7/15/2023 0 Comments Download full throttle atvTo do that, we could start adjusting by adding gas or taking it away and see which improves our condition. We’ll need to understand which type of bog your ATV suffers from. Bad gas (under certain conditions, gas goes stale after one month).Vibration can also cause maladjustment of the air-fuel mix screw.īut there are many other possible causes, some of which include: What Causes a Lean Condition?Ī lean condition is commonly caused by normal wear and tear on engine components. It means the ratio of air to fuel is above the optimum 14.7:1.Ĭommon symptoms of a lean condition include:Ī lean running bike is common, and mechanics will usually identify the condition and make finer adjustments to the AFR at service intervals. Or too much air, whichever way you want to look at it. Lean ConditionĪ lean condition is an engine that isn’t receiving enough gas in relation to the amount of air it’s receiving. Your ATV engine runs at its very best here, and it’s this ratio a mechanic is chasing when tuning your bike. Stoichiometric is the optimum air-fuel ratio (AFR), and for gas engines, it’s 14.7 to 1. You may find these posts helpful they deal with rich running engines: Or, “the engine isn’t receiving enough air” is another way to look at the problem. Rich ConditionĪ rich running engine is an engine that is receiving too much gas proportional to the amount of air it’s receiving. So let’s find out which type of bog you’ve got, rich or lean. The adjuster screw is needed as engines move outside the optimum AFR as they age or after major engine repairs, such as re-bores, but temperature, elevation, and humidity will affect it too.Īn engine usually bogs because it’s running too rich, but a lean running motor is often described as bogging down too. The carburetor is calibrated and tuned from the factory but is fitted with an air/fuel mix adjustment screw. And it’s the job of the carburetor to make sure this ratio is maintained. That means your engine is at its happiest when the engine gets a mix of 14.7 parts air (oxygen) for every 1 part gas. Your engine runs at its best when the air-to-fuel ratio is 14.7:1.
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