Dual Mode Muffler & 12V to 6V Conversion | Honda CT70 Mini Bike
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- Опубліковано 10 лют 2025
- A few weeks ago I swapped a 4 speed manual 140cc racing engine onto my 1974 Honda CT70. The new Chinese 140 is much torquier than the original 72cc engine on the Trail 70, but I didn't gain much top speed. In this video, we're fabricating a new freer flowing exhaust for the CT70, and using resistors to make a 12 volt charging system work on a 6 volt headlight. We then find out that this engine doesn't have a charging system! Ugh!
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Happy birthday John and keep up the good content C&C!
The audio is sooooo good 😯
ikr
If you buy an electric start motor with bottom starter it will fit and has a charging system for the starter Battery and can run lights also. Hope this helps, mine works great.
I've had that same exact problem that you guys are facing...the thing that I found out is to use the spark plug voltage..but in order to do that you need a voltage rectifier to regulate the voltage between the high voltage and low voltage so you could actually charge up a light and run it I've done this with my dirt bike and it works perfectly fine it charges the battery it works with the light..you'll just need to hook it up between the the coil pack and the flywheel all you need is the ground wire and the wire that hooks up to the coil and then you can hook it up to a bridge rectifier i have a 12 volt drill battery on mine and works great...green is ground..
You guys rock! 40mph is a serious wreck in shorts and a 3/4 helmet. God bless!
Hey Guys...you can sweat out the 6v bulb and replace it with a 12 volt. I've got a video showing how I went from an incandescent to a halogen on a similar light. Takes a little time and patience, but it's definitely doable. My video is titled: Repairing Sealed Blown Motorcycle Headlamp. Cheers guys! Zip~
They did it for a reason.
It usually comes out vac the stator. You could also switch the way the flywheel go's so that you can generate voltage. Usually need a rectifier/regulator to convert to dc
on that 140 you would want AT BARE MINIMUM 24mm 26mm would be optimal the carb that is, the exhaust pipe should be 28mm ID.
If you pull the flywheel on the 140 there should only be 1 charging coil for the ignition (the smaller black coil). as you could see there was a small black one on the 107 AND a bigger yellow one which is the accesorie coil (lights etc) take the yellow coil from the 107 and bolt it on to the 140 Becasue there should be 1 extra mounting Point for Another coil on thev 140 ignition system
Or go to TBolt usa and buy a performance ingition system THAT has the lighting coil
Listen to this guy! That carb is too small and so is the exhaust. A 212 predator makes a hell of a lot less power (and at lower RPM) than a Lifan 140.
So are you agreeing with me or Are you saying im wrong because if you are saying im wrong im kinda mad.
Agreeing! Sorry if I wasn't clear. I was telling the Cars and Cameras guys to listen to you, haha.
Brendan Doyle alright good to hear another person with some knowledge around here👍🏻
You are right it does indeed have the coils under the flywheel, I've worked on one of those and you can modify it like you said.
Happy birthday John whenever it is
If y'all go back to Busco beach near the end of summer, I'll have to bring my son and grandson on a road trip. We have an enclosed trailer to bring our toys in. It'd be cool to meet and ride with you two.
Thanks guys for another great video. It sucks that engine won't work.
The best channel on UA-cam right here!
Use a RC car style 12v battery pack. U can get a few of them for cheap and keep them charged. The size it what make the so perfect for a mini that doesn't have a permanent changing system... Tried & true method......
