Replace spark plug with NGK CR7HSA and the plug cap with OE one (of the same type that came with your bike) .
After this check all the regular service items with your bike is okay - like oil level , carburetor clean & tuned correctly , airfilter foams intact, cleaned & oiled , ignition coil & wiring in good condition etc etc . Considering the high mileage of your bike it deserves a good checkup .
I don't get what your mechanic means by that , because oil is supposed to reach engine head for normal operation .

Pinakiji,
I think mechanic is referring to oil reaching piston top into the combustion chamber, due to worn rings/cylinder.
But I don't understand how he confirms that by just opening the spark plug cap.

I think mechanic is referring to oil reaching piston top into the combustion chamber, due to worn rings/cylinder.

Replace spark plug with NGK CR7HSA and the plug cap with OE one (of the same type that came with your bike) .
.

It may also due to worn out valve stem oil seals. If piston rings are gone then bike will be smoking on running. Correct me if i am wrong

Correctly pointed out . I think he must have removed spark plug and saw oil deposits on it.

Anyways i have same gen bike and mine is burning oil in just 50k kms , so you are lucky to get high mileage out of it.

I would say wait for @sibun to reply on getting a new bore or using existing one.

You might need to spend 2.5K max but it will give you brand new half engine .

....

SatSon Sir ............... Kindly let us know how much possibility is there for the oil to reach the cylinder from bad piston Rings. I have done a complete engine overhaul but it didnt helped me a bit. The problem was evident on the 2nd day itself. (Changed rocker arm, Valves, Ring piston set). Kindly put some light in this regard because though what I have done in my bike, has minimized the problem but it is not completely gone. Do you think that the Air Suction Valve can be the culprit. Does it have a possibility to get clogged with time and let the cylinder make extra compression/vacuum and then the oil gets into the cylinder due to the extra pressure. Just thinking about all the possibilities.

...

SatSon Sir ............... Kindly let us know how much possibility is there for the oil to reach the cylinder from bad piston Rings. I have done a complete engine overhaul but it didnt helped me a bit. The problem was evident on the 2nd day itself. (Changed rocker arm, Valves, Ring piston set). Kindly put some light in this regard because though what I have done in my bike, has minimized the problem but it is not completely gone. Do you think that the Air Suction Valve can be the culprit. Does it have a possibility to get clogged with time and let the cylinder make extra compression/vacuum and then the oil gets into the cylinder due to the extra pressure. Just thinking about all the possibilities.

Did you check carburetor first... Sounds like it runs too rich and also might be clogged air filter that needs replacement.
Not only engine oil can foul the plugs.. rich fuel mixture also can.

No need to call me Sir
You have already learned and experimented a lot. Keep up the spirit.
I believe your mechanic didn't do his work properly. We shall wait for the expert - Sibun to pitch in

First of all very very happy new year wishes to all the xbhpians and senior members from Pranab Pandey from Jabalpur (M.P.)
I have been going through some major problems with my bike and for the purpose of solving those problems I have been reading hundreds of posts of senior members of xbhp. This particular thread has helped me a lot to rectify those problems. My Hero Honda Passion+ is more than 10 years old and was bought in 2004. I use to hate this bike too much at the beginning and use to abuse it quite a lot but with time it has gained a lot of respect and at this point when it started giving all sorts of problem I am not willing to sell this bike at any cost and determined to solve the issues myself because my mechanic failed to rectify problems.
For the past almost 9 years it didnt gave any trouble.. But for the past one year upon starting the bike at morning engine oil use to come on the spark plug and I was only left with the option to open the spark plug and clean it and start the bike again. I got fed up and took the bike to my mechanic and even showed it to Hero honda service centre also and they suggested both suggested me for piston change because it was more than 10 years and has clocked 1Lakh plus Kms but I was surprised that the bike wasnt giving white smoke. But still I thought that everyday oil was coming on the spark plug so I thought that the piston rings must have gone bad. So finally I did the engine rebore from my mechanic. Changed both valves ,timing chain, rocker arms and rebored with usha ring piston set (.25). I thought that the oil coming on the spark plug problem has solved but to my surprise on the very 2nd day i experienced same problem and had to again open the spsrk plug and saw oil in it. So I realized that the problem was not the bad piston rings, thats why there wasnt any white some from my bike. ....... Upon realizing this I thought to figure out the problem my self. I started tinkering few things on my bike and started reading threads and visiting forums. I have registered to Xbhp just to share my experience so that it may help someone in future. The steps i took for the engine oil coming to the spark plug problem.

1. I cleaned the air filter thinking that it may have been clogged and wasnt letting enough air flow to the carburetor.

2. I checked the engine oil level and found out that it was over filled. Searched for the owner's manual which I have kept with me for the past 10 years and found in it that the recommended quantity is 750ml. I think my mechanic has filled 1L oil during the servicing.

3. I tried to reduce the petrol supply from carburetor because black carbon / black oily stuff was accumulating on the spark plug. but even with reduced petrol supply carbon was still accumulating. So I opened up the petrol supply/pilot screw and found there was black sooty stuff on its lower 1/3rd part. So I cleaned it with petrol and screwed it back. It actually worked . The black soot wasnt allowing the screw to close the petrol supply properly.

