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**Brezon95** · 01-26-2016, 08:04 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Also the bike would start in morning but when throttle is raised engine starts stalling. I have to warm up the bike 10 mins before moving.
When the bike is standing for 2-3 hours and then when I start it, I face the same issue. Engine would start but it does not respond to throttle. When throttle is raised, engine just tends to die.
Could this be because of fouled spark plug?

**RohIIT** · 01-27-2016, 12:13 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by Brezon95 View Post

Also the bike would start in morning but when throttle is raised engine starts stalling. I have to warm up the bike 10 mins before moving.
When the bike is standing for 2-3 hours and then when I start it, I face the same issue. Engine would start but it does not respond to throttle. When throttle is raised, engine just tends to die.
Could this be because of fouled spark plug?

Post a pic of spark plug , it tells a lot about health of the bike. looks like you are running excessively rich (wrong AFR , blocked off air filter ) which is fouling plug and causing cold start issues.

**dude_creative** · 01-27-2016, 12:54 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by RohIIT View Post

Post a pic of spark plug , it tells a lot about health of the bike. looks like you are running excessively rich (wrong AFR , blocked off air filter ) which is fouling plug and causing cold start issues.

He already posted 1 page back, it definitely runs rich. either water entered air filter or carb is messed, dont know.

**RohIIT** · 01-27-2016, 01:02 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by dude_creative View Post

He already posted 1 page back, it definitely runs rich. either water entered air filter or carb is messed, dont know.

Might have missed the image , saw now and his replies tell definite story of uber rich running. Either AFR is haywire or as pinaki ji pointed out spark strength is lowered due to normal wear and tear.

**Brezon95** · 01-27-2016, 04:45 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Yes I think its all because of faulty plug. I will get it replaced and tune carb to a bit lean mix.

**jeswin** · 01-27-2016, 09:37 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by Brezon95 View Post

Yes I think its all because of faulty plug. I will get it replaced and tune carb to a bit lean mix.

Ya, replace the plug with champion one as Pinaki sir said. You'll feel the difference. My bike has been running on that plug for 30,000 kms.

**sibun** · 01-27-2016, 10:25 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by Brezon95 View Post

This is how my spark plug looks-

[ATTACH=CONFIG]202653[/ATTACH]

[ATTACH=CONFIG]202654[/ATTACH]

[ATTACH=CONFIG]202655[/ATTACH]

Is this sorted? Also I can smell petrol from it.

The spark plug is sorted. This is due to excess fuel mixture going into the cylinder.

Change the spark plug to Bosch UR4A. It is coming in OE packing or you can get original bosch from spares shop. But remember get original Bosch as there are too many fakes in market. And remember there is no MICO now. It is now fully owned by Bosch now. The plug will have blue lines on white ceramic portion.

Why Bosch?

1. They are less susceptible to getting sort in unhealthy condition.

2. They give thicker spark than NGK.

3. I feel they have better performance than NGK lately as i don't find NGK to be same as before. Presently running on Bosch UR4A on Joy and Bosch UR5DC that hero is now giving as OE. On extreme i found the bike getting smoother and maintaining high speed is much easier. Also the engine sounds more smoother than NGK. On joy well it is running like the day it was fitted and the plug is super clean with nil carbon deposits.

Since its fifth service get the air filter changed. Change the plug and Set the air screw to 1.5 turns out from full tight position.

**Brezon95** · 01-27-2016, 10:36 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Thanks dude creative, sibun, jeswin, pinaki and rohit for your help

I will definitely change the plug and post the results after getting it changed and carb tuned.
I really appreciate your help thank you so much

**Brezon95** · 01-28-2016, 07:14 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

3200 KMS done today.

**pranab** · 01-28-2016, 10:23 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by sibun View Post

As for spark plug, i am not saying of spark.

You want to know what a spark tell. A spark can tell a lot about bike. Most here knows what is written in books, but i will tell the practical noise.

Want to test your bike spark.

This is particularly of Hero Honda with AC ignition:-

Open the spark plug cap. Keep the spark plug fitted in head. Show the bare terminal near spark plug tip which connects to plug cap. Keep a distance of 0.5 cm. Hold the wire with insulated pliers. Take care. Start the engine and see spark jumping from wire end to plug.

1. The spark is reddish and the spark intensity is thin- Then the ignition coil has gone weak.

2. The spark is stronger at high revs and goes weak at idling- Charging coil gone.

3. Spark is short and thick with deep blue. On increasing distance the spark looses- Charging coil gone.

4. Spark is blue but thin and longer - Pulsar coil gone, If you remember M80, a bike from bajaj, then if its pulsar coil is gone then the spark can jump almost 4-5 inches.

Change both ignition coil and charging coil together as a set. As for pulsar coil, Hero Honda pulsar coil doesn't fail easily.

