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Dirt Bike Mods & Maintenance
Seize by too lean jetting
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[QUOTE="whitesands26, post: 592617, member: 36778"] Going rich or lean needs to be clearly defined to what context and is usually a term used when discussing jetting which is the AIR to FUEL ratio...... And as many have already pointed out MORE AIR and less fuel = a leaner condition = more heat...In a two stroke mixed at 32:1 more fuel and less air= richer condition = cooler running bike and more oil to lubricate moving parts... Your fuel oil ratio needs to be accounted for in your jetting....When you add more oil to the gas you effectively LEAN out your FUEL TO AIR RATIO (less gasoline and more oil to the amount of air) Therefore you end up with a warmer running engine and more splooge....I don't care how rich your FUEL/OIL ratio is, too much heat is not a good thing.... Now if you richen your fuel/oil ratio(more gas to the amount of oil per given volume of premix) then you richen your air to fuel ratio(more fuel to a given volume of air). At the same time you have LESS oil per given volume of fuel which is not a good thing either.... The best thing to do is to find an IDEAL premix ratio(usually 32:1 but 40:1 on a 250 won't hurt) and jet your bike according to atmospheric conditions...For motor longevity it's always better to be a little too rich than too lean. You want to find the right balance of power and motor protection... [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Seize by too lean jetting
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