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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
YZ 125 Fuel
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[QUOTE="rmc_olderthandirt, post: 1197174, member: 68872"] Unless your engine has been modified to increae its compression ratio then standard premium pump gas should be fine. You need to run a high enough octane to avoid detonation, but running a higher octane than necessary will provide no additional benefit. Depending on the year and model of your bike even regular gas could be fine. The critical factor is the compression ratio of your engine. A "high performance" engine will typically run a compression ratio around 12:1, which requires an octane of 91. The more standard "non performance" compression ratio run around 9:1, which can run on regular gas. Most late model race bikes will have the higher compression, requiring premium. Some racers will modify the heads or install taller/dome topped pistons to increase the compression ratio and then run really high octane race gas. The probability is that your YZ has the 12:1 compression ratio, especially if it is a later model. If you are not sure then it would be safe to run the premium, as it certainly won't hurt anything and the cost difference isn't worth the risk. Rod [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
YZ 125 Fuel
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