Honda cg125 choke help plz

[moo1971uk]

Hello all, can anyone help me with the choke on a cg125 2002 51plate.
The problem im having is this, there are three settings for the choke, i push the choke upwards as far as it will go ( the engine cut's when ticking over) i put the choke lever down 1 level (middle) the engine is fine ticking over & runs ok, i put choke down to the last setting & it runs exactly the same as middle... doesn`t rev faster or slower between the 2.

why is the engine cutting on the top setting?
& shouldnt there be a tick over variation between settings instead of just 1 cuts engine & other 2 settings run exactly the same??

be grateful for any help people can give, im new to the bike & cant find anything out about the settings, i have tried.

Oh another thing, is there supposed to be a tiny hole in the underside of the exhaust?? its about 1cm maybe .. like a drilled hole perfect drill hole??

thanks

[moo1971uk]

Thanks for the reply Yokogeri
So full choke is push it fully upwards,

Glad you could tell me the setting for the choke to be off that is what i was really after knowing. as long as i can start it with no problems & it runs fine with NO choke then i feel i dont have to worry.

You have been a help & thanks again

[moo1971uk]

Im saved from the dark choke path lol
I thought the revs would have changed when it was ticking over between the 2 settings that dont cut the bike?

&... why does it cut when i put choke on full?
i thought it would have revd more with choke on or have i got it all wrong??

I need the answers oh wise one for my inquisitive mind lol

But as long as im not running with the choke on, smart mate.

[mchaggis]

The choke on a CG125 carburettor (and on most carburettors) is a plate which is actuated by a sprung lever, pushed by the hand operated lever, which has three positions.

The plate revolves about a spindle across its face. The plate is normally edge on to the airflow, and as such, presents little obstruction to the flow. As you pull the lever up, the plate turns so that it presents more of its face to the flow, blocking more of the area.

This smaller cross-sectional area makes the air flow faster (in order to fit the same amount of air through a smaller gap it has to flow faster) and so reduces the air pressure. This 'increased vacuum' sucks more fuel through the jets and so makes the engine run richer.

The reason the engine stalls when you put the choke on full is either because the choke plate entirely closes the carburettor body and no air flows, or because there simply isn't enough air to burn enough fuel to keep the engine turning over.

See the attached diagram for a very simplified schematic of a CG carburettor.
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I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.

[map]

CG125 choke was covered in another thread also - click here - for info.

Without seeing it not sure but IMO the hole in the exhaust on the underside is probably a drain for condensation. When you start the bike after a spell stood idle you may notice water droplets from it. The theory is it should help slow down the exhaust corroding from the inside out (but it will eventually anyhow, due to the nature of the gasses acting on the metal - creates an acid).

HTH
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...and the whirlwind is in the thorn trees, it's hard for thee to kick against the pricks...
Gibbs, what did Duckie look like when he was younger?

[moo1971uk]

a massive thanks mchaggis that is the information i was after. i appreciate your help & for taking the time to put my mind at rest
cheers mate

same to you mr map

only problem i have now is i bought the bike on saturday & the head is leaking slightly, there is oil underneath & last but not least the freakin fat nut for the forks/ centre nut below speedo as ya look down from above... has come off.... nice lol
bought it from a shop & its going right back to were it came from.

But i do like the cg so i will have another, but probably from somewhere else, i need it like yesterday... freedom to me cos i dont drive a crappy car, nor want too.

[xTZRx]

Hi, im new here i have buyed a new CG125 I started it today after 4 days and it was on high revs for some reason i dont understand why, I started it twice and both times it was reving high before i got scared and just turned to key incase the engine blows, is this what "Idle" is called? and can you tell me how long it will be on idle or high rpm. Also the choke was swicthed on first time and the second time i switched it off but same, high rpm both times.

PLZ PLZ help me i've just bought this and its my first bike!
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xCDIx125x

Razz39@hotmail.com

[tutton]

^ Idle is what the bike ticks over at when no throttle is being subjected.

Maybe your chokes stuck on, as my rpms rise high with choke on,
or maybe just your idle screw is would in too much.
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Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

[xTZRx]

Yh i went and checked my Bike now and noticed that after i accelerate it doesn't seem to release the throttle so i need to push it to release the throttle, this might have been the problem but im gonna check it out in the morning as i have no college.
____________________
xCDIx125x

Razz39@hotmail.com

[xTZRx]

I just went out and checked with choke off, but bike was still idling very high sounds like 4500+ RPM, how can i sort this out?

MSN Razz39athotmaildotcom
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xCDIx125x

Razz39@hotmail.com

[tutton]

Id guess the cg125 is still a carbed bike,
Find your carb, has pipes down from fuel tank, and a air pipe in from the airbox,
and adjust the screw when bike is hot like in the picture below
https://www.teamcalamari.com/pix/24mm/7a.jpg

or its just the screw on your carb on the far left usually. sometimes middle, just count how many times uve wound incase u need to get it back to what it previously was.
____________________
Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

[xTZRx]

THNX alot TUT,
i found the screw but still no luck, i think the cable is sticking, gonna open it tomorrow and check it out.
I was gonna say something but i have forgotten now lol
____________________
xCDIx125x

Razz39@hotmail.com

[xTZRx]

[herbert111]

I was riding my cg125 the other day and found whenever I went over about 60 my choke leaver would vibrate itself into the on postions. This caused the fuel to become too rich and leave me at the side of the road for a bit until I sort it out.

I was wondering if anyone else had a similar problem and found a cure for it, or if it is to do with the fact that when I was investiating the leaver at home found that it is sprung into the on position, relying on the friction of the switch next to the bracket to hold it in the off position?

Cheers

[LittleWoman]