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Thread: '75 250 mk3

  1. #1
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    Default '75 250 mk3

    Evening all,

    It was me who bought the mk3 250 single Steve Thackery had advertised the last couple of days. This is what I've got



    As steve alluded to I've bought it as a project for a young girl I know who has started an nvq in engineering but has no experience of working on mechanical stuff, the aim is to try and build a useable bike but overall for her to learn the various skills required to work on and refurbish old equipment, and become comfortable working with hand tools.

    I've built a few bikes from bits over the years mainly offroad stuff so this is something new to me with a big learning curve, below I've highlighted with numbers some of the parts laid out, could someone more knowledgeable than me either confirm that I've identified the parts correctly or identify them for me.



    Blue 1 - Headlight with bezel & back plate
    Blue 2 - No Idea
    Blue 3 - No Idea
    Blue 4 - No Idea

    Yellow 1 - Speedo Unit, Tell tale lights, Aprilia Switch Of Some Sort, Fuse Box, Brake Light Switch?
    Yellow 2 - No Idea
    Yellow 3 - Frame end bungs?
    Yellow 4 - No Idea



    Green 1 - Think this is one of the engine covers but it has some sort of drive built into it
    Green 2 - Top race of head bearings?
    Green 3 - No Idea
    Green 4 - No Idea
    Green 5 - top nut for steering yoke
    Green 6 - Engine Mounting bolts, No Idea about thing on the right



    Purple 1 - Headlight Switch, I've the cover in another jar of bits
    Purple 2 - CDI Unit





    I've no idea what condition the engine is in as it's been open to the elements since being removed in the 70's one valve seems to have been removed and is in a jar of bits.

    This is going to be a slow project, I need to finish some building work in the garage before work can start and I also need to source a shot blasting cabinet, I think I'll probably start by setting up a big electrolysis bath and using it to get rid of all the rust to see what condition things are in followed by stripping the engine down.

    Chris

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  3. #2
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    Wow, what an amazing project! Look forward to seeing how this all developes and, of course, the final result!

  4. #3
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    Blue 1 - Headlight with bezel & back plate
    Blue 2 - Headlamp mounts
    Blue 3 - cant expand the pic
    Blue 4 - Front brake plate stays

    Yellow 1 - Speedo Unit, Tell tale lights, Aprilia Switch Of Some Sort, Fuse Box, Brake Light Switch?
    Yellow 2 - Front engine mounts
    Yellow 3 - Frame end bungs?
    Yellow 4 - Pic not clear enough
    Green 1 - Think this is one of the engine covers but it has some sort of drive built into it Rev counter drive which covers the bevel
    Green 2 - Top race of head bearings?
    Green 3 - Points cover
    Green 4 - looks as if they are foot rest rubbers
    Green 5 - top nut for steering yoke
    Green 6 - Engine Mounting bolts, No Idea about thing on the right
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  6. #4
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    Blue 3 - look like collets and spring seats from the rear shocks.
    The previous owner has stripped it into an awful lot of bits. Pity the engine was left partly dismantled as corrosion will have got into the internals.

    Old enough to know better, young enough not to care

  7. #5
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    Quote Originally Posted by Derek View Post
    Blue 3 - look like collets and spring seats from the rear shocks.
    .

    Correct, I can see the wire now that folds out on the bottom adjuster to allow you to set the shock spring harder or softer.
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  8. #6
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    In Green 3 there will also be four cylinder head bolts as I can see they have been removed.
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  9. #7
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    Quote Originally Posted by sam View Post
    Blue 3 - cant expand the pic
    Sam if you hold Ctrl and press the plus Sign on your keyboard you can enlarge the whole page for a better view

  10. #8
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    Chris,
    You can view the Mk3 parts list here. it will be useful in identifying the parts and figuring out how to put the bike back together.

    Old enough to know better, young enough not to care

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  12. #9
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    Old enough to know better, young enough not to care

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  14. #10
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    Parts list and wiring diagram available for download here.
    Be aware that the part list is in 2 sections, you will need to download both to get the complete document.

    Old enough to know better, young enough not to care

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  16. #11
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    Yellow 4 may be the pillar bolts that hold the points cover in place and the rubber grommet looks to be the cover for the brake or clutch adjuster.

    Sam
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  17. #12
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    I really enjoyed your 916 engine conversion thread, looking forward to this one as well! Good luck and keep the posts coming

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