And that bold and underline part, time is not right. People will think something other. So dhondu beta just chillllllll

Sorry for late replies. Actually I live in an apartment and doing some mechanic stuff at the parking area is kinda awkward because every ongoing person looks at me as if I have done some crime lolzzz . These people dosnt even clean their spark plug by themselves. They religiously go to the mechanic to get their brake tightened. SO I cant do any mechanical stuff at the parking of my apartment. I have to always contact one of my friend and if he is available on sunday then I do some stuff at his place. So I have to wait for the sundays to do all the DIY.
Sibun Sir ....... I inspected the spark (holding the ignition wire close to spark plug) and it appears to be Bluish in color.
It does not get thinner or thicker when on idle or reved hard. Its thickness remains the same.
The spark breaks if i increase the distance more then 2 inches. It does not keep upto 4-5 inches.
And the spark does not appear deep blue.

I dont have same level of expertise or experience so there is a possibility that I am not able to read the spark as you would do.
I have opened the Ignition Coil and checked its resistance and it reads 7.39 KOhms. My OE Plug caps reading is below 5 Kohms.
Sibun Sir kindly let me know what is the reading of your Ignition Coil. That way it will be clear if the Ignition Coil is weak or the magnet coil needs replacement. According to some articles that i read on internet the Ignition Coil which reads below 10 Kohms is not a bad coil. Sibun sir kindly give me some base line specification so that we can narrow down to part which is bad.

Lately one fine day..... I got very bad mileage while visiting an Architect 30Kms from my place. Came back and the very next morning checked the Air screw and I was surprised to see that it is almost screwed in (running super rich). But previously I kept it on leaner setting to minimize the carbon deposit but how does it gone to richer side. Sibun sir is there a possibility that the screw or the spring is bad and the bikes vibration is causing the Air screw settings change.
In the mean time I have visited multiple SVC twice and asked them for Air screw O-Ring but they replied we dont have it because nobody comes to buy these small stuff. So after some buttering and requesting one SVC guy made some phone calls and then gave me the confirmation to collect it after few days as they have it in their godown.
Without the O-Ring i havnt opened the carburetor yet. Will clean the carburetor as soon as I get the O-Ring. Till than kindly guide me with the inspection of the Ignition Coil and the Magnet Coil. Can we examine the magnet coil also ????? Changing parts without thoroughly inspecting it is not a good idea i think because that is what the mechanics do, keep changing parts with the customers money untill the problem gets solved.
Sibun sir , Pinaki Sir, Dude creative, Jeswin , Shoeb and to all the senior members thanks a lot to you guys who are helping so many people.

Sibun sir the bold part is just the gratitude and respect from my side so guys please dont think the other way its just Bhai Bhai thing nothing else.
Forgot to tell you Sibun Sir, around 5 years back i use to work at Bhubaneswar (CRP Square, Nayapalli, Near passport office). And I have visited Puri also, Lovely place with lots of greenery.

**jeswin** · 01-28-2016, 10:47 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by Brezon95 View Post

3200 KMS done today.

Keep on riding. As the engine gets older, it becomes much smoother and you'll like your bike even more

**Brezon95** · 01-28-2016, 11:08 PM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by pranab View Post

Sorry for late replies. Actually I live in an apartment and doing some mechanic stuff at the parking area is kinda awkward because every ongoing person looks at me as if I have done some crime lolzzz . These people dosnt even clean their spark plug by themselves. They religiously go to the mechanic to get their brake tightened. SO I cant do any mechanical stuff at the parking of my apartment.

Sorry for offtopic. I am in the same situation as you. I also live in an apartment and whenever I am doing something on the bike everyone looks like I am doing a crime, its so awkward. Once when I was tuning the carb and bike was idling at high rpm, everyone looked at me as if I am messing/have messed something in the bike. On top of that I had a screwdriver in my hand. Even two uncles came to me and asked me whats wrong.

These people dont know about their machines well. Many are not even bothered to read the owner's manual.

**Pinaki** · 01-29-2016, 12:00 AM

Re: Hero Moto Splendor/Joy/CD-Dawn/Passion

Originally posted by pranab View Post

I have opened the Ignition Coil and checked its resistance and it reads 7.39 KOhms. My OE Plug caps reading is below 5 Kohms.

I measured the resistance when I bought a new one and it was around 4kΩ , so thats fine . Remember that the spark plug itself has build-in resistor of 4kΩ making it a total of around 8kΩ inline on the ignition line - just to suppress radio interference .
I think you cannot determine ignition coil fitness with simple metering because it's showing okay at the small test voltages of the meter , may or may not breakdown at their operational voltages which exceeds 20 kilovolts . Same with ignition cable , it's insulation and the spark plug too .

Originally posted by pranab View Post

In the mean time I have visited multiple SVC twice and asked them for Air screw O-Ring but they replied we dont have it because nobody comes to buy these small stuff.

Same problem here also brother , parts distributor is reluctant to sell things like o-rings and speedo cable inners only as spares . However the whole air screw assembly ( brass air-screw + spring + oring ) is available packet costing Rs 65.00 , so you can just buy that too . That screw is under heavy spring tension and should not move at all under any vibration , so check carefully what's wrong when you have it opened .