Spark Plugs

[dumb0]

Re: Spark Plugs

[MENTION=32286]psr[/MENTION] sir,

Please assess my plug CR6HGP which has run 100km after change in HH Splendor+.

[psr]

Re: Spark Plugs

@psr sir,

Please assess my plug CR6HGP which has run 100km after change in HH Splendor+.

Though the heat range of the plug is as recommended, the plug does look as if it is running hot.The ground electrode looks as if it is running red hot till it's welding point to plug's body.. this means the plug is running very hot. Lean AFR may be one reason. the other is this plug you are using is a projected nose which slightly increases compression and hence runs hot. Try a non projected plug or try to enrich the present AFR.
Here is a picture to explain on how to read a plug..

[dumb0]

Re: Spark Plugs

Though the heat range of the plug is as recommended, the plug does look as if it is running hot.The ground electrode looks as if it is running red hot till it's welding point to plug's body.. this means the plug is running very hot. Lean AFR may be one reason. the other is this plug you are using is a projected nose which slightly increases compression and hence runs hot. Try a non projected plug or try to enrich the present AFR.
Here is a picture to explain on how to read a plug..

[ATTACH]246161[/ATTACH]

Thank you, Sir & wish you a Merry Christmas !

This NGK G power Platinum electrode plug when compared to a normal plug does look like one having a projected nose, but it is a normal one.

Prior to this, the engine was smoking so much that it consumed 500 ml every 2000 km travelled. It made normal plug fouled every 50 km with thick crust of carbon.

To use the engine the plug was changed to Mico U4A, which kept working with thick crusty carbon deposits on the flat surface of plug.

Though it was returning 54 kmpl, only the rings were changed with a 0.25 size ring on a standard size piston after slight grinding of new rings on a 320 number sandpaper (as described by [MENTION=28527]sibun[/MENTION] sir in Splendor thread).

Now, the Compression is so good that the bike does a wheelie with a slight twist of accelerator.

[#bpk]

Re: Spark Plugs

Hi everyone, my 2600 kilometers run jupiter shuts down in morning, if i open throttle slightly after descending from a speedbreaker, i warm up 10 minutes every morning, svc set the idle and afr to recommended specifications. After the morning ride, when the scooter warms up nicely there's no such problems. I've attached a picture of my plug,kindly tell me if the plug is ok. [MENTION=32286]psr[/MENTION] sir, please help, i am very much worried [emoji22]

[#bpk]

Re: Spark Plugs

Hi everyone, my 2600 kilometers run jupiter shuts down in morning, if i open throttle slightly after descending from a speedbreaker, i warm up 10 minutes every morning, svc set the idle and afr to recommended specifications. After the morning ride, when the scooter warms up nicely there's no such problems. I've attached a picture of my plug,kindly tell me if the plug is ok. [MENTION=32286]psr[/MENTION] sir, please help, i am very much worried [emoji22]

Spark plug picture.

[B7ACKTHORN]

Re: Spark Plugs

Spark plug picture.

The spark plug looks okay, not too rich nor too lean, the tip has no chunky deposits and or flakes which is a good sign. This shouldn't be cause of concern to be worried. Sometimes the carb bowl gets overloaded and bog the vehicle during deceleration. Adjust your idling RPM a wee bit higher, and see if it helps. Was this issue reported after the SVC fiddled your idle RPM and AFR mixture?

Cheers!
VJ

[#bpk]

Re: Spark Plugs

The spark plug looks okay, not too rich nor too lean, the tip has no chunky deposits and or flakes which is a good sign. This shouldn't be cause of concern to be worried. Sometimes the carb bowl gets overloaded and bog the vehicle during deceleration. Adjust your idling RPM a wee bit higher, and see if it helps. Was this issue reported after the SVC fiddled your idle RPM and AFR mixture?

Cheers!
VJ

Yes, the svc did that, also i increased idle a bit by myself, the problem of shutting down, vanishes after riding about 1 kilometer.

[kiran2508]

Re: Spark Plugs

Hi everyone, my 2600 kilometers run jupiter shuts down in morning, if i open throttle slightly after descending from a speedbreaker, i warm up 10 minutes every morning, svc set the idle and afr to recommended specifications.[emoji22]

I am fellow owner of Jupiter 2016 with around 16-18K kms, yes I have faced this issue on cold starts, one increase of throttle of blips, it just chokes and engine just cuts dies and cuts off and sometimes also face the ADHD (Acceleration Deficient Hiccup Disorder).

I did a bit of digging around with starting with the usual suspects same like you, AFR, Carb, Spark plug, even poking around if it had any piston/cylinder issue etc etc.
In the end it turned out to be a bad fuel and nothing to do with any mechanical components, either mixed with water due to extra bit of moisture content in fuel winter days (also water at bottom from fuel pump storage tanks) and/or kerosene. Kindly check back once after change of fuel pump and vendor(BP to HP to IOCL)

Also, there is a design flaw in Jupiter fuel tank, any dust gung in fuel gets directly in the way of fuel outlet and blocks it partially, so not delivering full 100% fuel out. Check for the same.

[#bpk]

Re: Spark Plugs

I am fellow owner of Jupiter 2016 with around 16-18K kms, yes I have faced this issue on cold starts, one increase of throttle of blips, it just chokes and engine just cuts dies and cuts off and sometimes also face the ADHD (Acceleration Deficient Hiccup Disorder).

