My little Honda

Discussion in 'Transportation' started by LazyPK, Nov 7, 2018.

  1. LazyPK

    LazyPK Supporter Supporter

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    Came home with this last night.

    1980 Honda CB125s

    Needs a new tank (someone dropped it), and there is an issue with the wiring I think (turn signals don't blink) but it's a blast to ride. Only has 1100 miles on it. I think it'll be great around town and in the woods. I'll post some better pictures when I get home
    20181106_181134.jpg
     
  2. NevadaBlue

    NevadaBlue Graybeard Supporter Bushcraft Friend Bushclass I

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    Way to go!
     
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  3. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    That'd be a fun bike to mod! Hopefully it's just the flasher, not that it'll be to hard to figure out. Cb's weren't typically off roaders..whatcha got planned? Dirt tracker?
     
  4. gohammergo

    gohammergo I like sharp things.... Supporter

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    No helmet? No chaps? No leathers? You need to get outfitted! :)

    That's a fun bike you have there. Set it up for dual sport and the world is your oyster. :)
     
  5. Beach Hiker

    Beach Hiker Traveller Supporter Bushcraft Friend

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    Love it!
     
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  6. 66drifter

    66drifter Guide

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    those little machines were what legends were made of

    specially Honda's

    the CB as i rememberize had a low charming plated pipe that ran straight back under the foot pegs

    the SL's simply didn't have the charming plated pipes and just behind the foot pegs they turned up and exhausted somewhere about even w/ the axle

    the SCRAMBLERS had a charming plated high pipe that looked like a P-TRAP under a sink up front and then turned straight back exhausting about the level of the top of the rear tire

    that little one lung engine was a staple for Honda for several years and was even made in larger sizes for the American market( 175, 250, 350, 500 & later on a 650)

    the ignition on those machines have a GREEN WIRE that is the heart's blood learn it's work/job and how to keep it protected

    the points cover needs to be greased where the gasket touches both surfaces any time it is removed or the engine can drown due to moisture fouling the points

    the intake manafold boot & breather also need greasing at all joints to prevent water intrusion and hydraulic lock

    knowing understanding and caring for these issues will make your rides much more enjoyable and insure your timely returns...

    get a larger plastic fuel tank eliminate the turn signals and get a more streamlined tail light

    the larger tank will allow you to play longer

    the turn signals WILL get knocked off/destroyed in the woods

    same for the tail light if left stock

    plastic fenders are made for them... get/mount a set

    what you have is the foundation for a very rewarding/capable beginner's ADV bike

    as mentioned above helmet boots eye protection gloves knee & elbow protection

    i campaigned my SL for 2 years on the Texas Enduro Circuit back in the day and it never failed to get me home ;-)
     
  7. wingnuts

    wingnuts Hunter/Gatherer Provider/Protector Supporter

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    You lucky dog!
     
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  8. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    Dang this thread! I have a honda xr500, suzuki 185, and a goldwing to work on...now I. Getting the itch lol....
     
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  9. x39

    x39 Hyperborean Supporter

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    @LazyPK , if you keep the oil fresh in that it will probably outlast all of us.
     
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  10. LazyPK

    LazyPK Supporter Supporter

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    Good to hear @x39.
    @66drifter do you know what manuals I need to work on this?
     
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  11. LazyPK

    LazyPK Supporter Supporter

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    Also discovered that the turn signals don't flash at idle but do in gear. I think that's how they are stock?
     
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  12. Crusher0032

    Crusher0032 Appalachian Arthfael

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    Hard to tell from the pic, but a lot of times you can push air into the tank through the fuel outlet on the bottom with an air compressor and then tap around the edges of the dent with a small hammer. It takes a few minutes but most of the dents pop right out with slight damage around the edges. Fiberglass or bondo over those rough edges, sand it and spray paint it and it looks good as new. Ive fixed many of them this way.

    One of the biggest problems you often run into with those old bikes is rust in the gas tank. At the very least, put a inline filter between the tank and carbs.

    Those old Hondas are a blast to work on and ride, even the little ones. Have fun!
     
