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FJR Motorcycle Forums
Technical & Mechanical Problems
Fork Oil
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<blockquote data-quote="MCRIDER007" data-source="post: 1068209" data-attributes="member: 329"><p>I'm not seeing any spacer with your OEM spring....probably because it is very narrow and barely fits over the damper rod taking almost no space at all inside the fork....in contrast your aftermarket system has both a thick plastic spacer and a spring guide. The air space is used to to give a progressive resistance at the end of the stroke to prevent bottoming and is very sensitive to volume changes. Too little air can result in excessive air compression and can blow out fork seals. Suspension companies recommend heavier oil because that is what they are able to buy in bulk sizes and use to develop their damping pistons and curves...the calculation of the correct air space is totally independent of oil viscosity because it doesn't matter what the oil weight is, it is not going to compress inside the fork and offer a progressive resistance. Its either going to move out of the way or create a hydraulic lock.</p></blockquote><p></p>
[QUOTE="MCRIDER007, post: 1068209, member: 329"] I'm not seeing any spacer with your OEM spring....probably because it is very narrow and barely fits over the damper rod taking almost no space at all inside the fork....in contrast your aftermarket system has both a thick plastic spacer and a spring guide. The air space is used to to give a progressive resistance at the end of the stroke to prevent bottoming and is very sensitive to volume changes. Too little air can result in excessive air compression and can blow out fork seals. Suspension companies recommend heavier oil because that is what they are able to buy in bulk sizes and use to develop their damping pistons and curves...the calculation of the correct air space is totally independent of oil viscosity because it doesn't matter what the oil weight is, it is not going to compress inside the fork and offer a progressive resistance. Its either going to move out of the way or create a hydraulic lock. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Fork Oil
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