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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
What A Great Day!!!!!!!
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[QUOTE="gooby, post: 354969, member: 25707"] it's better cause u leaned er out , a lean running motor creates more power to a point of going too far. don't mess with the premix .i've heard many here run 50:1 u should b able to tune to that.premix is not a jetting tool unless u fully understand it's effects on the engine. this is from gorrs paper :Fuel and Oil Mixture Ratios When we talk about the "fuel" in the air-fuel mixture for a two-stroke engine, we are really talking about a mixture of fuel and oil. If you richen the pre-mix ratio (20:1 as opposed to 30:1) there is more oil and less fuel in the same volume of liquid, which effectively leans the air-fuel ratio. And this fact gives the clever tuner one more tool to use when the correct jet is not available or when none of the standard jets are exactly right. You can richen the jetting by slightly reducing the pre-mix ratio (less oil). You can lean the jetting by increasing the pre-mix ratio (more oil). The best part is that changes in the pre-mix ratio affect the jetting over the entire throttle-opening range, but the changes in ratio must be small to prevent excess wear from lack of lubricating oil or fouled plugs from too much oil. Pre-mix oils are formulated for a fairly narrow range of pre-mix ratios. You should examine the oil bottle for the oil manufacturer's suggestion on the pre-mix ratio. All production two-stroke dirt bikes have a sticker on the rear fender suggesting that you set the pre-mix ratio to 20:1 That sticker is put there for legal purposes. Always refer to the oil manufacturer's suggestion on pre-mix ratios. In general, small-displacement engines require a richer pre-mix ratio than do large-displacement engines because smaller engines have a higher peak rpm than larger engines. The higher the engine revs, the more lubrication it requires. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
What A Great Day!!!!!!!
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