[interc00led]

Originally Posted by sagarpadaki

I am facing similar issues wherein my mother's TVS wego is switching off at low speeds.Multiple mechanics have not been successful at solving it.Does such a mechanism exist in all carbs?

There is a pilot circuit/ slow jet in the carburetor which is responsible for idling and part throttle operation.
Clean the jets and inspect the air/fuel screw o-ring.

[eko]

Dust sticking on intake manifold or carburettor is a tell tale sign of vaccum leak and will lead to poor idling. If multiple mechanics could not solve the problem try immersing the carburettor in a solvent like paint thinner for atleast 12 hours after removing all rubber parts.

[KaandBaaz]

Guys, i am facing a strange issue with my 2009 Activa. It has run 25000kms. It was used by my uncle in the past post his death I have been using it from the last 1 year. The said bike has a strange problem. It has visited many different garage guys but nobody has been able to solve the issue satisfactorily. Post the garage visit the bike runs smoothly for 30-40 days and post that comes back to its erratic behavior.

Now coming to explaining the real issue, I dont know how to put in words but I feel the bike is choking to death suddenly when in motion. It gitters,shudders, mis-fires and suddenly loses power. Also there is loss in pick-up when riding with a pillion or climbing a steep slope. The solution currently I am trying is whenever I feel the bike is about to stall or starts vibrating , I put it on double stand and rev like a crazy lad for a minute or two, while cursing my fate(this surely gets me looks from the public on road).

Can anyone please guide me as to what can be the issue? I have received suggestions from garage guys - rebuild the engine, change carb, change spark-plug, change wiring and all sorts.

TiA

[eko]

U mentioned the problem starts 30 to 40 days after visit to garage. I have observed on Honda, the carburettor flange becoming lose on its own due to vibration. This could be a reason for erratic behaviour.
Next reason could be blocked air vent on the petrol tank cap. Open the petrol tank cap when missing occurs and see if problem disappears.

[bkc]

Originally Posted by Crankpin

It's not the "Fuel screw" it's the "Air screw". These carburetors have an Air screw adjustment.

One more easy way to know this is, by knowing the location of the screw in the carburetor.

If it's nearby engine, it controls fuel, so, turning it clockwise will make the mixture leaner, imagine a water tap.

If it's nearby Airfilter hose, it controls air, so, turning it clockwise will make the mixture richer by reducing air.

This holds good for all carburetor. It's better to tune when the engine is hot, else you'll lose the crisp at slow throttle speed.

Originally Posted by a4anurag

engine idling

Like your posts, be it intercooler cleaning, injector cleaning, this idling thread. Thanks bro.

[Crankpin]

How much running has the bike done ? Check your spark plug and change it even if it looks ok. Get the carburettor cleaned thoroughly and also check the flanges where it’s mounted. Make sure there isn’t any leak in the intake.
Avoid reving the engine too hard.
After all this, clean your fuel tank of all residue and water ingress if so.
If nothing works, you might have to check engine compression for signs of blow caused by worn rings.

I am looking for a used working Activa engine in the Pune/ Mumbai area. If anyone has any leads please do let me know.
Thanks in advance!

Originally Posted by centaur

I too have a 2.5 year old activa 125 (got it almost from the first set of vehicles I guess) and I must say I am kind of relieved looking at this thread. I have been having cold start issues from day 1 and the other regular issues as well of improper idling and vibrations. Every service these issues got reported but they were never completely resolved. Will check on the O ring now since that could be an issue

Most scooter engines are lean tuned from the factory it self to meet emission regulations.
Very unlikely that engine would run rich unless it’s set To rich.
Ideally you should not have to use the choke at all to kick start the scooter first thing everyday. Use the choke only if it’s absolutely necessary
Service centre guys don’t know how to set the carburettor correctly as they have no training in doing so. They will do what Honda tells them which is To set the carburettor to give max fuel efficiency..ie lean setting.
There isn’t any harm if you slightly turn the air screw on the carburettor to enrich the mixture. Just about 1/2 a turn clockwise.