I did a bit of digging around with starting with the usual suspects same like you, AFR, Carb, Spark plug, even poking around if it had any piston/cylinder issue etc etc.
In the end it turned out to be a bad fuel and nothing to do with any mechanical components, either mixed with water due to extra bit of moisture content in fuel winter days (also water at bottom from fuel pump storage tanks) and/or kerosene. Kindly check back once after change of fuel pump and vendor(BP to HP to IOCL)

Also, there is a design flaw in Jupiter fuel tank, any dust gung in fuel gets directly in the way of fuel outlet and blocks it partially, so not delivering full 100% fuel out. Check for the same.

Thanks, i will change the fuel station and see.

[psr]

Re: Spark Plugs

Most modern 2 wheelers and 4 wheelers are fuel efficient and so inherently run lean. Unless engine comes up to operational temperature, it will run bad with seemingly poor power. For this reason MPFi engines run at higher RPM at start and settle down to normal RPM once engine obtains operational temperature.
In a Carburetor vehicle this is not provided and hence the problem under cold condition.
So this is normal to have start and run problem in Carburetor vehicles till engine comes up to operational temperature.
Alternatively like other members have suggested, it can also be due to bad petrol. Do not park your vehicle without use for more than 15 days, and /or use petrol in the Petrol Tank if it is more than 45 days old, since the chemical property changes .
Good Luck.

[#bpk]

Re: Spark Plugs

Most modern 2 wheelers and 4 wheelers are fuel efficient and so inherently run lean. Unless engine comes up to operational temperature, it will run bad with seemingly poor power. For this reason MPFi engines run at higher RPM at start and settle down to normal RPM once engine obtains operational temperature.
In a Carburetor vehicle this is not provided and hence the problem under cold condition.
So this is normal to have start and run problem in Carburetor vehicles till engine comes up to operational temperature.
Alternatively like other members have suggested, it can also be due to bad petrol. Do not park your vehicle without use for more than 15 days, and /or use petrol in the Petrol Tank if it is more than 45 days old, since the chemical property changes .
Good Luck.

Thanks sir.

[vvk1999]

Re: Can i use Iridium Spark Plugs with regular ones?

Hi all,

I have a pulsar 200AS from June 2015 which has done around 8800Km. Its running on stock champion spark plugs.
The spark plugs have to be changed now. The bike needs three plugs. I was thinking of getting the NGK ones.

The iridium ones are:
Centre plug: LKAR8AI-9 ~Rs.250
2 Side Plugs: CPR8EAIX ~Rs.650 each
The total cost comes to around Rs.1500 which i think is too much.

The regular ones are
Centre plug: LKAR8A-9 not available
2 Side Plugs: CPR8EA-9 ~Rs.100 each

The centre one is not available anywhere!

So my question is, can i use the iridium one as centre plug and the regular ones as the side plugs? Would that mess with the ignition or does it not matter and can combine regular and iridium ones?

i am using iridium for center & stock for L-R .
cold start is excellent now . bike idle at 1k rpm easily . i have a 2014 ns200

[dumb0]

Re: Spark Plugs

Most modern 2 wheelers and 4 wheelers are fuel efficient and so inherently run lean. Unless engine comes up to operational temperature, it will run bad with seemingly poor power. For this reason MPFi engines run at higher RPM at start and settle down to normal RPM once engine obtains operational temperature.
In a Carburetor vehicle this is not provided and hence the problem under cold condition.
So this is normal to have start and run problem in Carburetor vehicles till engine comes up to operational temperature.
Alternatively like other members have suggested, it can also be due to bad petrol. Do not park your vehicle without use for more than 15 days, and /or use petrol in the Petrol Tank if it is more than 45 days old, since the chemical property changes .
Good Luck.

Sir,

Please clarify :

Would it be useful/ advisable to add Iftex System G (Adon-P) to Petrol for Optimum Performance of older fuel in the Petrol Tank ?

regards

[B7ACKTHORN]

Re: Spark Plugs

Sir,

Please clarify :

Would it be useful/ advisable to add Iftex System G (Adon-P) to Petrol for Optimum Performance of older fuel in the Petrol Tank ?

regards

Adding to what psr sir said, you can use IFTEX System G and/or fuel injector system cleaners. These have some effect, but don't expect miracles. They help clean the injector and the combustion chamber on the go by burning the carbon deposits. These don't have any affect on the fuel in the tank, unless the fuel is extremely old once you get a foul smell from the tank rather than the distinct fuel smell associated with normal petrol, then it's time to replace the fuel itself. It's the best thing to do. Remember, over time fuel can in fact rust your tank, no matter the amount of additives you add.

Though there are fuel tank additives for storage, I'm afraid if they are available in India. Better to ditch the old fuel and fill in fresh fuel.

Cheers!
VJ

[psr]

Re: Spark Plugs

Sir,

Please clarify :

Would it be useful/ advisable to add Iftex System G (Adon-P) to Petrol for Optimum Performance of older fuel in the Petrol Tank ?

regards

Fuel additives help in keeping the system clean and help to have cleaner combustion...It cannot help if there is old fuel in the tank. Petroll is a chemical which deteriorates over time and so becomes unsuable after sometime . If one use an engine with old petrol, a gum like Varnish deposit will take place through all it's path ..