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Message: [QUOTE="Jaybird, post: 1233638, member: 22283"] There are many 2T oils on the market today that can allow the rider to use a higher concentration of fuel and still see adequate protection. Synthetic esters and advanced additive packages have increased the integrity of 2T oils dramatically in the past 10 years or so. And when using one of these better made oils, you can run higher ratios of fuel/oil, such as 50-60:1 There are even products that could allow you to run a 2T at a mixture of 200:1 and still protect every bit as good as the conventional products do at 20:1...although none of these products are marketed for use as a 2T premix. However, it is a fact that different motors will require a different rate of protection. An AF500 will be fine using a quality oil at a 50:1 ratio, and with all it's abundant power, it is probably overkill to use more oil than 40-50:1 The smaller bore bikes require a bit more protection, due to their creating higher revolutions, and the style in which they must be ridden. 32:1 is probably the rule of thumb limit for 125's...although like I stated, there are products available that will protect at 40-50:1 even with the high revving engines. Testing concludes that more power is produced with a higher concentration of oil in the mix. This may in part be due to better sealing of the rings/cylinder walls. I use ~20-26:1 in all 2T engines. No matter what, you should always pick the ratio suited for the bike and style of riding, and only then start to dial in the carburetor to find the optimum mixed fuel/air ratio. On the issue of bikes being jetted for certain ratios at the factory... The settings on factory bikes are determined by an average, as there is no way to tell just what conditions the consumer has. Is he at sea level, or 10,000 feet? Is the buyer riding in the desert or in the jungle? See, the mfg has no way of knowing and providing a catch-all setting. So an average is computed, and that is what we have. It is not really that they jet the bikes for a particular ratio. That simply doesn't make sense, if you understand the dynamics involved. [/QUOTE]

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