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125Cc Fork Nuts? Oil And Capacity

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hi guys. I'm needing to change my fork oil and fit spacers as I have an inch of sag. I Dropped front wheel out. Loosened yokes, but can't undo top screw/bolt. All the chrome bit is turning. Did back up but the whole thing is just turning. I'm f****d if I can't get the nut off. Ordered spacers. Will get oil (once I figure out the type and quantity). There's no way I can change the seals. Never done it. How can I hold the chrome bit tight to get the top bolts out? They are 32mm. Cheers!

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It's about 1980. 32mm.

What grade oil should I use? And what quantity? Was told 5 or 10 grade and 200ml or maybe 250ml,...bit Vague!

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