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Thread: Black cherry

  1. #31
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    Fuel Tank...........
    It started life as a BF one litre tank..
    It was part of the box of Goped rubbish that came with the BF frame and forks I purchased for cheap..
    Beaten to death cannot even start to describe the condition I found it in..
    Deep scars, brown fuel staining inside and out, holes drilled, scuffs and scratches on every part of it..
    Initially I was just going to have a play and see what could be achieved..
    53 hours of work and 3 attempts to produce what I feel is my masterpiece.
    First I used a razor blade to scrap over the surface, this had the effect of removing all the heavy scarring and also the mould seams.
    Then rubbed down with 120 grit Abranet abrasive netting..
    This gave the tank an even finish all over, only problem was the fact that it was now furry..
    I think the tank is made of polypropylene, which tends to break the surface fibres when you use abrasives on it.
    This is where I had to get medieval on it with a "pair of pliers and blow torch" ......
    With the torch wafted over the surface it settled the fibres down..
    Next, two coats of plastic primer (automotive bumper repair aerosol)..
    Then 2 light coats and one heavy coat of BLACK CHERRY MICA paint..
    Handed over to a pro, he lay down 3 coats of 2 pack lacquer..
    it looked incredible until the oven was put on to bake....
    The heat caused millions of microscopic bubbles to appear under the surface....
    We were not sure what caused this effect... my only guess was, that the plastic primer had not had long enough to dry.
    Strip it all off, and start from scratch...
    Second time lucky....... not today.
    This time all went well..... until I noticed there were 8 large bubbles under the lacquer...
    Strip it off.... and start again..
    HOORAH it worked this time...
    So a good layer of lacquer was built up oven baked and then left for a couple of days.
    3000 grit Trizact disc all over then more lacquer.
    3000 grit Trizact disc etc etc etc etc etc.....
    Somewhere along the way I lost count of how many coats of lacquer went on...
    As Rolls Royce once said about the power of there cars " Sufficient "....

    The fuel cap was a ddm alloy item that came on another of my Ebay purchases..
    I lathed the top and sides to thin it down a bit, then made a threaded brass tube to screw in the top..
    Painted to match the tank below it..
    The green Tygon tube is courtesy of the sacrificial BF..
    The green end on the BLACK CHERRY stalk came off Ebay, it was appalling quality..
    So rather than go thru the misery of sending it back, I re engineered it with another threaded brass tube.
    SO there you have the cherry on top......

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    Because the tank had been butchered with a drill, the holes were too big for the Tygon pipe..
    But, because the rear brake caliper would nestle in the pocket at the back of the tank..
    I needed to make the fuel pipe come out sideways...
    A bit of brass and some fabrication, and I came up with a 90 degree angle screw in fuel union..
    A picture will follow for the fuel union... I forgot to take one.
    J.
    There is nothing that cannot be fixed with a good cup of Tea.

  2. #32
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    Wow. That tank looks great. Just curious, what temperature are you using for your paint?

  3. #33
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    Hi there BLT113..
    Thanks for the words..
    Its only the Lacquer that gets baked...
    I believe its 55 centigrade..
    It needs it, otherwise its impossible to get the depth..
    I wanted to be able to swim in the lacquer it was that deep.
    J.
    There is nothing that cannot be fixed with a good cup of Tea.

  4. #34
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    Forgot about the tank mounting bobbins..
    I made these in my lunch break..
    M5 stainless bolts going thru aluminium bobbins.
    The bobbins are a snug fit where they sit in the tank recesses, it takes some of the load off the bolt holes,
    as the weight of the tank bears on the bobbins..
    J.

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

  5. #35
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    Lookin cherry

  6. #36
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    When I was at Le Mans Classic 2014, it soon became apparent that the PMW side stand was useless..
    It would drop down while I was riding, and scrape along the road..
    It also was incapable of keeping the Goped upright on even a slight incline..
    At LMC as with most premier motorsport events, it is bad form to lean anything against anything...
    The last thing you want is to drop your ride on to the side of a priceless and historic car..
    So, once again I decided to re-design rather than remove..
    The GSR25 side stand was missing when I purchased it.......
    Measuring an original PMW side stand on another Goped, it measured up to be 5/16".
    I was in luck... I had a bunch of slightly bent hollow CroMo 5/16" push rods from a race engine that popped..
    Lathed up a bobbin and welded a bump on the end, the bump would act as the detent for the stand.
    Tidied it up with a diamond file and slide the CroMo tube thru..
    Once all my measurements were checked I welded the parts together, leaving a little extra on the foot end.
    The spring was found in my spring box, and was the perfect bore..
    It originally came off a Triumph TR2 handbrake cable..
    I cut a piece off and heated the ends and flattened them down before grinding them flush..
    The mounting is so much easier than the PMW item, that uses a tiny circlip which is impossible to refit..
    All I have to do is tighten a screw up.. and I can add extra washers if I need to tighten the action.
    With the weight of the engine hanging out the side, it will pretty much always fall that way..
    So I have made the length of the stand just right so it keeps the Goped just off horizontal,
    Rather than leaning right over..
    The Aluminium foot was lathed up, and is a press fit on the CroMo tube with a screw for good measure..
    J.

