15:45 that is not a resistor . it is a selenium rectifier or basically a very old form of diode . these have huge voltage drop so you can not test them with a regular multimeter and they smell very very bad when they fail. you need 4-5 diodes in series to emulate a selenium, rectifier like this. but if it gets to that point i personally would upgrade the whole charging system to something more modern. also a 6v leadacid charges at upto 7.4v and floats at 6.7 to 6.9v , so at 6.3v your charging system is not doing enough , these days you can buy 4 sony lifepo4 26650 cells from battery hookup for 6$ , rearrange them in 2s2p for 6ah 6v that will outlive any leadacid ever made.
At 6.3v the selenium rectifier is failing, as their internal resistance increases until its all over for them. I'd say the magic smoke will come out of that sooner than later, and aside from the awful smell it is also fairly toxic too. Good to keep it physically in place for the looks/history, but cut the leads off and put in a good modern charge system for sure.
@@LabCoatPaul There are a few forums and postings on updating the charge system of this specific bike. The system in place now is old school, half wave voltage to the battery and this is known to shorten lead acid life. Just a quick review of the wiring diagrams and the mods others have done, I would say any 6v four pin AC regulator module will work for you (of which there are very few on the market). There are a couple things to note, C1 and C2 have a center tap to the 'ground' frame of the bike, the battery negative is not connected to that ground, the battery is connected between C1 and C2, and the C2 line is fed through the ignition switch so you would need to understand if that switch is routing the C2 line to other systems than just the battery as you would be re-directing that line to the regulator. The wire points for your AC are from the C1 and C2 points. Good enough for a starting point though. And yes, I have had selenium rectifiers go up in the cloud of magic smoke, it is incredibly foul.
I see many videos where they tell you how to fix things but dont actually show you how or disassemble anything on camera. I know these arent necessarily tutorial videos and but they do a great job at educating
4:05 That is a diode not a resistor. It's called a selenium diode. They all have that very unique shape. The old ones tend to go bad and you can replace it with silicone.
Hello lab coat, Paul, as I mentioned before my other comment that red finned thing you’re calling a resistor is actually a selenium rectifier. It’s a poor rectifier because of its high resistance. Honda made use of this property to limit the charging current and thereby act as a poor voltage regulator. If you replace that selenium rectifier with a silicon rectifier and a voltage regulator, your battery will last longer and battery voltage will be stabilized.
Hello lab coat, Paul, I forgot to mention I love watching your videos you are so clear and I appreciate the humor. Also, I’ve been repairing motorcycles since my first motorcycle in 1965 when I was 15 years old, watching your videos has revitalized my interest in getting an old bike and fixing it up.
Hello lab coat, Paul, that thing that you called a resistor is actually a selenium rectifier. Early use that instead of silicon rectifiers because the resistance of the rectifier also allows the selenium rectifier to act as a voltage regulator. So the resistance limits the amount of current the alternator can put to the battery. very crude a cheap. Hope this helps
Really appreciate all the close-up and clear shots. I've been working on my grandpa's CT70 for the past couple days. After taking the carb apart 3 times, I'm hoping I can get it running today. So far I've had it fire up, but it won't idle or run unless the choke is fully closed
If it only runs with choke on, you might still have plugged jets or passages in the carburetor. Soaking it in solvent is a good idea, but don't use something acidic or basic (like simple green) because it will corrode the aluminum. Try shoving strands of copper wire through holes and blowing compressed air through them to free up anything that might be plugged.
Hey Paul, love your videos, you're doing great job, explanation is thorough and without extra fluff. I have one question, my gy6 157qmj has charging problems. I was going down the road and my dashboard,turn signals, head/tail lights, alarm system, battery fuse and anyting electrical you can think of blew out. I tore everything apart and cable coming from stator was pinched, green(ground) and yellow wires were melted and shorted together. I had replaced stators in the past, 2 or 3. I am getting ac power on litteraly every wire and even on frame of scooter. I replaced stator with new one, everything same, besides i have not installed any new lights or dash because i am afraid it will blow again. What im wondering is on every stator i have replaced all yellow and white wires are already grounded (wire starting the coil is already soldered with ground). What im wondering is why it blew all my electrical system. Any thoughts? Maybe i wrote too much. Any advice is appreciated, thanks 🙏
The yellow and white wires should not have continuity to ground. Chinese scooter parts tend to have very bad quality and I wouldn't be surprised if the new parts you bought have something wrong with them. If you want to pay a little extra and have your problems go away, buy the 11-pole upgrade kit: www.rollingwrenchdenver.com/products/gy6-charging-system-upgrade-kit-8-pole-to-11-pole-stator You may be able to find the same kit at a better price, but I've tried the rolling wrench kit and it worked great. Watch this video: ua-cam.com/video/FCiSSYDfpMM/v-deo.htmlsi=ssLF4d0b_NvKZz1m
@@LabCoatPaul Man, you are the GOAT. Your attention to details and wit are hard to find nowdays, i watch all your content and keep learning. I did not even expect that fast answer, thanks ALOT, god bless you.
