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Project CBR250 FOUR MC-14

Discussion in 'Your 250cc Projects' started by Murdo, Mar 13, 2018.

  1. Andych

    Andych Well-Known Member Premium Member

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    Or make a B$tchin button as the stuff @Murdo does is pretty B$tchin.


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  2. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

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    Gnarly.jpg
     
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  3. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Rebuilt the seat with some new high density foam and took to get recovered in the original blue colour.
     
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  4. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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  5. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    New radiator arrived yesterday and I cut the mounts off the old rad and glued/riveted to the new one. Some black paint and fitted the fan and shroud, ready to fit.
    xxx 004.jpg xxx 006.jpg
     
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  6. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    The forks arrived from the re chromers while I was away. Keen to get in and do some bike stuff so forks now in, handle bars and levers/switches fitted, wheel in and brakes bled.
    P I trip Oct 2018 063.jpg
     
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  7. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Took the barrels to be rebored. I bought .50mm oversize pistons but am worried the rust may be too deep and will need to go bigger. The machinist is going to do the rusty No1 first and see if it cleans up alright.
    ZXR fairing re paint 009.jpg ZXR fairing re paint 011.jpg
     
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  8. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    My Bike:
    Maico 250, Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, ZZR250 plus a few others.
    The fairings needed some attention with welding of cracks, attaching of button mounts and had to make a corner for one side panel.
    MC-14 painting 006.jpg MC-14 painting 008.jpg
    Biggest problem was one of the main fairing mounts was completely broken with only the brass threaded bushing left. I cut up pieces of ABS from other Honda fairings and soaked in Acetone to make a thick liquid goo. Using a piece of 25mm plastic hose greased on the inside I siliconed that to the fairing, fitted the brass bush and poured in the goo. Will take a few days to set but could not think of a better way to do it.
    MC-14 painting 004.jpg MC-14 painting 014.jpg
    When set I can trim it to look like the other side and paint.
    Most of the paint wasn't too bad but with lots of small scratches and chips. I sanded them down and borrowed an air brush from my daughter and was able to get most of them hidden. A light sand with 1200 grit and a couple of coats of 2k clear and looks pretty 'snazzy'.
    MC-14 painting 001.jpg MC-14 painting 016.jpg
     
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  9. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    With the new Chineseum fuel tap fitted I found the shaft to be about 6mm too long. The original fuel tap handle had split and needed some repair too.
    Street show  Nov 2018 003.jpg
    I plastic welded it back together then drilled with 7.5mm drill 6mm deeper into the recess.
    Street show  Nov 2018 005.jpg
    Then using a 3mm end milling tool in drill press and turning the X and Y axis of the vice I milled out the corners.
    Street show  Nov 2018 008.jpg
    Cleanup with file and sharp knife and fits tops.
     
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  10. minimac

    minimac Active Member Premium Member Contributing Member

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    I'd probably still be pulling it apart!
     
  11. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Where to put the freshly painted panels so they wont get scratched?
    Hang them on the frame.
    Street show  Nov 2018 001.jpg
     
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  12. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    The mounting piece that I made has dried out and I trimmed up with a dremel wheel. Has a bit of porosity on the end but is holding firm and screwed up tight to frame ok after painting.
    glen innes 008.jpg
     
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    Last edited: Nov 28, 2018
  13. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Got my block back from the reboring today. :D The .5mm overbore just cleaned up the rust marks. Party in the laundry tub with hot soapy water. :party:
     
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  14. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    (More Bitchin stuff for the err Bitches?)
    Unable to buy the correct MC-14 (KT7 prefix) pistons I bought MC-22 (KAZ) and needed to remove a small amount from the shoulders of the centre ridge. I made a template from some aluminium sheet filed to fit the original piston as a guide.
    MC-14 pistons 020.jpg MC-14 pistons 018.jpg
    I used an old drill holder bolted to a plate mounted on the carriage of the lathe and a piece of PVC pipe to protect the alloy. Bolted a lathe tool holder to the chuck and spun on medium speed. By slowly moving the carriage forward and across I was able to chip off the required amount. Took a while to set up but was easy to repeat on both sides of each piston.
    MC-14 pistons 014.jpg
    One on right done, left to do.
    MC-14 pistons 016.jpg
    To finish the cut outs I used a sanding drum in a Dremel to smooth the edges. Made a wooden block to hold them too.
    MC-14 pistons 022.jpg
    Installed.
    MC-14 pistons 024.jpg
     
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  15. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Got the head assembled and fitted and was setting the valve clearances (cam on measure, cam off, change shim, cam on, etc) when one of the cam cap dowels dropped neatly down No 4 spark plug hole and landed on top of the piston. :mad: I made several remarks about it being a fornicator and how it's parents weren't married.
    It went down here.
    jokes 003.jpg
    When I calmed down and had a think about it (and after trying many different methods to retrieve it) I thought on a piece of plastic hose with a broken piece of a strong magnet inside it and after a few attempts was able to get the hose through the dowel and hold with the magnet whilst carefully drawing out through plug hole.
    jokes 001.jpg :imtheking:
     
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  16. Andych

    Andych Well-Known Member Premium Member

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    You sir are most definitely THE KING... :bowdown::bowdown::bowdown:
     
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  17. sharky

    sharky Well-Known Member Premium Member

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    Magnets are a very underrated tool, finding nuts, holding cam chains etc.
     
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  18. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Unable to find a centre stand worldwide, I used an old CB250 one that I had put away in my shed.
    Franks engine stand 002.jpg
    Had to slice it down the middle and take out 10mm to make it fit the CBR frame mounts. Bushed the worn end with some 16x1.6mm tube and welded back together.
    Franks engine stand 004.jpg
    Made the mounting bolt from a 1/2"UNC SHCS machined down to suit and threaded 10mm on end. Welded a strap mounting onto right side to sit on exhaust with rubber pad. Sandblasted and a coat of paint and fitted just right.
    stand 001.jpg stand 003.jpg
    Sits the back tyre about 25mm off the ground and folds up out of the way.
     
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  19. Andych

    Andych Well-Known Member Premium Member

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  20. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Looks great Steve
     
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