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  13. LazyPK

    LazyPK Supporter Supporter

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    There's no rust in the tank, it's only a a couple years old. It's got a pretty big dent on one side
     
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  14. LazyPK

    LazyPK Supporter Supporter

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    Haven't checked the petcock for rust yet though
     
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  15. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    Hit up Google for Honda cb125 owners manual and service manual. There's prob a honda cb owners forum also. Some forums have some cool modded ones.
     
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  16. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    I always add a inline filter right after the petcock...
     
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  17. x39

    x39 Hyperborean Supporter

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    Easy does it on the air though. A buddy of mine did this with the tank on his Sportster and it wound up looking like a football. He didn't think it was quite as funny as I did...
     
  18. Crusher0032

    Crusher0032 Appalachian Arthfael

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    :4:
    Go go gadget flame suit!

    That's what happens when your bike is made by a bowling pin and bicycle company :54::D
     
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  19. 66drifter

    66drifter Guide

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    @66drifter do you know what manuals I need to work on this?[/QUOTE]

    all we had back then were CLYMER manuals
     
    Last edited: Nov 10, 2018 at 11:07 AM
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  20. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    I've heard of popping seams pretty easily, I've been nervous to try air. Check out" pops a dent" or something like that...I did a ghetto version with hot glue and a plastic tea bottle to pull out a big portion of a gnarly dent on my gold wing tank. still needs body work...it was creased.
     
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  21. LazyPK

    LazyPK Supporter Supporter

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    Okay, so it was running great the other day, but now it wont start. I am not getting a spark. I will put a new plug in and see if that helps, but im thinking the battery is bad
     
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  22. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    And now the fun starts lol, if your battery is and your looking for a better battery I've used motobat twice now, generally smaller than stock and you can run them sideways, upside down, handy for hiding. Does yours have points?
     
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  23. marbleman

    marbleman Supporter Supporter

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  24. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    That should make life easier....
     
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  25. LazyPK

    LazyPK Supporter Supporter

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    Alright, I tested my battery. with everything off, it reads 6.35v. when it i turn the key, it drops to 5.75v which I don't think is enough to make a spark but I could be wrong. Does this mean I have a short somewhere?
     
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  26. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    Electric start?
     
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  27. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    I'm a rookie and horrible at electrical...I was under impression the stator creates spark and sends it accordingly..the battery runs electronics such as lights,horn...
     
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  28. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    Oops...then the stator replaces electricity used by electronics. I've avoided 6 volt system repairs...everything I've read people upgrade to 12 volt...a bit costly...
     
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  29. LazyPK

    LazyPK Supporter Supporter

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    Its a kickstart but it still needs the battery to spark apparently. (according to people on various fora)
     
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  30. LazyPK

    LazyPK Supporter Supporter

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    I noticed the 6.5v capacitor only reads 4.9v. It doesnt have microfarrings on the cap so I am not sure what those should read


    EDIT

    that might be a turn signal relay not a cap
     
    Last edited: Nov 10, 2018 at 1:39 PM
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  31. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    Weird lol. It ran before, lights wont work unless running. I would start with battery like you mentioned and work from there. All my bikes I worked on I just replaced all the cheap basic stuff to be safe. Just remembered my kids bike is an old ct70?..lights wont work unless high rpms..battery is removed....
     
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  32. Chili

    Chili Supporter Supporter

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    I have a complete 1976 model with a couple thousand miles on it, but have yet to get it running or restore it. It was my wife's grandfathers, and he only used it on his farm to get back to the house / shop from wherever on the property he was working that day (would haul it out with him on the tractor) to get lunch, tools, whatever. It was last ran and registered in 1980 and sat in his metal shop until I dragged it home a few years ago. Picked up the manual and found a bunch of sources for parts I might need, and that's where I've left it. :eek:. Paint is perfect (once polished) as is most of the chrome, though some of the plastic chrome pieces are pitted enough they just need to be replaced. One of these days I'll get to it..
     