Watching your videos I slowly set my mind around preparing to run my Vespa lx-v 125, which has not been used since 2019. I still need to wait for warmer temperatures, today it is 0*C in my garage.
Yes they did. I have both a 3 speed transmission model (with out a hand clutch it's semi automatic) & a 4 speed transmission model with a regular left hand clutch. They are both from 1971 manufacture dates.
Clean little Honda trail Paul 💯. I'm a firm believer in the cleaning power of a roommate toothbrush 😂 lol. One of the most valuable tools in the arsenal 🪥😁. Thanks for another great 🎬✨️👏👏👍. Salute 😎
Excellent video as always. I really enjoy the explanation, commentary and the jokes here and there. Keep the amazing job Paul!!!
Maybe that switch on the gas cap is to seal the vent so that you can lay it on its side.
Yes
It's mostly a vacuum port; it covers or uncovers a tiny breathing hole in the cap. Gas won't flow well or at all if it's closed.
15:45 that is not a resistor . it is a selenium rectifier or basically a very old form of diode . these have huge voltage drop so you can not test them with a regular multimeter and they smell very very bad when they fail. you need 4-5 diodes in series to emulate a selenium, rectifier like this. but if it gets to that point i personally would upgrade the whole charging system to something more modern.
also a 6v leadacid charges at upto 7.4v and floats at 6.7 to 6.9v , so at 6.3v your charging system is not doing enough , these days you can buy 4 sony lifepo4 26650 cells from battery hookup for 6$ , rearrange them in 2s2p for 6ah 6v that will outlive any leadacid ever made.
At 6.3v the selenium rectifier is failing, as their internal resistance increases until its all over for them. I'd say the magic smoke will come out of that sooner than later, and aside from the awful smell it is also fairly toxic too. Good to keep it physically in place for the looks/history, but cut the leads off and put in a good modern charge system for sure.
@@keeperofthegood every electronics person should smell that "resistor" for once in life.
@@KuntalGhosh Thanks for the information!
@keeperofthegood
Is there a certain charging system upgrade kit you recommend?
@@LabCoatPaul There are a few forums and postings on updating the charge system of this specific bike. The system in place now is old school, half wave voltage to the battery and this is known to shorten lead acid life. Just a quick review of the wiring diagrams and the mods others have done, I would say any 6v four pin AC regulator module will work for you (of which there are very few on the market). There are a couple things to note, C1 and C2 have a center tap to the 'ground' frame of the bike, the battery negative is not connected to that ground, the battery is connected between C1 and C2, and the C2 line is fed through the ignition switch so you would need to understand if that switch is routing the C2 line to other systems than just the battery as you would be re-directing that line to the regulator. The wire points for your AC are from the C1 and C2 points. Good enough for a starting point though. And yes, I have had selenium rectifiers go up in the cloud of magic smoke, it is incredibly foul.
These bikes last forever. My grandad has one he still drives, and he got it in 1973
I see many videos where they tell you how to fix things but dont actually show you how or disassemble anything on camera. I know these arent necessarily tutorial videos and but they do a great job at educating
4:05 That is a diode not a resistor. It's called a selenium diode. They all have that very unique shape. The old ones tend to go bad and you can replace it with silicone.
Hello lab coat, Paul, as I mentioned before my other comment that red finned thing you’re calling a resistor is actually a selenium rectifier. It’s a poor rectifier because of its high resistance. Honda made use of this property to limit the charging current and thereby act as a poor voltage regulator. If you replace that selenium rectifier with a silicon rectifier and a voltage regulator, your battery will last longer and battery voltage will be stabilized.
Hello lab coat, Paul, I forgot to mention I love watching your videos you are so clear and I appreciate the humor. Also, I’ve been repairing motorcycles since my first motorcycle in 1965 when I was 15 years old, watching your videos has revitalized my interest in getting an old bike and fixing it up.
Hello lab coat, Paul, that thing that you called a resistor is actually a selenium rectifier. Early use that instead of silicon rectifiers because the resistance of the rectifier also allows the selenium rectifier to act as a voltage regulator. So the resistance limits the amount of current the alternator can put to the battery. very crude a cheap.
Hope this helps
He doesn't say why today's carbs have the petcock pointing down for run. Not the same as the originals. This guy doesn't have a clue.