You will have to buy another magneto of Amazon. I had that exact engine and had to do that. I ran lights on my SSR 140, get a SSR magneto for that engine. Same thing
Most of these 140’s come with a 24mm mikuni and a lot of people upgrade to 26mm.
i have a 26mm on my 90cc
I had no idea! Thanks!
yeah I was gonna point out that even my 125 pit bike runs a 26 oko
I have a 30mm on my 110cc with racing cam(something like 7mm lift) and racing exhaust. 24mm is enough, just upgrade the cam and change the CDi+ignition coil.
yes ,,the carb that camewith mine sucks
You guys need to look into getting an app called track addict. It allows you to set up courses in your or wherever and keeps times based on gps and would allow you to look further than just the time it took but the g forces experienced at different parts of the track acceleration abd deceleration and a lot of other data that you could use to really analyze your carts and see how they stack up. I love your videos keep up the good work
Good idea for track times but GPS is not accurate enough (especially on a phone) to measure acceleration effectively
I’d go Lifan 125cc electric start and kickstart, 4 speed manual. That’s honestly the best combination of options!
The stator "charging system" has 2 #3 Phillips screws behing the flywheel that can be easily swaped out for one with a proper charging system, also run a 26mm or 28mm carb, and get a big bore exhaust system, thatll make a big difference
Throw a battery in there with LED light bulbs, a battery will run those lights for a good while before needing charge. just throw the battery on the charger every night to top it off for the next time.
Nate Van Bynen Exactly what I did for my MR175. It has a CR125 CDI, which means no lighting coil.
I salvaged some 18650’s from an old laptop battery and wired them in a 4-Series/2-Parallel configuration with a BMS. Regulated the 14-16V down to 12V and wired on a LED light bar.
That was I was thinking too.
Nate Van Bynen
I used 3 18650 batteries on my bike. A charge lasted about 4-6 hours of riding with the headlight and brake light on. Charged in an hour.
If I'm not mistaken I think that bike already has a battery compartment so size constraints aren't an issue. Throw a regualr lead acid or SLA batter in there and have all the Ah needed to run lights for days before ever needing a charge.
Nate Van Bynen I used to have a Yamaha 90cc it took a 6V-4Ah battery; if I’m not mistaken, the CT70 uses a similar spec battery and sealed beam bulb.
These bulbs are 6v/35 watt, and if my math is right, can draw up to 6 amps. Which means that battery is dead in less than an hour.
Oh ya Happy Birthday Jon
Get a lifan 140. They have charging systems and make good power. A good swap guide would be great as there’s none on UA-cam. The 140 has like 3 more hp than the 125. Definitely worth it.
Dude why do you need a guide, just cut the old one out, make mounts, done
Cooper Dyment yes they do lol I think the 140’s make around 10
seniornuggtes nah isn’t that simple there’s a lot of wiring to make everything work such as turn signals. Key, neutral light, etc.. also you’re going from 6v to 12v so you need to either drop the voltage or convert everything to 12v
I'll check em out
CarsandCameras go with piranha 140 motor. They have the additional wiring off the stator to hook up lights. You can order one from wholesale-cycle.com. it's based out of Ohio and the entire motor kit with carb and all electronics is right around $400. They make right around 12-14hp.
Happy birthday John. Thanks for making the awesome videos. Say hi to Ike for me
You need a rectifier to use that charging system. That charging system is a permanent magnet AC alternator. Radio Shack used to sell rectifiers that worked for that. When they told you there was no charging system, they weren’t accurate. They just meant you can’t charge a battery from the wires as is.
i know what you mean. this little turbo i have on my car wont feed my 6cylinders. It'LL SPOOL! ... but once i connect the compressor to the intake.. its a no - go.
I know you're dealing with exhaust but it's the same thing on the opposite side of the spectrum.
46trim turbo. was worth a shot.
The first motorcycle I ever rode was a CT70, second was an ST90. Even though I personally owned a bigger bike later on, I've always wanted one of those, they're just such interesting little bikes.
A well made 125 should have more power than that 140, especially if it's high reving.
Original motor with a 108cc stroker/cylinder/head/intake kit. Did a tbparts 88cc on my z50r and it scoots now. That way everything bolts up and works like it should.
You need a DC to DC converter. Check amazon. For a DC buck converter. Don't matter what you put in . as long as its over 7 volts or so. You get 12 or what ever you want. It's adjustable. They are cheap also.
James stranger I believe you’re thinking of a boost converter.
