Query Approved

AFAIK, White smoke is due to burning of engine oil. The piston rings might be causing the smoke, get them inspected again.
Did you overfilled engine oil?

Oops!

How long since you got your kit replaced?

Seems like whoever did it, did not do a good job.

Do the following:

1) Get the engine oil level checked, looks like too much; if ok then
2) Get the timing checked, if it is proper then

Possible that the valve guides have been worn/valves damaged or you might have burnt out the piston rings due to improper running-in.

Whats that ??? Timing dont scare him pls ..

Timing chain/sprockets connect the crank and the cam. Crank turns, driving the cam which are reponsible for the timing of valve opening/closing. Hence impoper valve timing (not ideal open/closure) will lead to improper combustion i.e. faulty engine operation.

Improper timing can lead to drop in perfomance , excessive smoke, low compression etc etc

But Ravi, which bike? Is it a 2 or 4 stroke?

I'm assuming it should be RE 350 or HHZMA or HHCD100SS. If then IMHO, you need to reconsider owning that one unless you give it a real Pro who has brains.

I'm more than sure that it should be the above reason.

if this is a 2 stroke(i am assuming it is because this is a 2 stroke forum), the 'engine oil' is actually the gearbox oil.
unless your oil seals are fine, it has no effect in the smoke output.
on a 2 stroke, bad piston rings do not cause excess smoke. thats only for a 4 stroke.
2 strokes do not have cams, valves and timing chains.

you said you recently replaced the piston. i assume its a rebore.
most probably, your mech has set the oil pump to pump more oil for the running in. talk to him and ask him when he wants to set it back to normal.

White smoke is sure sign of oil burning. If you are not using 2T oil with petrol, then oil is some how getting into the bore and burning with the fuel. In 4 stroke machines worn out/damaged rings, excessive piston gap & worn out Inlet valve guides can cause oil to enter the cylinder. Get these things checked.
In a newly overhauled engine, down south the mechanics used to mix engine oil in petrol to assist smooth running in of the engine. Is this the case with your Bike?.

Thank you very much everybody for replying. Your suggestions will help me fix the issue that I'm currently experiencing with my RE.

The engine was overhauled recently after the pistons were seized.

Bike has hardly run 50 Km after the overhaul. Will check the points that you have mentioned.

Sorry I did not mention the bike. It is my RE 350.

It is rebore and will check with him if has set the machine to the same setting.

Thank you sir. I will get these things checked.
I'm not using 2T Oil with Petrol. I will make a note of the points that you mentioned and have that checked with the Mechanic.
Also this smoke comes out only in morning when I start it. After that through out the whole day. I don't see them.

i am sorry but i think there is a confusion.
all 2 strokes do burn the oil in the cylinder(bore). you can either put it in the fuel tank as premix or use the oil pump which meters oil via the carb.

white smoke is surely a sign of oil burning, but its nothing to worry about as long as there is no other issue.

also, if it is fine when warmed up, dont worry about it.

cheers

For a 2 stroke its true. But for a 4 stroke, its a different story altogether. I would like a little info here.
I understand that in the new generation 2-strokes where oil is not mixed with the fuel, oil is pumped in to the cylinder for lubrication, right?.

Now the question. Does all such the 2-strokes follow the same principle of pumping the lubricating oil into the carburettor inlet/outlet or some machines pump the oil into the cylinder walls itself?

I remember , in olden days RD-350 owners used to disable the oil pump and mix 2T oil with the fuel as the pumps used to malfunction and results in piston siezure.
I am not sure if this practice is still followed.

Yes, atleast I follow this practice of mixing 2T & fuel in my tank for Rx100. Reason? When I got my carbs changed from stock to 28mm flat slides, the pump & tank were leaking oil. Hence decided to stop the pump & started mixing from then on.

Now the guy is really confused

Get the oil level checked. More oil than required.

Wow...... you mentioned the concern but failed to mention the bike. And all of us here gave our valuable inputs.

Anyways, smoke from a four stroke machine can be a concern but it again is a very relative matter. First thing first, what kind of weather you have in your city.

"Cold mornings" or "post rain starts" emits white smoke. It has much to do with the Water Vapours coming out from the relatively cold silencer during cold starts. Also, try to see if people around your place are facing the same concern during mornings?

Secondly, make sure if the first option is ruled out, then please check the Level of engine oil of your bike. A drastic reduction may mean that the Engine is consuming the oil mean for lubrication only.

thirdly, check the spark plug.If it is black with saute, it can be due to excessive fuel being fed to the engine owing to the recent bore. Also, if the engine is consuming oil, where in you see the level going down, there would be oil on the spark plug threads before the cold start. More over, there would be excessive carbon deposits on the electrode.

lastly, take it to the reliable mechanic as he knows the best. A good mechanic can tell you the fault even by inhaling/ smelling the exhaust fumes, or by putting his hand near the exhaust tip when the engine is running.

Oops, please check these two things too!

1. Quality of fuel used. Excessive adulteration with foreign elements can also produce excessive smoke.
2. did anyone by any chance add mobil oil or 2T oil to the tank when you went for the engine rebore. Though it is not an advisable thing to do, but few school of thoughts promote adding the oil to the tank during initial days after engine rebore.

P.S: If you do not see the decrease in engine oil level and if your bike is delivering the right fuel efficency, then let the people behind you enjoy the cloud of smoke you leave behind.

All Peace

dcs