replaced with a 45cc version...
    Because I needed all the external parts, like engine cover, air filter cover etc...
    I will have to make replacements...

    Photos show engine stripped of the very large red plastic engine cover..
    And missing the air filter cover.

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    There is nothing that cannot be fixed with a good cup of Tea.

  10. #9
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    With the engine cover missing....

    There is no control of the fan forced cooling air..

    About 3 years ago when I first got hold of the 45cc version, I started to make a cowl to direct the air over the cylinder.
    I lost interest... Mainly due to other issues trying to mount the engine.

    After having my interest re-ignited, from the acquisition of the 50cc version....
    The cowling was re-visited..
    It started life as a flat plate of 2mm thick aluminium.
    After cutting, bending, bashing... It sorted of fitted..
    But looked rubbish...

    Photo shows the cowl fitted..

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    There is nothing that cannot be fixed with a good cup of Tea.

  11. #10
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    After welding up the seams on the cowl....

    The work started on making it look pretty..
    The welds were filed back, and using coarse grades of emery on a rubbing block, it started to look a bit more professional.

    Using Abranet abrasive sheets... And running up through the grades...
    It came together nicely..
    With a final polish... Perfect.

    OR, it was perfect until I polished the fan cover..
    And realised that although the cowl was shiny, the surface was really wobbly..

    Decided to have another bash at flatting the surface...
    Using a hard flat rubbing block... I managed to flat out all the peaks and make a half decent job of it.

    Photos show Hand made cowl, refinished.. And original fan cover polished.

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    There is nothing that cannot be fixed with a good cup of Tea.

  12. #11
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    looks great! nice job on the seams and polishing!

  13. #12
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    That project removed some serious time from your life, and well worth it.

    Looks magnificent J.
    Hell Fab

  14. #13
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    Quote Originally Posted by Depths of Hell View Post
    That project removed some serious time from your life, and well worth it.

    Looks magnificent J.
    Only took a day or two..........
    ... J.
    There is nothing that cannot be fixed with a good cup of Tea.

  15. #14
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    Mother Marry of Cheese and Fries that 'cowl' is simply gorgous. A work of art like the curves of a Womans thigh Perfection.
    CP......
    HOW we ride today, may determine IF we can ride tomorrow

  16. The Following User Says Thank You to SJ For This Useful Post:

    MrTea (01-23-2017)

  17. #15
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    The engine is missing an important part...

    The air filter housing.
    The original part is made of black plastic, and forms part of the smooth shape of the original strimmer engine casing..

    I tried in vain to get hold of one....
    3 dealers told me it was a discontinued part....
    Even though I gave them the latest part number for the 2016 model....
    I guess it was way to hard for them....

    In true MrTea fashion....
    I made one......

    Started out as a block of HE30 aluminium...
    4 hours on the milling machine.....
    Its not finished yet.....

    Photos show the Air filter housing rear, which is also the butterflies for the Strato Charged air system..
    And the unfinished air filter housing cover.

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    There is nothing that cannot be fixed with a good cup of Tea.

  18. The Following 2 Users Say Thank You to MrTea For This Useful Post:

    CaliusOptimus (01-23-2017),Depths of Hell (01-24-2017)

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