Buck converters reduce DC Voltage, and using that the guys could reduce 12v to 6v to run the headlight, but they are still gonna need a charging system.
Trying to boost 6v to 12v off a battery will deplete it’s charge very quickly.
Need a 76 Kohler voltage regulator to AC in 1 hot DC out
I agree - sort of. There is a rotating magnet so you could fit a coil with iron core somewhere else on the outside edge, not close to the spark coil and this would generate a few watts ac output. For less than $5 you could buy a bridge rectifier and buck converter that would adjust up or down (as necessary) to give 6v or 12v (whatever you want, they are adjustable). That (with led bulbs to reduce power demand) and your done. By the way, did you check those other spare wires for AC voltage as well as DC ?
You can change the stator plates on them to run a 12v charging system. My 125cc horizontal pit bike style engine has the 12v plate and then you need a new harness as well which has 2 open wires that put out 12v dc.
Love those CT70's! I really like QA50's and almost got one but it was more than it was worth.
Try taking the needle in the slide and set it all the way lean and see what it does. There will be a small circlip on the needle, put it in the very top slot=leaner. Or if that dont work put it in the bottom slot=richer. If I remember correctly there are 5 little slots on the needle for fine tuning. Middle slot is always like the "default" place to set it. You might get a little bit more speed too. Good luck!
@carsandcameras as a former motorcycle technician who has worked on hundreds of Chinese scooters/atv/ mini bikes you need correct exhaust and carb with jetting.
as for the lighting coil sometimes the Chinese didn't drill and tap all cases for lighting if the lighting system is a/c then you need a regulator/rectifier to convert it to d/c ... Chinese did both a/c and d/c charging systems
About the 140, let it breathe. Intake, mikuni vm26. Exhaust something with a good size header and an absorption muffler, like this for example a ct 70 pipe from tb parts . Gearing like 17:31
Could the MIG welding have fried the charging system?
Old mower mufflers are the best, like say around the 80's. Their not very quiet but they have plenty of flow. Speaking of which I am modifying a egg shaped one for a performance muffler on my 3hp Flathead bicycle engine. ;)
The add before the video for alpha made e shed a tear
That 22mm mikuni carb might be a restriction. On my ssr 125 I'm running a 26mm mikuni and that is what was recommended for the engine.
Happy belated birthday John
All you gotta do is change the stator plate & fly wheel for a stator with a charge system, eBay probably has them they are very available & much much cheaper than buying a new engine, OORacing in the uk do a great one with a lightened flywheel but I’m sure u can get one in the USA , seriously easy fix mate 👍🏼
Happy belated birthday there, bud!
I have a piranha 140 kit on my 79 z50. It has a charging system and you wouldn’t need a kit if you use the other parts from that 140. I haven’t had to fix anything on mine and I’ve had it for two years now. Also, my guess would be the 15th. Either way, happy birthday!
If you can find two 6v batteries, you can charge them in parallel and connect the 12v as if they were in series. Or you could use a boost converter to make 6v into 12v. Or two capacitors in series charged off the single 6v.
Happy birthday!!!
Happy birthday dude
Happy B-Day, John.
Happy Birthday Bro :)
There is a charging system. At least part of one. The coils and magnets form an alternator. It will output some voltage ac. You will need a regulator/rectifier to convert that to the proper DC voltage and regulate the current coming from the alternator. Your alternator is probably 2 wire.
The big unknown is whether or not the alternator on the 140 has enough current output to maintain the battery with lights etc draining but that could probably be fixed with some sort of led swap.
I play around with those engines a bit, if you pull the magnet wheel out of the 140 the case should have 2 bolt holes pre tapped to install a charging coil. I robbed a Honda clone 125 with the same style as your 140 and put it into a 74 Honda 125 with the same style as your old engine. I put a full light system on my bike it runs great
check stators on a/c setting on voltmeter. Some stators put out a/c, and need a rectifier to change to DC.
