DIY Approved

@honda cbf- Nice guide on cleaning carburettor. I have bought a stunner for my younger cousin brother and the guide is nice.
All extreme owners who has been after my life for posting a DIY on carb cleaning can follow this.The carburettor is same as extreme(keihin make) only smaller and different jets and different needle.

Some pointers:-
1. Never use tooth brush to clean carburettor. They are too hard and will scratch the throttle body. Instead use 1/2 inch paint brush as i have used in my chain cleaning guide.
2. Do not use kerosene in cleaning the carb. Use petrol to clean. Kerosene was used to clean chetak and vespa scooter carbs.
3. Taking out the slide- first with fingers remove the diaphragm edges and then pull the slide out.

Thanks a ton for your help, I tried removing the carb on my stunner but couldn't because the rubber hoses were too tight. Yours seem to come off easily.

Is it necessary to remove the jets and other screws and check them as I am afraid it wouldn't be easy to put them back in the same way. Or is it enough to clean the float bowl. How is your engine sounding after carb cleaning, guess its got lot smoother now.

Thanks

That is Throttle Position Sensor/potentiometer. It is better if you don't remove it. Just disconnecting the connector is enough.
I am not 100% sure about Stunner but in cars I have seen that the TPS is aligned and adjusted using a relatively complex procedure and this setting is lost if you don't mark the factory position of the torx screw-body alignment before removing it,usually the screw is covered with some kind of epoxy .
I think it is not much important in-case of carbureted bikes but still it can make some difference.

Other members can correct me.

Sorry for being late guys. There wasnt any notification from this thread, so wasnt checked in

Thanks for appreciation Sibun. Points taken. BTW, why not to used kerosene? its the cheapest de-greaser any can find..

nah.. it wasnt easy. taking carb out from those rubber hoses take good amount of force, just do it with caution or else damage can happen.

best way is, push the carb towards the air box hoses, (this hose is softer the engine intake one) by about 1 cm. then hold the engine intake hose and push it towards the engine by about 1/2 cm. by now, there will be enough space for push-pull / back-forth movement for the carb. keep trying with the movements and carb will be in your hands in couple of minutes.

but before taking the carb out, disconnect the petrol tube from carb, by reaching it from behind. It can hold it (carb) in its place.

And jets are the most important things along with diaphragm and slide. only cleaning the float bowl wont work. Actually float bowl will always (I mean whenever you open it) contain some dirt, it doesnt cause any problem.

carb was pretty clean already. wasnt causing any problem. only reason of doing it was fixing that choke cable error

oh!! wasnt sure of that. Thanks for clarifying me. BTW, with "remove" I meant disconnecting the connector only. Not that undoing of screws..

Can you please explain more about the TPS. What will happen if I ride the bike disconnecting this?

If you ride with TPS (Throttle Position Sensor) disconnected, bike will not behave in a manner it should. worst case, you wont be able to ride it (though I dont think its possible).TPS helps change pre set maps for performance, mileage, etc based on the readings of throttle opening. Actually, Fuel injected systems are more dependent on them.

Re: Stunner Carburetor Cleaning

[MENTION=36689]Honda_CBF[/MENTION],

Nice guide that helped me trace down the fuel screw on the carb. Thank you so much for the detailed pictures & the post as a whole.
I too own a 2010 Honda CBF125/ Stunner which has clocked about 24K kms. I have never faced any issue with the bike until recently when the FE has gone down from the previous 60-65 KMPL to about 50-55 KMPL. This happened after I took my bike for a long ride of about 1000 kms which obviously involved some high speed runs and hitting the top speed quite a few times. Since then, I am not able to get the FE I used to get. Tried tuning the carb a few times, but with limited success. The inaccessible fuel screw makes matter worse for tuning it perfectly.

BTW, what is the factory setting of the screw? Like how many turns after a full close?

Thanks in anticipation of help,

Regards,
Saket

Re: Stunner Carburetor Cleaning

I never got to know the factory setting.. But at 3.75 turns its slightly richer then factory setting.
Btw sorry for late reply..

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Re: Stunner Carburetor Cleaning

Is the carburator similar to that of fz16.fz uses mikuni bs 26 cv carb.
I am facing some carb problem.

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Re: Stunner Carburetor Cleaning

No i think fz has bigger carb

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Re: Stunner Carburetor Cleaning

Finally, looks like the monkey is off my back. I ran into some more problems but glad that finally everything looks sorted. People looking for information regarding the TPS on the Stunner's carb - it is the Throttle Position Sensor. It reads the opening of the butterfly based on the throttle input. This helps to advance or retard the spark plug timing of the bike depending on the engine RPM. It is not that the bike will not run without the TPS, but obviously the performance & efficiency will go down as the timing will not be optimal without this sensor.

Recently my bike encountered a problem and I had a tough time getting it diagnosed. The bike would idle very high in the morning and whenever some throttle input twas given, the revs would climb to 2-3K rpm and would come down very slowly. If left to idle, the engine would finally stall. I checked for any leak, tried adjusting the AFR (if you ride a stunner, you would know how difficult this is), lubricated the choke cable and what not. Finally my FNG was able to find the culprit which was a bad choke cable. Bought the choke cable from Honda ASC for Rs. 67 and paid the FNG guy Rs. 40/- to fix it. The bike is now doing great and idling smoothly at 1K RPM. Will report the FE soon.

Hope this will be useful for someone who runs into a similar problem.
Thanks.

Re: Stunner Carburetor Cleaning

This type of choke design is faulty.. The spring which keeps the choke valve or piston keeps it close losses its tension or gets rusted and hence the choke comes to operation

This thing has troubled me twice in almost 3 years of ownership. And after that i have disabled the choke.

Re: Stunner Carburetor Cleaning

Yes, you are right. I had to take out the spring, dust out the accumulated rust and apply little grease to avoid rusting further. However, this was the first issue with my bike wrt the choke in my 4.5 years and 26K kms of ownership. Apart from that, the bike has been always reliable like most Hondas