CB450 K3 Refurb
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Thread: CB450 K3 Refurb

  1. #1
    Senior Member Sonreir's Avatar
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    CB450 K3 Refurb

    So we picked up this CB450 over the weekend. The plan is to refurbish the electrics and get her running properly. The previous owned complained about a possible fueling issue, so we'll take a look at that, too.


    First step is to strip the old electrics and replace them all with new parts.


    The old separate rectifier and regulator have been replaced with a Sparck Moto unit.


    We're also in the process of working on Honda 450 harness recreations, so a sample harness is replacing the old crusty one. Unfortunately, our manufacturer didn't have all of the OEM colors available (yet) and so they substituted white for almost everything! Good thing we know our way around a multimeter.


    Finally, the old coils looked like they were approaching the end of their natural lifespan and so a new set of specially made 4.0Ω coils are going on in place. We're expecting to have these ready for sale late in the summer (or maybe mid-autumn) if they perform well.

    CB450 K3 Refurb-20190609_125709.jpg

    CB450 K3 Refurb-20190609_161415.jpg

    CB450 K3 Refurb-20190609_163238.jpg

    CB450 K3 Refurb-20190609_191755.jpg

  2. #2
    Senior Member Lefty's Avatar
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    Nice one! I'm thinking stock coils are 5 ohm and 4 should give a stronger spark and better performance?

  3. #3
    Senior Member Sonreir's Avatar
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    Yup. That's the goal.

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  5. #4
    Senior Member 76TWIN's Avatar
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    Yeah I saw you posted this on instagram. Nice survivor indeed.
    '76 CB500T Frankenbike
    '73 CL450 (basket case for now)


    Carpe narem.

  6. #5
    Supporting Member 12ozPBR's Avatar
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    Nice find, glad to see it made it into good hands! I like the prospect of your offering of coils, please keep us updated on the availability of those as well as the work on this 450
    Runners
    1971 Triumph Tiger
    1972 CL350
    1974 XL350
    1974 CB450

    Current Project
    1966 CB450 Black Bomber

  7. #6
    Senior Member Sonreir's Avatar
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    Quote Originally Posted by 12ozPBR View Post
    Nice find, glad to see it made it into good hands! I like the prospect of your offering of coils, please keep us updated on the availability of those as well as the work on this 450
    Will do!

  8. #7
    Senior Member Sonreir's Avatar
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    Installed the prototype of our E-Sparck electronic ignition. We're planning to release these for the 350, 360, and 450/500 to start. Hopefully I can get things buttoned up and running so I can put some miles on and verify that all is good.

    CB450 K3 Refurb-64219030_2292509450843949_3641797538731786240_o.jpg
    76TWIN likes this.

  9. #8
    Senior Member ancientdad's Avatar
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    Counting on you to make a quality unit for this situation, Matt... (in light of all the discussion you surely have seen here about others)
    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

  10. #9
    Senior Member 76TWIN's Avatar
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    Quote Originally Posted by Sonreir View Post
    Installed the prototype of our E-Sparck electronic ignition. We're planning to release these for the 350, 360, and 450/500 to start. Hopefully I can get things buttoned up and running so I can put some miles on and verify that all is good.

    Click image for larger version. 

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    I'd like to know more about this EI.
    '76 CB500T Frankenbike
    '73 CL450 (basket case for now)


    Carpe narem.

  11. #10
    Senior Member Sonreir's Avatar
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    Quote Originally Posted by 76TWIN View Post
    I'd like to know more about this EI.
    We've gone with a simple unit to begin with. My preference is to start simple, make sure it works, then increase complexity if it's warranted.

    Cast aluminum is used for the backing plate as well as the cylinder that replaces the points cam. Magnets are embedded into the cylinder and those trigger Hall effect sensors which are epoxy potted in the black plastic casings you see. A little bit of wiggle room exists on the mounts for the sensors so that you can fine-tune each cylinder's timing independently.

    The mechanical advancer is retained for two reasons:
    1.) Primarily, it helps keep the electronic complexity to a minimum, as well as the cost.
    2.) My 360 runs on non-standard timing, which I've accomplished by modifying the advancer I wanted this unit to work on my 360 as well.

    If we end up making our money back on this one, a unit with an electronic advance is foreseeable. Possibly even with tachometer outputs and a programmable curve.
    76TWIN likes this.

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