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**neil9381** · 06-23-2014, 05:16 PM

Re: Honda Unicorn Dazzler

start your bike let the engine warm up for a few minutes then adjust the AFR screw, setting the rpm at 1200 or around that figure and see whether the problem arises
I think that the AFR screw was adjusted before when the engine was not at its optimal working temperature.

Originally posted by nsm2285 View Post

I am having a wierd problem with my 3 year old Dazzler off late. The problem is with the engine idling. When the idling is set to around 1400 rpm, whenever I accelerate and let go the throttle, the rpm goes down slower than before and sometimes the idling gets stuck at 2500 rpm for a while and then goes down to 1400 rpm. And also sometimes the rpm doesn't go down beyond 2500 rpm unless you throttle it higher for two three times. This problem goes away if I set the idling to 1200 or 1100 rpm but then it results in frequent stallings. Can anybody throw some light on what could be the problem? I just want to be aware of the root cause before taking it for service.

**nsm2285** · 06-23-2014, 05:59 PM

Re: Honda Unicorn Dazzler

Originally posted by neil9381 View Post

start your bike let the engine warm up for a few minutes then adjust the AFR screw, setting the rpm at 1200 or around that figure and see whether the problem arises
I think that the AFR screw was adjusted before when the engine was not at its optimal working temperature.

This started happening all of a sudden. AFR screw was never touched, in fact I don't even know where it is.

**devils_friend** · 06-23-2014, 06:13 PM

Re: Honda Unicorn Dazzler

Originally posted by nsm2285 View Post

I am having a wierd problem with my 3 year old Dazzler off late. The problem is with the engine idling. When the idling is set to around 1400 rpm, whenever I accelerate and let go the throttle, the rpm goes down slower than before and sometimes the idling gets stuck at 2500 rpm for a while and then goes down to 1400 rpm. And also sometimes the rpm doesn't go down beyond 2500 rpm unless you throttle it higher for two three times. This problem goes away if I set the idling to 1200 or 1100 rpm but then it results in frequent stallings. Can anybody throw some light on what could be the problem? I just want to be aware of the root cause before taking it for service.

Check Spark Plug condition, Air Filter condition. Replace them if required.

By any means, have you pressure washed your bike lately? If so, there are chances of water seeping on to the Spark Plug Cap which will affect the current frequency to the plug.

Cheerz!!

**nsm2285** · 06-23-2014, 06:18 PM

Re: Honda Unicorn Dazzler

Originally posted by devils_friend View Post

Check Spark Plug condition, Air Filter condition. Replace them if required.

By any means, have you pressure washed your bike lately? If so, there are chances of water seeping on to the Spark Plug Cap which will affect the current frequency to the plug.

Cheerz!!

Thanks, will check that. My bike is hardly used though, just 4500kms on odo. Yes, pressure wash was done around 20 days ago.

**ravi@17bhp** · 06-23-2014, 06:24 PM

Re: Honda Unicorn Dazzler

Originally posted by nsm2285 View Post

I am having a wierd problem with my 3 year old Dazzler off late. The problem is with the engine idling. When the idling is set to around 1400 rpm, whenever I accelerate and let go the throttle, the rpm goes down slower than before and sometimes the idling gets stuck at 2500 rpm for a while and then goes down to 1400 rpm. And also sometimes the rpm doesn't go down beyond 2500 rpm unless you throttle it higher for two three times. This problem goes away if I set the idling to 1200 or 1100 rpm but then it results in frequent stallings. Can anybody throw some light on what could be the problem? I just want to be aware of the root cause before taking it for service.

First check if the accelerator cable is sticking somewhere. Replace it if its too old. Second, check if there is any vacuum leak in carb. Tune the carb properly.

Sent from my GT-I9000 using xBhp Connect mobile app

**SparKot** · 06-23-2014, 07:42 PM

Re: Honda Unicorn Dazzler

Originally posted by nsm2285 View Post

I am having a wierd problem with my 3 year old Dazzler off late. The problem is with the engine idling. When the idling is set to around 1400 rpm, whenever I accelerate and let go the throttle, the rpm goes down slower than before and sometimes the idling gets stuck at 2500 rpm for a while and then goes down to 1400 rpm. And also sometimes the rpm doesn't go down beyond 2500 rpm unless you throttle it higher for two three times. This problem goes away if I set the idling to 1200 or 1100 rpm but then it results in frequent stallings. Can anybody throw some light on what could be the problem? I just want to be aware of the root cause before taking it for service.

To sum up what everybody said:

Carburetor (most likely candidate):
1. Carburetor cleaning : Jet's air, fuel & air-fuel mixture passages (inlets/outlets)
2. Carburetor mounting clamps for Vacuum leaks

Spark Plug:
Service age, condition & need for replacement.

TPS:
Check TPS readings are within recommended range between 0-throttle & full-throttle.

Throttle Cable:
Free movement/return of throttle cable @carburetor end.

Air Filter:
Service age, condition & need for replacement.

**BhanuPrakash** · 06-26-2014, 01:03 PM

Re: Honda Unicorn Dazzler

Hey guys,
Any good mechanic or service center for Honda Dazzler servicing in Bangalore?
I am really fed up with the Silicon Honda service.

