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It should be in the Service Manual. The manual for the Classic states:
Oil Type: SHOWA SS-8 or equivalent
Capacity:
Oil change: approx. 355 mL (12.0 US oz)
When dry: 417 +/- 2.5 mL (14.1 +/- 0.084 US oz)

Not sure of the capacity for the Custom. Maybe you can Google it.
 

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I used 10w filled 6 1/4 inch from the top with out springs & compressed. I always thought the forks are the same from custom to classic. Even if they are different that measurement should work.

To do the job you would need the tool for the fork cylinder. It would be nice to know what that tool was if its a 18mm hex then you can put to 18mm nuts(jammed together) on each end of a threaded rod to hold the inside cylinder.
 

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It should be in the Service Manual. The manual for the Classic states:
Oil Type: SHOWA SS-8 or equivalent
Capacity:
Oil change: approx. 355 mL (12.0 US oz)
When dry: 417 +/- 2.5 mL (14.1 +/- 0.084 US oz)

Not sure of the capacity for the Custom. Maybe you can Google it.[/QUOTE
Capacity is 14.5 oz if the fork was totally disassembled and dry.
Before you go to the trouble of taking everything apart, try using a piece of 35mm film strip to clean the oil seal. Pry the dust seal up and out of the way then use the film strip in a sawing motion between the tube and the seal and go all the way around. Don't go too deep because the film strip will contact the metal guide. The little square holes are suppose to help capture any dirt that's causing the seal to leak. If you don't want to try it yourself take the bike to any shop that services dirt bikes and they will know what you want.
 

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Discussion Starter #6
It should be in the Service Manual. The manual for the Classic states:
Oil Type: SHOWA SS-8 or equivalent
Capacity:
Oil change: approx. 355 mL (12.0 US oz)
When dry: 417 +/- 2.5 mL (14.1 +/- 0.084 US oz)

Not sure of the capacity for the Custom. Maybe you can Google it.[/QUOTE
Capacity is 14.5 oz if the fork was totally disassembled and dry.
Before you go to the trouble of taking everything apart, try using a piece of 35mm film strip to clean the oil seal. Pry the dust seal up and out of the way then use the film strip in a sawing motion between the tube and the seal and go all the way around. Don't go too deep because the film strip will contact the metal guide. The little square holes are suppose to help capture any dirt that's causing the seal to leak. If you don't want to try it yourself take the bike to any shop that services dirt bikes and they will know what you want.

Good Find...I'll take a look!
 
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