Quote:
Originally Posted by jamesqf
It's emissions, and noise. Ever watched the cloud of blue smoke that hovers over a bunch of 2-stroke engines - snowmobiles, dirt bikes, etc? That's unburned/partly burned fuel/oil mixture.
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The sound is not really bad at all. The blue cloud is less frequent with modern synthetic oils, or vegetable-based ones, which can be used at a lower amount, thus leading to less smoke and carbon deposits around the spark plug electrode.