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  33. LazyPK

    LazyPK Supporter Supporter

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    Lights work when ignition is on. I am only getting about 3v to the spark plug.... so something is happening between the spark plug cable and the battery. fuse is good, so I will just have to check everything I guess lol
     
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  34. central joe

    central joe Supporter Supporter Bushcraft Friend

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    Nice bike, I like it. I just have one question, ya gonna become the first hells angel bushcrafter young fellar? I had a lot of fun on one of those. joe
     
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  35. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    Last issue I had I replaced it with a dyna system with electronic instead of points around 350...electronic pickups, coils, wires...that was my kz550...so much easier than chasing gremlins lol...sorry can't help more...
     
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  36. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    If I had one I'd shoot for this... 22af87d4fb5e854db98fb5bbc757a88c.jpg
     
  37. marbleman

    marbleman Supporter Supporter

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    A spark plug will not read 12 volts on a meter, don't keep trying that, could damage your meter. A spark plug is using something like 10,000 volts. I'm not a motorcycle mechanic, but a good step sounds like get a new battery. Most voltmeters won't measure capacitance.

    Looks like page 54 has some electrical troubleshooting info.
     
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  38. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    I'm thinking let's start with order...
    It was running...what happened in the mean time that it's not now? Lights on alot? Running at low rpm(charging issue). Etc...
    Did you move wires? Change bulbs, flasher,etc
    A new plug would eliminate that from the list...as would a battery.
    A good running list of what you've done and are doing will help the smart guys get this going lol.
    If no one chimes in here I'd check out" sohc "or similar forums...
    Ive racked my brain for days and found a wire someone spliced in the wrong color and wasn't grounded....grrr
     
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  39. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    I wanna see this this running!! I love old hondas!
     
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  40. LazyPK

    LazyPK Supporter Supporter

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    Its my multimeter for hvac, I use it to check caps all the time for work.
     
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  41. LazyPK

    LazyPK Supporter Supporter

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    It was running, but runnning rich i think because it would putter out at idle. It was getting dark so I put it away and the next morning tried to start it. Accidentally left the lights on, so the batt had died. I charged it up but no go. So far I changed the plug and thats it.
     
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  42. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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  43. southron

    southron Guide

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    In Alabama one can get a motor cycle license for small bikes like that at age 14

    I had a 175cb that I drove all over town and surrounding county until I got my license at 16 and started driving the pickup.

    Having the means to drive to the next small town let me pick up my girl friend and go places. Probably woulda stayed out of a lot of trouble had I not had it, but picture two 14 YO kids driving to the local hamburger joint to get burgers fries n a coke.

    Thing sipped gas also.

    Ah the memories of mis spent youth.
     
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  44. Crusher0032

    Crusher0032 Appalachian Arthfael

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    Harbor freight has a tool for checking spark that plugs in between the coil and sparkplug. It's great for stuff like this because you can see as you crank whether the plugs are getting power. Theyre under $10 and would help eliminate ignition issues.
     
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  45. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    How's this look...
    honda-xrm-rs-125-electrical-wiring-diagram-with-saleexpert-me-and-new-with-rs-125-wiring-diagram.jpg It was labeled cb125...color schematics are life savers..
     
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  46. LazyPK

    LazyPK Supporter Supporter

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    I dont know if that schematic is for the cb125s or not, that has 2 spark plugs my bike just has the one
     
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  47. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    Weird all the ones I find are dual plug...
    Does yours have a selenium rectifier?
     
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  48. LazyPK

    LazyPK Supporter Supporter

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    Yes it does
     
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  49. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    Service manual (I forget marbleman posted that link) has a good trouble shooting. One thing I found out messing with bikes(or cars) if it's got original parts the rubber and plastic can be compromised...moisture issues.

    When I work on bikes that arent running I buy new battery, coil, wire, rectifier, points, fuses, flasher. That eliminates alot from the start. Then I move on to test rectifiers, regulators, stators.
     
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  50. cbrianroll

    cbrianroll Professional Tinkerer Supporter

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    Have you joined any motorcycle forums lol? I'm really a need it in front of me kinda mechanic....
     
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