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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="greg brillus" data-source="post: 57524" data-attributes="member: 597"><p>The vent on the oil tank that feeds down to the chain is actually a hole on the right side of the steel block that is welded inside the neck of the oil tank spout. It is quite hard to see unless you look closely for it. This vent is always open, the adjuster screw simply lets a metered amount of return oil enter that passageway, and then down to the chain. Unless the tiny hole in your tank cap can vent well enough, blanking off the chain oiler at the rear of the Upper frame will pressurize the oil tank. I originally blanked my oil tank this way too, but once I discovered that the tank cap hole could not keep up, I removed the blank, and opened it again and ran an extension hose to the rear axle, this with a "T" piece coupled to the engine breather.....remember that the scavenge pump is returning at least double the volume of the delivery. Even though most of it is a mix of oil and air, it is still a larger amount than is being taken from the tank. At elevated speeds I no longer get any oil coming out of the tank cap hole........Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 57524, member: 597"] The vent on the oil tank that feeds down to the chain is actually a hole on the right side of the steel block that is welded inside the neck of the oil tank spout. It is quite hard to see unless you look closely for it. This vent is always open, the adjuster screw simply lets a metered amount of return oil enter that passageway, and then down to the chain. Unless the tiny hole in your tank cap can vent well enough, blanking off the chain oiler at the rear of the Upper frame will pressurize the oil tank. I originally blanked my oil tank this way too, but once I discovered that the tank cap hole could not keep up, I removed the blank, and opened it again and ran an extension hose to the rear axle, this with a "T" piece coupled to the engine breather.....remember that the scavenge pump is returning at least double the volume of the delivery. Even though most of it is a mix of oil and air, it is still a larger amount than is being taken from the tank. At elevated speeds I no longer get any oil coming out of the tank cap hole........Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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