[rayvonnee]

My Activa 125 has developed a small issue. The Idling RPM of the engine varies and gets extremely fast when it is removed from the main stand and continues to have a higher rpm at idle continuously. Sometimes at signals the RPM Drops automatically and the scooter turns off. It does start back again without any problem, except for yesterday when it switched off automatically and refused to start up again. Since it was late night and was near to my home, I pushed and took the scooter back home and tried starting it after 15 minutes and the scooter fired up but with difficult and by using kick start. And thereafter used it for 50kms today with only the idle rpm being extremely high.
Today strangely enough I noticed that the scooter started and when left to idle on the main stand its RPM drops slowly and switches off after sometime. I took the scooter off the main stand and immediately i noticed the RPM Rising extremely high and tried to put it back on the main stand. Putting the scooter on the main stand decreases the RPM so much that it switches off and getting it down from the main stand increases the RPM so much that u need to hold the brakes to prevent it from moving ahead. Scooter is 1.4 Years Old with only 3000kms on the ODO, within warranty and regularly serviced from Honda's Authorized Service Center. However I would want to avoid the service center due to previous bad experience as they dont seem to be interested and their Chalta Hai attitude for problems. Has any one encountered or noticed such a problem on their scooters? Or Has a fix to this?

[saket77]

Originally Posted by rayvonnee

My Activa 125 has developed a small issue. The Idling RPM of the engine varies and gets extremely fast when it is removed from the main stand and continues to have a higher rpm at idle continuously. Sometimes at signals the RPM Drops automatically and the scooter turns off. It does start back again without any problem, except for yesterday when it switched off automatically and refused to start up again.

Sounds like a faulty choke cable to me. Get it changed and check. It will be cheap fix, in my opinion.

Let us know.

Regards,
Saket.

[ashwinprakas]

Originally Posted by saket77

Sounds like a faulty choke cable to me. Get it changed and check. It will be cheap fix, in my opinion.

Let us know.

Regards,
Saket.

+1 on that.

Originally Posted by rayvonnee

My Activa 125 has developed a small issue. The Idling RPM of the engine varies and gets extremely fast when it is removed from the main stand and continues to have a higher rpm at idle continuously. Sometimes at signals the RPM Drops automatically and the scooter turns off. It does start back again without any problem, except for yesterday when it switched off automatically and refused to start up again. Since it was late night and was near to my home, I pushed and took the scooter back home and tried starting it after 15 minutes and the scooter fired up but with difficult and by using kick start. And thereafter used it for 50kms today with only the idle rpm being extremely high.
Today strangely enough I noticed that the scooter started and when left to idle on the main stand its RPM drops slowly and switches off after sometime. I took the scooter off the main stand and immediately i noticed the RPM Rising extremely high and tried to put it back on the main stand. Putting the scooter on the main stand decreases the RPM so much that it switches off and getting it down from the main stand increases the RPM so much that u need to hold the brakes to prevent it from moving ahead. Scooter is 1.4 Years Old with only 3000kms on the ODO, within warranty and regularly serviced from Honda's Authorized Service Center. However I would want to avoid the service center due to previous bad experience as they dont seem to be interested and their Chalta Hai attitude for problems. Has any one encountered or noticed such a problem on their scooters? Or Has a fix to this?

Your motorcycle seems to be running crazy rich, you can confirm the same by observing your Spark Plug and Exhaust tip, your SP would appear burnt black and at high rev's your exhaust would emit black smoke, check at night with a torch.

The typical symptoms of running rich are;
1. Runs fine when cold but starts crapping out as the temperature climbs.
2. Solid low end but hits 'brick wall' earlier.

Typical causes of running rich are;
1. Clogged intake.
2. Faulty choke plunger.

This is a minor issue but if kept as such for extended periods could result in premature wear of piston rings and cylinder due to 'bore wash'.

Cheers.
A.P.

[rayvonnee]

Originally Posted by saket77

Sounds like a faulty choke cable to me. Get it changed and check. It will be cheap fix, in my opinion.

Let us know.

