CG125 running only on choke

[Tamsin]

Hi guys

2001 CG125 with kickstart only CDI engine.

She was running absolutely beautifully until she was left unused for approx 2 weeks now she will only run with the choke in the second position (choke has 3 positions, off, on and extreme) even when fully warm switching to off results in her cutting out.

nothing has phyiscally been changed and the only difference is that she was laid up for 2 weeks.

Seems fairly obvious its some kind of fuelling issue but what are my best course of actions?

[Fizzer Thou]

It sounds like condensation in the float chamber.

Just drain it off into a container and see what appears.Then leave the fuel tap on for a while so as to wash it through

If all else fails then check the pilot jet
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Just talk bikes.What else is there?

Always have a 'Plan B'

[Tamsin]

Wouldn't have thought of that... will have a look tomorrow

[spannermonkey...]

Possible air leak at the carb. Like the inlet rubber split or fallen off. or the carb to engine rubber is split or not fixed down enough.

If your engine is sucking in more air it will run lean so opening the choke to get more fuel in. Depending if your choke is fuel or air controlling.

Good luck the post above could be right also. Modern fuel is rubbish. I've had bikes that run pants after leaving just a few days. That resulted in stripping and cleaning the carbs and would run fine till it was left alone for a while. best thing to do is, on your way home, turn the fuel tap off just before you get home, you have to learn how far away to do it, so the carb is then empty when you arrive home.
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Current machines - Aprilia RS250. Kawasaki H1A 500. Past machines - Kawasaki ZX7r P6, Yamaha RD250E (the one that got away), BSA Racing bantam (revs over 10'000 sweet as), Yamaha RXS100, Suzuki GP100, Suzuki GS500K2 - best all year machine ever - come rain, sleet and snow just epic.

[Tamsin]

choke restricts airflow through carb.

[Tamsin]

oh yeah, and its missing at high revs too.... never did before

[WD Forte]

Its a very simple carb, best to whip it off and check and clean it
check the fuel flow from the tank as well
If you have a vac tap, check the hoses for leaks.

We have the same ( OK copy) carb on the lads Kymco
When it started to suddenly run rough I noticed the choke flap
(shiny thing upper right in the picture)
had lost contact with the lever ( black thing) and was flapping about
Its easy to check and fix
https://i00.i.aliimg.com/wsphoto/v0/1763450896_1/PZ26-Carburetor-26mm-Carb-Cable-font-b-Choke-b-font-For-font-b-HONDA-b-font.jpg
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bikers smell of wee

[Tamsin]

That is an interesting idea!

As soon as fizzer came back with their response I figured it was worth whipping the carb off and giving it a bit of a clean up

[blurredman]

Maybe the idle jet is clogged.

Check the jets
____________________
CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 18k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 40k, 1989 MZ ETZ251 - 51k.

[Tamsin]

Update...

Carb off and thoroughly cleaned. There was a tiny bit of grot in the float chamber but that was the only problem I could find. All reassembled and now she runs....

[moonzoomer]

[Tamsin]

I think she needs a new fuel pipe anyway so I will sort that and put an inline in at the same time...