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FJR Motorcycle Forums
Technical & Mechanical Problems
Gas in Oil-- How?
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<blockquote data-quote="SwollenRaccoon" data-source="post: 873824" data-attributes="member: 19178"><p>That's a good and probable explanation. Here's what happened to me 17 or 18 years ago....</p><p></p><p>I had an '82 Seca Turbo that started getting gas in the oil. The problems were 1) A fuel petcock with internal leaking o-ring, and 2) At least one failing float in the carburetor float bowl. So....</p><p></p><p>The gas leaks past the fuel petcock when the petcock is in the "off" position. Then, when the fuel reaches the carb float bowls, the bowls should fill to a level that will allow the rising float to shut off fuel flow to the carburetor. However, I had one carb with a leaking float, so the fuel flow would not stop filling the failing carb. It fills to the point of overflowing, running down the cylinder wall to the crankcase.</p><p></p><p>I rebuilt the petcock and 4 carbs, and never had an issue after that. Thankfully, Yamaha had the parts available, but back then, the bike was only 10 or 12 years old. AND, that bike was carbureted. So I know the above explanation is irrelevant.</p><p></p><p>Make sure you change that oil, after you fix the problem, and then do it again after a few hundred miles. That gasoline can't be good for things like crankshaft bearings and the like.</p></blockquote><p></p>
[QUOTE="SwollenRaccoon, post: 873824, member: 19178"] That's a good and probable explanation. Here's what happened to me 17 or 18 years ago.... I had an '82 Seca Turbo that started getting gas in the oil. The problems were 1) A fuel petcock with internal leaking o-ring, and 2) At least one failing float in the carburetor float bowl. So.... The gas leaks past the fuel petcock when the petcock is in the "off" position. Then, when the fuel reaches the carb float bowls, the bowls should fill to a level that will allow the rising float to shut off fuel flow to the carburetor. However, I had one carb with a leaking float, so the fuel flow would not stop filling the failing carb. It fills to the point of overflowing, running down the cylinder wall to the crankcase. I rebuilt the petcock and 4 carbs, and never had an issue after that. Thankfully, Yamaha had the parts available, but back then, the bike was only 10 or 12 years old. AND, that bike was carbureted. So I know the above explanation is irrelevant. Make sure you change that oil, after you fix the problem, and then do it again after a few hundred miles. That gasoline can't be good for things like crankshaft bearings and the like. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Gas in Oil-- How?
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