1972? K1 CT70 CANDY YELLOW BUILD

Discussion in 'Projects/Builds' started by Eggie, Jul 9, 2018.

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  1. Eggie

    Eggie New Member

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    Hey Guys!

    I'm new to the forum! I just picked up what I believe is a '71 K1 (correct me if I'm wrong) for what I believe was an awesome deal for what it is ($500) Let me know what you think!

    According to the last owner it needs a new ignition switch, battery box and seat.
    But who knows what needs to be done to it to get her up and running smoothly.

    This is the first time I've dealt with these bikes, my last rebuild was on a 1980 Honda CX500 so i know my way around bigger motors, hopefully these aren't too tricky!

    It looks like there you guys have put together plenty of resources to help me get to know these gems a little better.

    I'll keep updating this thread with info/pics/questions throughout my build!

    CT70-1.jpg CT70-2.jpg CT70-3.jpg CT70-4.jpg
     
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  3. racerx

    racerx Administrator
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    Congrats on your new acquisition. It is a K1 model. The date of manufacture (D.O.M.) will be stamped into the VIN tag, located on the steering head tube.

    I wouldn't worry about the AWOL parts, they're far from rare. That bike looks really straight, right down to the handlebars, what I'd call "good bones". It just has lotsa surface rust and pitted chrome...cosmetic stuff, mainly. There are a few idiosyncrasies with these little motors but, nothing that cannot be learned, quickly, if you have some previous mechanical experience. When in doubt, ask questions; you've come to the right place...
     
  4. Tripod

    Tripod Member

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    Looks like a good starting point judging by the fuel cap.
     
  5. Eggie

    Eggie New Member

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    I need to get a new wiring harness, i figured i might as well try to add turn signals as well... is this possible if i buy the 74-
    76 wiring harness?
     
  6. racerx

    racerx Administrator
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    A couple of members reported that the 3-position, K1, keyswitch is plug-and-play with the K3-76 wire harness. That was at least 3 years ago. Worst case, it may be necessary to do a little rewiring, at the modular connector. Regardless of how intimidating a wiring project may appear, at first blush, these electrical systems are really very basic.

    Unless you go with some wildly exotic, aftermarket, system almost anything is possible, without too much difficulty. Primarily, it comes down to sorting one lead at a time and most of them will be plug-and-play, leaving very little to be sorted via process of elimination. Seriously, I've adapted a 4-lead, new-gen (post 2000) 12v/CDI system, complete with new, OEM Honda wire harness, handlebar-mounted switchgear, full LED lighting, electronic control module (self-cancelling turn signals, brake strobe, brake light)...and a full-wave, bridge rectifier/regulator...to work with a 7-lead K1-era keyswitch. It took a couple of days and most of that was "tidying-up"...lengthening/shortening, soldering, insulating, routing leads and mounting stuff...as opposed to figuring out the circuitry. Can't imagine a way you could get anywhere near that level of complexity (which was a LOT simpler & straightforward than you probably think). My guess is that the LH members were right and you can do a K3-76 wiring conversion, plug & play, just as they said.

    Your biggest hurdles will be sourcing all of the parts, if you want to go all-OEM. If you can deal with aftermarket, "universal" signals & switchgear, the most likely hurdle will be getting the mechanical flasher relay to work properly; those things are notoriously temperamental. Electronic flasher relays, in 6v flavor, are vaporware.

    Plan your signal body locations carefully. The OEM K3-`79 signal stalks were way too long and are damage-magnets because of it. I'd recommend clamp-on signal bodies, attached to the handlebars, up front. Out back, a Dax (ST70...the model sold outside of North America) TL bracket has signal mounts on either side of the license plate bracket.
     
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