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

  7. #37
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    I must say MrTea, your skills at fabricating and your outside the box thinking to improve on often overlooked items is truly Impressive. I look forward to seeing your BLACK CHERRY with all of her bits and bobs once she is completed.
    CP......
    HOW we ride today, may determine IF we can ride tomorrow

  8. #38
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    I kind of want one of those wheel spacers.. those things are legit
    Quote Originally Posted by traxxas7137
    Or it leaned out so it's smooth power VS gurgle gurgle EXPLODE

  9. #39
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    Quote Originally Posted by SJ View Post
    I must say MrTea, your skills at fabricating and your outside the box thinking to improve on often overlooked items is truly Impressive. I look forward to seeing your BLACK CHERRY with all of her bits and bobs once she is completed.
    Thanks SJ... Looking at some of your creations, it is an honour to receive such high praise from you.
    Although the BLACK CHERRY is not together, most of the bits are finished and ready to fit..
    I didn't want to blow it all in one go and just post up the finished pics..
    Also- I thought if there were a chance that all the info might help someone out,
    Then the drip feed approach was the best way to get the high density info across.
    Photo below is another sneaky peek of future stuff.
    J.

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

  10. #40
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    Quote Originally Posted by SJ View Post
    I must say MrTea, your skills at fabricating and your outside the box thinking to improve on often overlooked items is truly Impressive. I look forward to seeing your BLACK CHERRY with all of her bits and bobs once she is completed.
    No doubt.
    I must admit I am jealous. Just the off the cuff things that you dont even realize... like how you happen to have race motor parts sitting around... or have aircraft engine bolts for your deck.. or most importantly... you chuck stuff up in the LATHE. I would kill for access to a lathe for little things like this!
    I used to have a small lathe and a bridgeport... You dont really miss these things until you have them and lost them... Bridgeport couldnt go when I moved, and I sold the lathe when I moved again...
    My right angle grinder/belt sander parts look like crap in comparison. lol.

  11. #41
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    Here is a link to my introduction.. http://www.billetboard.com/showthrea...meet-you/page2
    It should give you some insight in to what I do.
    I have a Myford Diamond 10 lathe at home..
    At work I have a 50 year old British built Bridgeport.. No power bed or digital readouts here.
    And a Kerry lathe from 1961... Still smooth and accurate.
    There is also enough scrap pushrods around to build a giant sized Kerplunk.... Now there is a project.
    J.
    There is nothing that cannot be fixed with a good cup of Tea.

  12. #42
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    AXLE F.
    Due to the change in width of my two single forks being welded together (narrower)...
    The bothy axle would be to wide.
    So i set to and made a new axle..
    Of course it would of been easy just to tap the original bolt down and cut the end off.. I use a 5/8" tap all the time at work.
    Now, what material shall I use..... Titanium..
    Contacted a company who makes my Titanium wheel nuts...
    He turned me down.... Said he was far too busy to be messing around making me axles.
    The only other material I could see being worth using was aluminium.
    So ordered a meter of 5/8 HE30 bar..
    I made the first axle to fit the bothy forks on my TSi.
    Tapped both ends down just enough to thread the nuts on.
    One end had the nut fitted and then I beat the aluminium on the end, then tidied it up in the lathe so it looks like the other end..
    That nut cannot be removed because of the peening and the thread loc..
    This first prototype has been in use since... It is not bent, nor has it broken...

    The next axle started as a bar of 7/8" HE30 aluminium..
    I machined the bar down to 5/8" leaving a fat bit on the end..
    The fat bit has a hole drilled to allow a 4mm allen key to pass thru, so you can hold the axle while the nut is undone.
    The other end of the axle being threaded for the nut.
    There is a 0.010" thick stainless shim at each end... Don't know why I added the shims, but it seemed the right thing to do.
    This is the axle for the BLACK CHERRY ..
    Photo 1- Aluminium Bothy axle, Photo 2 and on is axle for my forks..
    J.
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    There is nothing that cannot be fixed with a good cup of Tea.

  13. #43
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    AXLE R .
    Although I had no qualms about fitting a aluminium front axle..
    I felt that it would be best to stick with steel at the back.
    Mainly because of the length, and all the other stuff going in it, round it, thru it etc etc..
    Decisions decisions..... Weirdly, I found a 5/8" hollow shaft at work...
    I did a few hardness tests on it.... it was very very hard..
    It also had been centerless ground and was exactly 0.625" (5/8")..
    I welded a ring around one end to build up the metal..
    Once it had cooled I set to on the lathe and shaped the end to match the aluminium front axle.
    The frame had been welded so I could get an exact dimension for the axle length.
    The axle was cut down and the nut end was tapped internally..
    This internal tap was for a thread insert so I could use a 3/8"Unf cap screw.
    Once again the lathe came in to action to make a cup, cap, washer for the 3/8" cap screw..
    There was one Nightmare..............
    The shaft was an exact 5/8" so it was impossible to get thru the frame and wheel cartridge..
    I spent about an hour with it spinning in the lathe running up and down it with 80 grit emery cloth...
    It was way too hard to lathe.... I managed to remove a whole 0.001" in an hour....
    J.
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    There is nothing that cannot be fixed with a good cup of Tea.

  14. #44
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    niz is offline Suck, Squeeze, Bang, Blow
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    Nice work mr tea.
    Quote Originally Posted by Pushinit View Post
    There's a list? Wow that means Arick dodge was first and NIZ was second. Good to know.

  15. #45
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    Engine...........
    Because this was a GSR25 before I sliced it up, it only seems right that I should put the 25cc Zen back on...
    Yeah right.... This engine is an amazing engine for a weed wacker..
    BUT.. For a Goped it is miserable..
    It will not pull from a standing start on a slight incline..
    Down hill and on the flat it will start to get going, but with the 6/82 gearing it is screaming at relatively low speeds.
    I think we should move on from this engine to the next offering..
    J.
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    There is nothing that cannot be fixed with a good cup of Tea.

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