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FJR Motorcycle Forums
Technical & Mechanical Problems
Fork Oil Change Made Easier
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<blockquote data-quote="hppants" data-source="post: 1254244" data-attributes="member: 27852"><p>Well, it's a hydraulic piston. Too much oil will make the system stiffer, and WAY too much oil will probably cause the seals to blow. Too little oil will make the system more spongie and the dampening will be less effective.</p><p></p><p>You don't need to measure it with a caliper. Get a wooden paint can stirrer and make a knife scratch (fine line) on it 3 5/8" from the end. Add oil until you it reaches the mark. As Bluesdog points out, you will need to burp out the air by exercising the fork. So fill the fork in two stages. Put about a 1/2 pint in there first, burp out the air, then top off the fork with the remaining amount. You will fill with the fork fully extended. Once filled, add the spring, spacer, and washer. Hold the fork extended with one hand firmly while you install the fork cap. If you let the fork collapse, the oil will overflow, make a big mess, and you will have to start over on your measurement.</p><p></p><p>Also agree with B/D regarding the order of things - loosening the upper triple clamp first will make breaking the fork cap much easier - I had forgot about that part. I'll change my previous post to reflect that.</p></blockquote><p></p>
[QUOTE="hppants, post: 1254244, member: 27852"] Well, it's a hydraulic piston. Too much oil will make the system stiffer, and WAY too much oil will probably cause the seals to blow. Too little oil will make the system more spongie and the dampening will be less effective. You don't need to measure it with a caliper. Get a wooden paint can stirrer and make a knife scratch (fine line) on it 3 5/8" from the end. Add oil until you it reaches the mark. As Bluesdog points out, you will need to burp out the air by exercising the fork. So fill the fork in two stages. Put about a 1/2 pint in there first, burp out the air, then top off the fork with the remaining amount. You will fill with the fork fully extended. Once filled, add the spring, spacer, and washer. Hold the fork extended with one hand firmly while you install the fork cap. If you let the fork collapse, the oil will overflow, make a big mess, and you will have to start over on your measurement. Also agree with B/D regarding the order of things - loosening the upper triple clamp first will make breaking the fork cap much easier - I had forgot about that part. I'll change my previous post to reflect that. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Fork Oil Change Made Easier
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