**SparKot** · 06-26-2014, 01:31 PM

Re: Honda Unicorn Dazzler

Originally posted by BhanuPrakash View Post

...
Any good mechanic or service center for Honda Dazzler servicing in Bangalore?
I am really fed up with the Silicon Honda service.

Check : [MENTION=51754]theironhorse99[/MENTION] managed to stay in service-center during servicing.
Honda CBR 250R - Page 1447

Try that couple of times & see if it makes any difference in service provided.

**sibun** · 06-26-2014, 11:15 PM

Re: Honda Unicorn Dazzler

Originally posted by nsm2285 View Post

I am having a wierd problem with my 3 year old Dazzler off late. The problem is with the engine idling. When the idling is set to around 1400 rpm, whenever I accelerate and let go the throttle, the rpm goes down slower than before and sometimes the idling gets stuck at 2500 rpm for a while and then goes down to 1400 rpm. And also sometimes the rpm doesn't go down beyond 2500 rpm unless you throttle it higher for two three times. This problem goes away if I set the idling to 1200 or 1100 rpm but then it results in frequent stallings. Can anybody throw some light on what could be the problem? I just want to be aware of the root cause before taking it for service.

Its the choke cable that is playing havoc. Just change the choke cable and also open the choke piston and if rusted change it. Change the cable and choke piston as a set and your problem will go. The problem what you have mentioned is know as dieseling. Due to excess fuel due to choke remaining open the engine runs like diesel engine firing due to heat. Just change the choke cable and choke piston set. All your problem will vanish and engine will idle at 1000 rpm beautifully.

**nsm2285** · 06-30-2014, 05:57 PM

Re: Honda Unicorn Dazzler

You were spot on Sibun! It was indeed the choke thingy playing here. The mechanic immediately told me its the choke after inspecting my vehicle. He also said tappet adjustment needs to be done too as it was having a slight khad-khad sound when the engine becomes hot. Both issues fixed and bike is as smooth as butter now.

**SparKot** · 06-30-2014, 07:19 PM

Re: Honda Unicorn Dazzler

Originally posted by sibun View Post

Its the choke cable that is playing havoc....
The problem what you have mentioned is know as dieseling. Due to excess fuel due to choke remaining open the engine runs like diesel engine firing due to heat...

Nice catch there sibun

Any suggestion to prevent 'dieseling' phenomenon?
Does daily usage of choke for morning startups keep choke's piston/cable in right condition?

SVC mechanic once said to me to not stop using choke(use when necessary without fail), otherwise it may render useless eventually.

**sibun** · 06-30-2014, 10:42 PM

Re: Honda Unicorn Dazzler

Originally posted by nsm2285 View Post

You were spot on Sibun! It was indeed the choke thingy playing here. The mechanic immediately told me its the choke after inspecting my vehicle. He also said tappet adjustment needs to be done too as it was having a slight khad-khad sound when the engine becomes hot. Both issues fixed and bike is as smooth as butter now.

I knew that i was more than 100% right. Because when i give a solution to a problem i do a lot of calculations and test the different things that can cause the problem. After eliminating all the possibilties one by one i give the last thing that comes out and it would be the exact cause. I was just waiting for your reply if your problem was solved or not.

Originally posted by SparKot View Post

Nice catch there sibun

Any suggestion to prevent 'dieseling' phenomenon?
Does daily usage of choke for morning startups keep choke's piston/cable in right condition?

SVC mechanic once said to me to not stop using choke(use when necessary without fail), otherwise it may render useless eventually.

Dieseling phenomenon is caused when the engine is flooded with excess fuel. It is then that the fuel ignites by heat and engine compression and thus engine revs do not come down even when throttle is closed.

Daily use of choke keeps the cable and piston alright but it will eventually fail. the reason for this is that modern day bikes come with choke mostly in left switch console or near the handle bar. So when we wash the bike or ride in rain this will eventually start dripping water through the cable over time. This causes the cable and choke piston to rust with time. Nothing can be done except changing the cable after two monsoons.

**neil9381** · 06-30-2014, 11:07 PM

Re: Honda Unicorn Dazzler

[MENTION=28527]sibun[/MENTION]
your replies help us learn more

**kusmaker** · 06-30-2014, 11:10 PM

Re: Honda Unicorn Dazzler

Dieseling or engine run-on mostly happens on carburetted engines, a hot spot inside the cylinder will starts combustion, most of the advance vehicles are fitted with Fi and ecu monitoring system, the injectors and high bar fuel pump terminates the supply to the engine as soon as the ignition is switched off,dieseling can even occur in diesel engines.

**sibun** · 07-01-2014, 08:49 AM

Re: Honda Unicorn Dazzler

Originally posted by kusmaker View Post

Dieseling or engine run-on mostly happens on carburetted engines, a hot spot inside the cylinder will starts combustion, most of the advance vehicles are fitted with Fi and ecu monitoring system, the injectors and high bar fuel pump terminates the supply to the engine as soon as the ignition is switched off,dieseling can even occur in diesel engines.

Yes you are right as in carburettor engines only it happens. It happens only when excess fuel is entering the combustion chamber and engine is hot. Fi will never have dieseling for the simple reason that they do not flood the engine with excess fuel.

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