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Project CBR250 FOUR MC-14

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

  1. Murdo

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

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    My Bike:
    1938 Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, plus a few others.
    Been working on the last few bits and now she runs. :party:
    The carbs were the worst for dried up hard crud I have ever seen. I had soaked the jets in 3 bond for over a week and still could not get a wire through them. Ended up carefully drilling them out by hand. Even the needles were stuck in the needle jets.
    MC-14  finished 001.jpg
    Someone had the bright idea to make new gaskets for the fuel bowls (instead of fitting new O rings).
    MC-14  finished 003.jpg
    New needles fitted.
    MC-14  finished 005.jpg
    Set the float height to maximum as the needle tips will seat a little.
    MC-14  finished 007.jpg
    The cleaned, sealed and lubricated carbs ready to fit.
    MC-14  finished 011.jpg MC-14  finished 013.jpg
     
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  2. Murdo

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

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    My Bike:
    1938 Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, plus a few others.
    With the carbs on, new hoses, filter and clips I put some fuel in a tin hanging from the roof and hit the starter. Was very reluctant to fire until I put a teaspoon of fuel down each carb but it ran and soon cleared. Put the vacuum gauges on and got all carbs the same, leaned out the idle mixture until the engine happy and reset the gauges again to get a nice smooth idle. Engine is quiet and got up to temp quickly, fan came on and cooled down, all gears select and clutch good. Fitted all the panels and tank and rolled out of shed.
    MC-14  finished 030.jpg MC-14  finished 031.jpg MC-14  finished 029.jpg MC-14  finished 028.jpg MC-14  finished 032.jpg
    Needs a good clean to get all the finger marks off and will be ready for a test ride. :thumb_ups:
     
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  3. Frankster

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

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    That's a fantastic resto Murdo. Congratulations once again. The bike looks beautiful.
     
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  4. ShaneP

    ShaneP Well-Known Member Premium Member

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    Looks showroom new. Some restorations look better than new, and you know it's been restored, yours looks genuine. Very nice!
     
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  5. Murdo

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

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    My Bike:
    1938 Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, plus a few others.
    Bike is now registered and on the road. Still needs some fine tuning of the carbs (surprise, surprise) but goes well and sits on road good. Even pretty comfortable for an old bloke too. :)
     
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  6. minimac

    minimac Active Member Premium Member Contributing Member

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    Great work on a beautiful machine. Good thing for my bank account that you're too far away from me. I'd be waving crazy, stupid money at you!
     
  7. Murdo

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

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    My Bike:
    1938 Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, plus a few others.
    As I like to run the carbs dry when the bike is not going to be used for a while I was having trouble getting fuel back into the carbs when next wanting to ride. I bought a fuel pump same as the MC-19 uses and went about fitting it. I pressure tested the pump and it will hold a steady 2 psi.
    I made a bracket from 1.6mm mild steel shaped to fit between the frame and battery and used a piece of old conveyor belt rubber which I sanded into a shape to fit the pump and glued to the steel bracket.
    CBR MC-14 002.jpg
    I took a 12v positive wire from the 'on' side of the ignition switch to a relay and 12v power from the battery to the relay to pump. This was so the pump would work when I switched the bike on but not have power to the pump all the time. I put both earth wires (pump and relay) to a frame bolt. Some 8mm hose and a new filter finished the plumbing. I Sikaflexed the relay to the flasher relay as it was rubber mounted and two large zip tie's holding the pump to the rubber on the bracket.
    CBR MC-14 006.jpg
    I turned the key and pump 'ticka ticka ed' for about 20 seconds to fill the fuel bowls, one touch of starter and engine running.
    Found an excuse to go for a ride and all good with no leaks or flooding. The 'bogging' that was there before hadn't changed so after cooling down I put the bike back on the table and lifted the carb tops to drop the needles. Not going to happen as they are fixed height but badly worn. New needles and needle jets on the way.
    CBR MC-14 012.jpg
    This should be the last time I need to look inside these carbs (famous last words?).
     
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    Last edited: Jun 8, 2019
  8. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    Hahaha, there is no such thing as 'the last time' with carbs - it's just a matter of time ;)

    Still take carbs over fuel injection though, once an injector or fuel pump dies it's game over
     
  9. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Mate, it is a Honda not a Yamaha
     
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  10. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I'm surprised you didn't try turning down the top hat on the needle's .5mm on your lathe to drop them.
    Replacing them would be better though especially if the needle jets are worn too.
     
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  11. Murdo

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

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    I would have done just that but the wear in the shaft and jets is too much and would be a waste of time. Will wait for the new bits.
     
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  12. Murdo

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

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    My Bike:
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    With the new jets/needles and a bit more running it has improved considerably. Have been for a few runs with VJMC club and took to local display day in town.
    Blue ribbon street show 2019 010.jpg
     
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  13. Frankster

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

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    I'm assuming this work was done before I rode it on my last visit? It got up and went then, so any improvement on that would be unreal!
     
  14. Murdo

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

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    Yes, new bits fitted before your ride.
     
  15. minimac

    minimac Active Member Premium Member Contributing Member

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    Would you consider trading for a right testicle?
     
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  16. Murdo

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

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    Nah, already got one.
     
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  17. Murdo

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

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    In my efforts to make space in my shed, it has come time for the CBR to move to a new caring owner. I will be taking it to the VJMC national rally in Toowoomba in May and will be putting the 'for sale' sign out. Looking for around $5,000.
     
  18. ShaneP

    ShaneP Well-Known Member Premium Member

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    Hope you get the money. You've documented the work, so that'll help show its value.
     
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  19. risky

    risky risky

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    been sold.
     
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