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Husqvarna MX & Off-Road Dirt Bikes
2-stroke fuel in a 4-stroke motor
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[QUOTE="TimberPig, post: 1030992, member: 66421"] That is what I was already trying to say, was that you cannot just dump premix into a 4 stroke bike and ride it. However Stihl has developed a 4 stroke engine that they are using on some of their string trimmers and brushcutters, that is a 4 stroke engine lubed by premix. It has passages to allow the oil to lube the crank and main bearings, so a premix 4 stroke is possible. The transfer ports aren't the reason why the oil can lube the bottom end in a 2 stroke. They serve to channel the air/fuel mix from the crankcase into the combustion chamber. By the time the air/fuel mix goes up through the transfers, the crank has already received its lube as most of the oil has dropped out due to the rotation of the crank. The fact the air/fuel mix, which contains the mix oil passes into the crankcase where the oil separates out of the mix, is what allows a 2 stroke to be lubed with premixed fuel. You can read about it here [URL=http://www.stihlusa.com/whatsnew/news_fourmix.html]Stihl 4-Mix[/URL] [/QUOTE]
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Dirt Bike Discussions By Brand
Husqvarna MX & Off-Road Dirt Bikes
2-stroke fuel in a 4-stroke motor
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