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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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Old 27th October 2020
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Default Fork oil q

What weight of fork oil is best for the early 33.4 front ends? My bike is equipped with the 1969 version of that fork. Also--any favorite brands?
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I'm running 10w fork oil in my 77 XLH, 07 Dyna and the Wife's 04 1200 Custom.
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I just used off the shelf ATF.
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http://sportsterpedia.com/doku.php/techtalk:ih:susp01.1

http://sportsterpedia.com/doku.php/t...usp01#fork_oil
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i use lucas synthetic heavy (15) or extra heavy (20). works well in the early front ends. Best part is that it is available at most normal auto parts chain stores.
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Nice thing about using the regular synthetic is that it won't bankrupt you if you want to use a heavier or lighter oil. Nota bene: after you replace the oil, give the machine a long ride in warm temperatures when you can - then go somewhere where you can try the brakes. Give the machine at least a 30 mph run-in and then brake hard. If you get full fork depression, go to a heavier oil...
Also, and available here,
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Depends on the condition of the forks and how and where you ride.

Most just opt for something heavy in in the hopes of reducing leaks past the bushes.
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