Regards,
Saket.

Will get it checked. Thanks

Originally Posted by ashwinprakas

+1 on that.



Your motorcycle seems to be running crazy rich, you can confirm the same by observing your Spark Plug and Exhaust tip, your SP would appear burnt black and at high rev's your exhaust would emit black smoke, check at night with a torch.

The typical symptoms of running rich are;
1. Runs fine when cold but starts crapping out as the temperature climbs.
2. Solid low end but hits 'brick wall' earlier.

Typical causes of running rich are;
1. Clogged intake.
2. Faulty choke plunger.

This is a minor issue but if kept as such for extended periods could result in premature wear of piston rings and cylinder due to 'bore wash'.

Cheers.
A.P.

As of now there is no black smoke being emitted from the exhaust.
The scooter doesn't start up easily and switches of if accelerator input is not given when cold. I have to keep giving mild throttle until it gets warm, and once warm the RPM is excessively high.

Will check the spark plug and get the choke plunger inspected. Thanks

[rayvonnee]

I took my Activa 125 to my local mechanic who immediately inspected the scooter and found the accelerator/throttle cable to be at fault. Replaced it and the issue has been solved. I dont know why but the scooter felt really smooth after this change. Thanks everyone for the help.

[Aravindpn]

Hi All,

Need your advice on the starting problem faced in my Activa 2009 model, 29k run-serviced at regular intervals.

Mornings I usually try with kicks and in 1/2 kicks it fires up. The real irritating matter is after running for say 30-40 mts in traffic of Bangalore, if I stop at a signal for 1 minute, self-start won't work. No sound and its fully dead. Then I will ahve to put it in center stand and give a kick. In one kick it fires up. Have observed that in 8/10 cases even with a stop of 30 seconds, self stops working. Unfortunately whenever I had tried to explain this to mechanics, situation is of other 2/10 cases where self fires up and I look like in front of mechanics.

Any help here is appreciated. Also any good leads for mechanics preferably in South Bangalore who 'listen' and 'understands' the issue rather than saying saar in two days it will be fine, after service it will be okay etc etc..?

Few weeks back, near BTM the scooter started losing power and stopped. Pushed to a nearby mechanic and he identified it as an air block issue and took out the fuel cap and engine oil cap and refitted them to start. Just mentioning this here, not sure of relevance but this instance and issue mentioned earlier are separate.

Thanks
Aravindpn

[FURY_44]

Originally Posted by Aravindpn

Hi All,

Need your advice on the starting problem faced in my Activa 2009 model, 29k run-serviced at regular intervals.

This is so close to what I am facing with my 2013 Dio, regularly serviced and maintained in top-notch condition except for the starting problem.

I have changed the battery, a couple of starter motors and also the bushes inside the starter motors. The bike fails to self start in the morning, all I get is a whizzzz sound. But once the vehicle is up and running after a kickstart for maybe 20kms, the self start works, but only for a couple of times and the whizzz returns.

Please help.

[ashwinprakas]

Originally Posted by FURY_44

This is so close to what I am facing with my 2013 Dio, regularly serviced and maintained in top-notch condition except for the starting problem.

Originally Posted by Aravindpn

Hi All,

Need your advice on the starting problem faced in my Activa 2009 model, 29k run-serviced at regular intervals.

Replace Starter Clutch/One Way Clutch/Bendix, not sure what its called on a scooter but get it replaced.

It is the thing that turns the engine from input from the starter motor and releases contact once the engine fires up, if its not working as intended it would slip and as a result you'd hear the motor whining freely but the engine won't be turned over.

SELF STARTER BENDIX PROBLEM OF HONDA ACTIVA & OTHER SCOOTERS.

[FURY_44]

Originally Posted by ashwinprakas

Replace Starter Clutch/One Way Clutch/Bendix, not sure what its called on a scooter but get it replaced.

Ahh the one reply I was waiting for, thanks Ashwin sir. But I forgot to mention in my earlier post, a couple of bendex has also gone by. It doesn't come cheap BTW cost me 1.5k or something.