On the Rd 400s we had to get cut off wheel ,trim back for bulbhouseing , apoxy new bulb in position.,let dry . Switch out plug ends put back together. ..never had problems like that .plus u have updated bulb.
The three wires coming out of the stator are providing 3-phase AC. You need to put that through a diode pack to get your rectified DC, then you can hook up a battery and run 12v to your headlight. Only worry is does that stator output enough power to support all the extra stuff and does it output enough volts to cover the drop across the diodes.
you can put that charging coil from the 110 to the 140, there are the mounting spots for it under the flywheel and its going to work like that, i did it to my engine
You can add a charging coil to the 140. When you remove the flywheel there will be a location that the charging coil will bolt into. I added a voltage regulator/rectifier to run led lights on my 125 pit pike. You can also purchase an entirely new backing plate that has both the charging and exciting coils as well as the pickup already mounted. The plate is bolted to the case with 2 Phillips screws.
Happy birthday John 😀
I hope you guys rip a huge burnout when you get to the 500,000 subs!! Congrats guys going awesome!!
Should pull the 140’s flywheel and see if you have enough room for a lighting coil, add a 6v rectifier/regulator and that would get your lights working.
If there’s coils in behind the flywheel, I would assume that the module on the outside would be the CDI trigger. It’d be worth a look to see if you can cram the 107’s lighting coil in there.
Happy late birthday John🎉🎉🎉🎂
if you had the ability to run a small electric motor driven from the engine with a regulator diode for an alternator and a rectifier for an alternator, you might be able to cobble together something that would fit inside of your size constraint in that area... but just an idea, anyways, nice build, cant wait to see how this turns out
looks like a nice led project for the future, make it so a led headlight runs of of a battery
Well at least we said Happy Birthday
HAPPY late birthday John 💥💥💥💥💥💥💥💥💥💥💥
happy birthday!!!
A better way to drop voltage is a "voltage divider" circuit using two equal size resistors with the low voltage lead attached between the two resistors.
If and when you get a new motor, I work for installation on cars and we use the AX-CAM6V when we need to power anything that needs 6v instead of 12v. It doesnt get hot but since you are using them on light bulbs and not LED lighting, and since I dont know the max amperage rating it can output, I'd recommend using one for the headlight, one for the taillight and one for the turn signals. I dont remember if you said the signals and brake light are 6v. But never the less, best buy sells them and you can have them ordered to your place pretty quick.
Let's see another build off between you guys.
But seriously, look up bicycle head lights and tail lights. There's plenty of them on Amazon and other places. They're similar to yours, but they have internal rechargeable batteries. No wiring to mess with at all. They're amazing ^^
I had a headlight on a bicycle when I was a kid. It used a little generator that made contact with the tire to charge the light. Maybe sneak one of those on it somewhere and you would have a usable headlight.
If you take the fly wheel off of the engine on the trail 70 there is a place where you can put another coil for your charging coil I had to do this to mine I’ve done the same upgrade
Happy late birthday John!!
Weren't we all wishing John a happy birthday a couple of weeks ago? lol
Happy birthday 🎂
That 3" male on both ends piece of pipe is referred to as a "pipe nipple". just so people don't have something else to hound you about! just looking out for you guys! keep up the good work!
Those lawnmower mufflers work great if you knock out or drill the center baffle
The Chinese engine won’t compare to a name brand motor. Put a big bore kit in the stock 70 off of eBay. It will be more reliable and should go faster if you gear it right!! Keep it up love the vids
You want speed, you need gear ratio change...no matter how much power you have..if you can't put it to the wheels it's useless.. Much.Love y'all. Are awesome.
@CarsandCameras use a 12v electric motor using a diode inline with the hot wire on the motor to battery so it don't back feed into the motor and use a belt drive system from the back wheel to the motor then wire it to the battery there you will have charging capabilities
I hope you guys don't give up on the charging system I know from experience working on these engines that you can put a charging system on it for very little or no cost.
