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FJR Motorcycle Forums
Technical & Mechanical Problems
Fork Oil
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<blockquote data-quote="MCRIDER007" data-source="post: 1068077" data-attributes="member: 329"><p>I'm not sure what you are saying here....do they drill out the high speed or low speed orifices? In the FJR's case there is nothing to drill out in the high speed circuit, they replace a spring loaded one way valve with a shim stack that has variable (and higher) oil flow. There isn't any technical reason to use a heavier viscosity oil after drilling out an orifice since that partially cancels what you are trying to achieve.....except to lower the cost of the oil. For some reason the manufactures offer the heavier weight oil (at a big discount) in 55 galleon drums and the suspension shops go through a lot of oil.</p></blockquote><p></p>
[QUOTE="MCRIDER007, post: 1068077, member: 329"] I'm not sure what you are saying here....do they drill out the high speed or low speed orifices? In the FJR's case there is nothing to drill out in the high speed circuit, they replace a spring loaded one way valve with a shim stack that has variable (and higher) oil flow. There isn't any technical reason to use a heavier viscosity oil after drilling out an orifice since that partially cancels what you are trying to achieve.....except to lower the cost of the oil. For some reason the manufactures offer the heavier weight oil (at a big discount) in 55 galleon drums and the suspension shops go through a lot of oil. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Fork Oil
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