Thank you god such a great video. Please make more contents with the CT 70
Really appreciate all the close-up and clear shots. I've been working on my grandpa's CT70 for the past couple days. After taking the carb apart 3 times, I'm hoping I can get it running today. So far I've had it fire up, but it won't idle or run unless the choke is fully closed
If it only runs with choke on, you might still have plugged jets or passages in the carburetor. Soaking it in solvent is a good idea, but don't use something acidic or basic (like simple green) because it will corrode the aluminum. Try shoving strands of copper wire through holes and blowing compressed air through them to free up anything that might be plugged.
hey mr paul im commenting here since its your most recent vid but i have a 4door 99 rav4 and im doing a swap with a 3sge vvti engine
Some how riding these small bikes feel like one is going very fast even at 30mph.
im more impressed how fast you shift. im still over here riding a scooter
Here in Pakistan, people use basically the same bike for intercity travel, with four children, wife, and a bag of luggage on the carrier....
That's awesome. We don't use them to their full potential here.
i have a gl1000 i need rewired ....wish you were nearby lol
The road is crying HELP!!
The resistor is a rectifier.
Great video! Thank you.
I have one that runs but the carb leaks
Hey Paul, love your videos, you're doing great job, explanation is thorough and without extra fluff.
I have one question, my gy6 157qmj has charging problems. I was going down the road and my dashboard,turn signals, head/tail lights, alarm system, battery fuse and anyting electrical you can think of blew out. I tore everything apart and cable coming from stator was pinched, green(ground) and yellow wires were melted and shorted together. I had replaced stators in the past, 2 or 3. I am getting ac power on litteraly every wire and even on frame of scooter. I replaced stator with new one, everything same, besides i have not installed any new lights or dash because i am afraid it will blow again. What im wondering is on every stator i have replaced all yellow and white wires are already grounded (wire starting the coil is already soldered with ground). What im wondering is why it blew all my electrical system. Any thoughts? Maybe i wrote too much. Any advice is appreciated, thanks 🙏
The yellow and white wires should not have continuity to ground. Chinese scooter parts tend to have very bad quality and I wouldn't be surprised if the new parts you bought have something wrong with them. If you want to pay a little extra and have your problems go away, buy the 11-pole upgrade kit: www.rollingwrenchdenver.com/products/gy6-charging-system-upgrade-kit-8-pole-to-11-pole-stator
You may be able to find the same kit at a better price, but I've tried the rolling wrench kit and it worked great.
Watch this video: ua-cam.com/video/FCiSSYDfpMM/v-deo.htmlsi=ssLF4d0b_NvKZz1m
@@LabCoatPaul Man, you are the GOAT. Your attention to details and wit are hard to find nowdays, i watch all your content and keep learning.
I did not even expect that fast answer, thanks ALOT, god bless you.
Really like these videos thanks for them!
Watching your videos I slowly set my mind around preparing to run my Vespa lx-v 125, which has not been used since 2019. I still need to wait for warmer temperatures, today it is 0*C in my garage.
Didn't they make a model with 3 speeds and no clutch? Like the Honda mini 50
Yes they did. I have both a 3 speed transmission model (with out a hand clutch it's semi automatic) & a 4 speed transmission model with a regular left hand clutch. They are both from 1971 manufacture dates.
When the kickstart stops working on those motors u gotta adjust where the clutch cable goes into the case. Super easy it takes like 2 min.
Thanks for the tip! I'll do that.
@@LabCoatPaul yeah the adjuster thing is behind that round plate on the clutch cover
What a beautiful piece of engineering marvel!
Note that only the gas tank is plastic. Screams quality.
Nice
Nice!
thank you for this video Paul I thoroughly enjoyed it
Nice bike Paul. Good job fixing it up.
Thanks for the Video! Great fun to watch :)
I wanted one of those so bad when I was kid!👍
can i use 10 40 engine oil in my scooters transmission
Yes. Most small Honda motorcycles and scooters can use the same oil in the engine and transmission.
@@LabCoatPaul i need help with my Xa125cc scooter
@@boosie4182 Check out my Chinese scooter playlist: ua-cam.com/play/PL1_JDBt1LSiJQETjZiOFXBKtv-ZzfqEx0.html
Clean little Honda trail Paul 💯. I'm a firm believer in the cleaning power of a roommate toothbrush 😂 lol. One of the most valuable tools in the arsenal 🪥😁. Thanks for another great 🎬✨️👏👏👍. Salute 😎
I rode one as a teenager back in the 70's.
It looked better than this on, because it was red, not blue.
Makes a lot of difference in performance.
Red is always faster