Happy birthday John have a good birthday
A REQUEST!!!! Hi guys. If you can find a RUPP ROADSTER, I know you would really enjoy doing "your thing" with it. I got one for Christmas when I was 12. I'm SO sorry that I didn't hang on to it. They had a very nice frame, full suspension and a torque converter. Mine was really fast and could climb hills that my motorcycles couldn't. I know you would have a good time with it. Please look for one, you won't be sorry!
It was the 4th i remember now because the concrete for the shed outback was poured 2 days after from a video
We need more "it’ll be fine" hats for sale online!!!
You could just buy a small battery pack with 18650s, you would only have to charge it maybe once a week.
I know im 3 years late, and i just made this comment not too long ago. But if they used a buck converter to step down the voltage to 6 volts, it would last a lot longer than using a resistor as the resistor can change values with heat causing it to not work as efficiently when in warmer climates.
You could use a drone regulator for 12v - whatever you want. It allows you to turn it up or down. Depending on the voltage you need. Just have to solder it in and your good to go
Ok, this may seem a little hokie but, you could modify one of those bicycle generators that have a knurled wheel that scrubs against your tire to turn and generate power. It may not be enough to actually recharge a battery, but it may be enough to sustain a charged battery. That combined with LED lights would work for a long time.
I have a 77 Vespa ciao moped and couldn't find that 4 inch sealed beam light in 12v anywhere, so what I did was heat up and take off the glass lense then for an 1156 bulb socket and bulb and cut a hole in the back of the light housing the size for the snap in socket. Then you just put spade connectors on the wires between the socket and stock wiring.
Happy Birthday John
Happy late birthday it's a bummer you couldn't get your headlight going on your birthday I hate it for u. hope to see what engine y'all put on it next
You should weld one of those plumbing water cut off valves on both pipes leading to the mufflers so you can have super loud high power mode and stealth normal mode
needs a hotter than stock CDI box to get the most out of it. the timing advance on the stock black CDI boxes do not have enough ignition advance
What is it geared at?! first 3 gears only look like they differ 3MPH upshifting should drop the rpm a lot more then that!
Hey guys been watching for awhile. Upgrade your stator and wiring harness. Power sports maxx has a cheaper selection and same brands as go power sports, just cheaper. I installed a new stator on my pit bike and works great. Working on another mini chopper with lafian 125cc 4 stroke 4 speed. Was able to get complete wiring harness and stator and started first try. Less then 50 bucks. They do make adaptable wiring harness that are plug n play.
I love what you guys are doing with the show very very entertaining amazing content however with the CT70 I believe I would just do the ATC 110 upgrade and then you can always put bigger cylinder head on it bigger carburetor bigger exhaust and you would have automatic transmission more power more speed high low range all the good stuff keep up the good work guys
Hello from France i love your UA-cam Channel
Take that nut off the flywheel and there's a tool to pull the flywheel off. The stator plate is behind it use an impact driver with a Phillips bit and you can take it off and swap the whole stator with one that will run lights. Called a lightning stator bit you will need a rectifier also
Dustin Horn I run led all day on the system direct and it runs fine, has on several bikes
🤘🏼🤘🏼🤘🏼yee yee do it for issac
Ha Ha Corrugated cardboard! I knew a guy that worked at a paper plant and he said this often: that is not just cardboard, son....it's corrugated card stock!"
Great vid! I’d love to see some new vids with the race mower
The 140cc has three wires. Green=ground, Blue/white=trigger, black/red=Ignition charging. The black/red comes from underneath the flywheel and it provides the CDI with the energy to spark. The blue/white comes from the trigger coil on the outside of the flywheel and it tells the CDI WHEN to spark. Your system is just like an AC GY6 system but without the battery charging system.
Ike is riding almost Hawaiian style, we wear rubber slippers when riding.
I think a 125cc with a charging system would be DA BOMB.
Try the 12v led h6m conversion to the battery. I did that for my mini Baja getting rid of the 35w bulb
Why not another video of that beast of a 212 thats what i was expecting.