Rediscovered 1971 CT70H

Discussion in 'Honda CT70/Z50 Registry' started by John_J_T, Aug 19, 2020.

  1. Gary

    Gary Well-Known Member

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    Kirb don't think there is an adjustment at the lever- that adjustment is taken care of adjuster you mentioned in the middle of the cable. There is another adjustment under the right side cover under that cover with the 2 screws though.

    green H 1.png
     
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  2. John_J_T

    John_J_T New Member

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    Progress!

    I had twins a month ago so I get about 20 min a night to mess around with the bike. But slowly I'm getting things together.

    So far I've replaced both handle bars, hi/low switch, horn and button, clutch cable, front break cable, front break pads, speedo cable, air filter, battery, throttle assembly and all light bulbs. Things are running great for the most part. Head light works, speedo works, hi/low indicator and speedo illumination lights both work.

    Tail light/break light doesn't work however I am getting around 6.3 volts off the red cable and 6.3 volts off the green cable when pressing the breaks so I know the harness is good. I connected a 6 volt battery directly to the tail light and get nothing so I'm sure the assembly is bad. Ordered a new one tonight.

    The only other thing I can't get working is the darn horn. I know the harness is good because I'm getting 6.3 volts off the red harness cable in the head light bucket. I know the horn works as well because I hooked up red to positive on the battery and green to negative and wow is it a loud horn. Made my ears ring. But when hooked up to the bike pressing the button does nothing. Could have I gotten a bad button? Is there a way to test the horn with it plugged into the harness and bypassing the button? I tried grounding the green cable to the frame but still got nothing. But I know there's power to the horn because I do see 6.3 volts off the harness connection.

    This weekend's project is replacing the muffler, it's cracked right where it comes off the engine so it smokes me out riding it and is loud.

    I also ordered a new rectifier. However I don't really know what is does. Should I replace the original one?

    It is interesting that some of the reproduction parts don't quite fit together right. Had to drill out part of the handle bar to get the clutch cable to fit and I had to file down a piece of the throttle assembly to get the stopper to fit.

    One last question. How the hell do I get the handle bar grips on? They are ridiculously tight and I can only get them on about 1/4 of the way. Then it's almost impossible to get them off after I give up trying to put them on. I read somewhere about hair spray but that seems a bit odd.
     
  3. cjpayne

    cjpayne Well-Known Member

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    Check the rectifier with an ohm meter. It should only let current through one way. It transforms AC to DC to charge the battery. For the grips, I use rubbing alcohol, just keep your hands dry so they dont slip. Check your horn button with a meter. It just simply grounds the power to the bar.
     
  4. John_J_T

    John_J_T New Member

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    Figured out the horn issue is the button. If I take the button apart and short the ring inside to the handle bar the horn goes off. So it's just not making the right connection inside the button. I've ordered another. Right now I'm working on the front wheel. Got new tires and tubes. It took me almost an hour to pry the rims away from the tires. The rubber had damn near fused to the rims because of the rust. I'm polishing them up and will repaint. I will probably replace them at a later date, but they are cleaning up nicely so I'll just roll with them for now.

    Any advice on remove the speedo from the head light bucket? The original bucket is in rough shape so I got a new one. I can get a flat head screw driver under the bottom tab and lift it up but the top tab is too tight to press down and there isn't enough room to pull it out. I tried angling it out from the bottom but there just isn't enough room around it. It looks like it has to be pull out straight but I sure don't see how that's possible. And I don't want to completely break the original bucket to get it out. 20200919_070538.jpg
     
  5. Gary

    Gary Well-Known Member

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    Try pushing down on the face of the speedo with your palm to help compress the gasket between speedo and the housing then as you do that push in on that clip
     
  6. racerx

    racerx Administrator
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    Compressing one of the two spring clips will usually allow the speedo to rock slightly inside the shell. Then the second clip becomes easier to compress. These things can put up a valiant fight, so be patient. Placing a thin strip of sheetmetal between one clip & the bucket can also help.
     
  7. John_J_T

    John_J_T New Member

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    Thanks! I'll give it the old college try.

    Side note...front tire is done.
    20200919_163849.jpg 20200919_163845.jpg
     
  8. John_J_T

    John_J_T New Member

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    Well at this point I think I'm done. Replaced everything that needed it. Rides like a dream.


    Thanks for the input everyone IMG_20201001_114551.jpg
     
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  9. kirrbby

    kirrbby Well-Known Member

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    You did good John_J_T...and you did right by that little motorcycle too :)
     

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