4. I read on this thread and started to hunt for a non resistor type plug. Because I was going through oily plug condition I thought it would help if I can get a non resistor plug because it would give a hotter spark and better/complete combustion and will help the oil (which was coming on spark plug) to burn off during combustion. To my surprise the spare parts shop dosnt have any idea about resistor or non resistor spark plug. All I could find was the Champion PR7Z somethin somethin which I am already using and is a resistor spark plug.

5. Upon failing to get a non resistor plug I started googling about how the spark plug is actually made and if there is any possibility I can get rid of the RESISTOR. Upon reading some articles I found out that there is a possibility. I took my Champion spark plug and took off the resistor and the plug is now giving Bluish white spark as compared to earlier when it use to give red or orangish spark. I think it is giving a getter and hotter spark.

6. Then I retuned the carburetor on a leaner setting (not very lean) and now after 5 or 6 days of riding, took off the spark plug and it was clean and there wasnt any carbon deposit on it................................ I am the happiest guy on earth heheeee

Note: I have been facing this problem from last 1 year and was avoiding the engine rebore but got fed up with the oily spark plug problem and did the rebore couple of days back in December 2015 but the problem didnt go. Then upon doing some small tits and bits by myself the bike has again came to its full glory.

Now only a little tik tik tik tik sound coming from head side of the engine. I think its the more than recommended loose tappet gap . My mechanic has a history of doing more than recommended things as we all know lolzz..... Senior members kindly give your opinion on this.

Regards
Pranab

Hi All,

I have serious problem in my bike, need your help and suggestions. Please help.....

Let me start explaining what happened from yesterday. I started back home from my office and on one kick bike started and was able to go for around 50ft and stopped all of sudden. Tried starting by multiple kicks and also tried other option by push start but ended with no luck. Took to mechanic near by and surprisingly me started in sec by just removing the spark plug cap and hold directly at plug. Next on, bike was smooth and started with out any issue was back home.


To reached office without any start issue. Now when was starting back home again same issue. On one kick bike started and was able to go for around 50ft and stopped. Tried starting but again ended with no luck. Took to same mechanic and he did the same and started the bike.

Now when I ask what's the issue? Why I'm facing this problem? his reply "oil is reaching piston head, hence this issue. To rectify need to remove engine and fix it. Cost goes around 1800/-. Can be fixed and done by 6hours".

Could you suggest me, what I need to do now? I'm puzzled and more varied of bike.

Bike: Splendor (2002)
Odometer Reading: 90,000
Not done any major changes. (most parts are factory fittings. Changed only tyres and regular services)

Looking forward for all you suggestions and help at the earliest.

Pradeep

.. Hello Pinaki sir, I would like to know from Pinaki Sir if this NGK CR7 spark plug will really help because in this thread there has been lot of posts in favor of a non resistor type spark plug Viz. U4A model. I remember my bike came with a BOSCH spark plug. I couldnt find a BOSCH U4A plug so I just modified the Champion spark plug and made it a not resistor type. NGK CR7 seems to be a resistor type and do you think I should give it a try.

Usually members come for help here. After help no one visits this place. One this thread was the knowledge hub of this forum. but slowly members stopped technical discussion and i as a result stopped posting here.

I would ask you all to continue discussion here. Both the new members can post their ownership experience with some photos. Others can talk about technical things. Or even can ask some problems or anything they want to know. It doesn't necessarily mean problem with bikes. Something that they want to know about bike.

And there is a splendor classic owner here. He is not posting anything here. I don't know why?

Members can post photos of there ride.

Lets bring this thread to old glory.

Paul, shoeb, rohit where are you.

We are old school mechanics. We don't need diagnostic tools and all such. We can know by feel and touch much like those old age mechanics.

So comeback guys.

You still haven't solved your bikes problem. you just have adjusted the problem with out of book solution.

First of all i do not trust rebore. usually they just taper out the bore while re-boring thus leading to leaky compression and oil consumption. I don't know the quality of work, so can't comment. Also new bore is cheap for passion.

And that oily spark plug, then you have to see if it is oil or petrol. Easy way to find is smell. If its petrol will smell like petrol. Even the exhaust gas will smell like petrol.

Else check the end of silencer. Stick a finger and wipe it. If its oily then its engine oil getting burnt. If its sooty and carbon then its too rich mixture.

For rich mixture there are three causes.
1. Incorrect timing. Need to open timing chain cap and check.
2. Carburettor tuning- Not only air screw, but with time the tip of air screw gets some marks and also the o-ring hardens. Change that and you will see a mark improvement in adjustment. Usually 30-40k kms between changes is ideal.
3. Ignition Voltage- With time your ignition voltage decreases. After sometime the the voltage will be less which will cause improper burning and giving same symptoms as rich mixture.

You said your spark is reddish. But why? When all other bikes are running on resistor spark plug perfectly, why is your bike not .

Its simply because the resistor is dropping voltage and your bike has already low voltage. Remember resistor opposes voltage and not current.

So solution is to change charging coil in magnet and also get the ignition coil under tank checked. Get both these changed and bike will perform like brand new.

Its definitely Engine Oil on the spark plug. I can confirm it because as soon as I start the bike, first 10-15 puffs of exhaust smells as if oil is burning in combustion and after 4-5 seconds it smells perfectly like 4 stroke petrol engine. (I know the difference of both the smell)(It does not give white smoke its just the difference in smell)