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-   -   Honda Cg 125 engine help needed (http://www.biker.ie/forum/showthread.php?t=243569)

datareactor 15th May 2018 10:55 PM

Honda Cg 125 engine help needed
 
Hi Guys

I picked up engine recently. want to build field bike . i have kawasaki trials rolling frame. this engine seems to be 1985-88 Brazilian engine , point based. just want to get in going , no lights required.

Engine seems to have compression.

Current problem:
---------------------

> Flywheel assembly is bit broken , as shown in the first picture.
not sure if repair is possible ?
> One of Coil was heating up. when my friend test.

Question
----------
how to repair the flywheel ? or get new type of stator/magneto .and flywheel
how to get replace the coils .. didnt find any luck on ebay.

Budget is bit tight like always .. want to get the engine going .


Any idea/suggestions are welcome.

Regards

[IMG]https://ibb.co/fY4jBJ[/IMG]
[IMG]https://ibb.co/fwLXWJ[/IMG]
[IMG]https://ibb.co/mmxPdy[/IMG]
[IMG]https://ibb.co/djPsWJ[/IMG]

datareactor 15th May 2018 11:07 PM

Re: Honda Cg 125 engine help needed
 
[URL="http://ibb.co/fwLXWJ"]http://ibb.co/fwLXWJ[/URL]

[URL="http://ibb.co/fY4jBJ"]http://ibb.co/fY4jBJ[/URL]


[URL="http://ibb.co/djPsWJ"]http://ibb.co/djPsWJ[/URL]
[URL="http://ibb.co/mmxPdy"]http://ibb.co/mmxPdy[/URL]

Sorry somehow the images are not showing ..

datareactor 15th May 2018 11:11 PM

Re: Honda Cg 125 engine help needed
 
[quote=datareactor;3536826][URL="http://ibb.co/fwLXWJ"]http://ibb.co/fwLXWJ[/URL]

[URL="http://ibb.co/fY4jBJ"]http://ibb.co/fY4jBJ[/URL]


[URL="http://ibb.co/djPsWJ"]http://ibb.co/djPsWJ[/URL]
[URL="http://ibb.co/mmxPdy"]http://ibb.co/mmxPdy[/URL]

Sorry somehow the images are not showing ..[/quote]

first picture.
[URL="http://ibb.co/fY4jBJ"]http://ibb.co/fY4jBJ[/URL]

scorpy 16th May 2018 03:52 PM

Re: Honda Cg 125 engine help needed
 
If the main HT ignition coil connected to the spark plug is heating up it may be wrecked. I assume it's heating up when you kick the engine over. A replacement should be cheap frombut almost any single cylinder coil from any older honda single, motocrosser etc will probably be ok to test it if you can borrow one. If you swap the coil with the lead plug and cap from a working bike as above and you still have no spark, then it's the pickup coil or points. The fact that it's heating up is good news, as there is current coming from somewhere. A HT coil or a bad cap could be the issue but setting as they are usually connected in 1 piece see if you can get one that looks the same from another bike.

One of the 2 coils behind the flywheel is a pickup for the ignition and the other is for the lights and charging system. Obviously for a field bike you don't need both. If it won't spark, swap the 2 over. They are unlikely to be the problem unless there is obvious damage. It looks like the bit you indicate is broken might be ok. I haven't worked on CGs before but I assume that your ignition advance done by spring and centrifuge for the points and as long as both arms can move and return with the spring it should be ok. Check the points are not pitted or very carbonized. And check the points are not earthing onto the mounting plate. Those coils are not cheap new but almost any dipole coil from a dirt bike will do, so if you need one check for a breakers yard replacement.

If it runs badly or fires and dies it may be the timing so you might need a new flywheel but try to get a spark first.

The only place I've found for older coil replacements is [url]http://www.electrexworld.co.uk/acatalog/C25.html[/url]

Like I says, not cheap.

datareactor 16th May 2018 09:08 PM

Re: Honda Cg 125 engine help needed
 
Thanks Scorpy for taking time to reply.

that how we tested .. connect the battery to rotor wires . try to spin the flywheel to see if there is spark in points. one coil was heating up.

Blanka 16th May 2018 11:23 PM

Re: Honda Cg 125 engine help needed
 
There's the workshop manual for it. [url]http://die-kleinkraftrad-ig.de/wissensdatenbank/reparaturanleitungcg125.pdf[/url]

scorpy 17th May 2018 12:08 PM

Re: Honda Cg 125 engine help needed
 
[quote=datareactor;3536966]Thanks Scorpy for taking time to reply.

that how we tested .. connect the battery to rotor wires . try to spin the flywheel to see if there is spark in points. one coil was heating up.[/quote]

What battery voltage did you use? That engine won't need a battery to kick out a spark.

datareactor 17th May 2018 11:12 PM

Re: Honda Cg 125 engine help needed
 
we put 12v .. not sure if the coils were 6V. might have toasted the coils?
I agree we dont need battey , but we dont external HT coils at the moment.
sorry bit newbie here

Thanks & Regards

dePeatrick 17th May 2018 11:22 PM

Re: Honda Cg 125 engine help needed
 
I have a scrapped CG here but can't be sure of parts but you are welcome to them...

datareactor 17th May 2018 11:40 PM

Re: Honda Cg 125 engine help needed
 
dePeatrick Thanks for your feedback. Appreciate it

Im interested , I can have a look.

if you could give your detail on to my datareactor AT yahoo.com

Regards

dePeatrick 17th May 2018 11:45 PM

Re: Honda Cg 125 engine help needed
 
Ok, will do...

Smurf59 20th May 2018 11:57 PM

Re: Honda Cg 125 engine help needed
 
[quote=datareactor;3536824]Hi Guys

I picked up engine recently. want to build field bike . i have kawasaki trials rolling frame. this engine seems to be 1985-88 Brazilian engine , point based. just want to get in going , no lights required.

Engine seems to have compression.

Current problem:
---------------------

> Flywheel assembly is bit broken , as shown in the first picture.
not sure if repair is possible ?
> One of Coil was heating up. when my friend test.

Question
----------
how to repair the flywheel ? or get new type of stator/magneto .and flywheel
how to get replace the coils .. didnt find any luck on ebay.

Budget is bit tight like always .. want to get the engine going .


Any idea/suggestions are welcome.

Regards

[IMG]https://ibb.co/fY4jBJ[/IMG]
[IMG]https://ibb.co/fwLXWJ[/IMG]
[IMG]https://ibb.co/mmxPdy[/IMG]
[IMG]https://ibb.co/djPsWJ[/IMG][/quote]

Hi eBay item number 123127984799 going cheap

Smurf59 20th May 2018 11:58 PM

Re: Honda Cg 125 engine help needed
 
Hi there EBay. Item number 123127984799 going cheap


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