can the different available large spring tension or faulty small spring (the one that fits under the diaphragm) alter the air/fuel ratio to cause a rich mixture to the engine and hence the smoke?
If springs are not working correctly I can't see why it would blow smoke,as I'm guessing the smoke will be a blueish in colour which would signify oil is being burnt.
Now I know you said it is a full crank 160cc.
What is the engine off?
Do you know how old it is?
If you don't know post the engine number up and I'll see if I can get some more info on it.You have me curious now.
Also with the smoke.
Do you know if it has been sitting for long?
How long did it smoke for?
Was it thick smoke?
If you could try and post some pictures.A picture is worth a thousand word.
