Honda_CBF

My bike's again giving me silly headache!!
Now I'm dealing with missing kind of issue whenever riding below 3k rpm, it feels like hitting reserve..
I got the carb & tank cleaned but no help.
Local mechanics and SVC people are unable to troubleshoot this problem.
Also, if i ride with 1/3rd chock ON everything gets fine.
Plz suggest me..

Noor

Query approved

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prajnyan

You are telling that when you pull the choke the bike runs fine.

The choke acts to enrich the fuel+air mixture in Carburetor with more air letting the engine warm up to cold start with higher burning temp when there is more oxygen.

So the solution for your problem is to get the SVC checked for the carb settings, to let in a little more air, or lesser fuel.
It can also be due to inferior quality fuel. Try making sure its not the adulterated fuel before proceeding to following steps.

How many km have you covered so far? Becoz if the carb. setting did not help much the only other culprits for your bikes behavior can be carbon deposit on spark plug or them not getting enough voltage to burn the mixture (sometimes old spark plug or poor battery voltage generated (Does the bike get self started? If yes, you can ignore battery not generating enough voltage issue here) can result in not enough to get a proper spark, and whatever spark is generated could be very less so it can only ignite when there is more air easily or it feels like engine is getting killed.)
Try using a G-power NGK spark plug instead of the regular, as a shot and also check the wiring connecting the spark plug to the battery including the CDI.

If the problem doesnt get fixed after resetting carb, or changing spark plugs and petrol try going in for warranty claim and get the carb or the CDI replaced. Its either one of them that is the culprit. Dont let the time pass by or you will end up without warranty and spending lot of money on a new one.


Remember:Running the bike continuously with choke pulled will spoil choke mechanism and deposit carbon on the spark plugs, not to mention overheat the engine and drop in mileage.

Honda_CBF

thanks for your approval noor

My bike is 18k and 1.5 yrs old, so its out of warrenty.
carb setting, spark plug, fuel quality, air filter, battery are all fine.
but I'm not sure about the voltage & CDI.. can you tell me how to check it?
btw, I guess they are fine too, because bike runs perfect from 4k rpm to near redline!!
And I dont think G-Power spark plugs are avilable at my place.
And also I dont use choke all the time.. I use it only when I've to get started from standstill.

prajnyan

That's good to know that your bike has done pretty much about 2k km every month or so only and most of the problem points are covered.. Its alright dont buy a new one, go to the SVC ask the mechanic to swap the spark plug from some other new bike to test to check if it stalls. If it doesn't then you can buy the new spark plug recommended for the bike.

If that does not help, then the CDI may be a culprit. A CDI or the capacitive-discharge ignition uses capacitor discharge current output to fire the spark plugs. Its an electronic component (something like ballast for your tubelights) You need to change the unit and check, its just a plug in kind of thing.

Honda_CBF

I swaped the spark plug with a new one.. No help. Will try swapping the CDI unit.
And my bike doesn't stall, it just feels like its going to stall..
Its like a turbo lag..
I open the throttle some 2-5mm & bike stars slowing down (rpm drops, slowly) then suddenly surge of acceleration & power delivery..
This doesn't happen if I'm using more throttle.

Shreeni0403

This is not the CDI issue. Get the air fuel ratio a bit more rich. If this doesn't work, get the pilot jet checked, if its clogged. Did you personally see the SVC guys cleaning carb completely? 99% they don't do it !!

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Honda_CBF

err.. I myself cleaned the carb. Its clean.

RedFlash

Try cleaning/changing the jet.

Use copper wire to clean the jet.

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Aneesh@4GHz

I think the afr is very lean,Please a post a pic of the plug tip.If its lean,please make the afr richer by 0.5 turns or half turn and check and revert.

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