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Old 05-16-2018, 09:12 AM
rangerguy302 rangerguy302 is offline
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Air seals

I did the fork seals last weekend, no oil leak but I used 79special upper tubes and 79standard lowers. The special had air shocks which I wanted but they don't seem to hold air. Soon as I drop it off the stand they go splat. Still no oil leak though.... Did the air shocks take a different fork seals to keep the pressure?
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Old 05-16-2018, 12:09 PM
motoman motoman is offline
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Special and Standard use different diameter uppers and lower, plus Special uses Shoei and Standard uses KYB forks.
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Old 05-16-2018, 04:31 PM
motoman motoman is offline
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Hey Robert, last statement referring to which?......air shocks or fork seals. As far as forks, no, front forks use same seal whether air assited or not. No help associated with the rear air shocks, which were only offered on the XJ models.
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Old 05-16-2018, 05:49 PM
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Maybe the Schrader valve O rings are leaking at the fork caps. The OEM fork seals for the 80-81 Standard are probably the best bet for not leaking, they were designed for air assist.
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79F - owned since '89 - FJ fork mod, solo seat mod, Dyna 3Ω's, Kerker, 14MM M/C (152K miles)
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Old 05-16-2018, 07:54 PM
rangerguy302 rangerguy302 is offline
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I know the uppers were longer, had to use risers for the handlebars but they're 37mm tube right? They were tight and true on the beach and bike so far less the air deal .
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Old 05-16-2018, 08:55 PM
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Yes, both are 37MM.
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79F - owned since '89 - FJ fork mod, solo seat mod, Dyna 3Ω's, Kerker, 14MM M/C (152K miles)
79SF - every day rider, solo seat mod, Brembo 16MM M/C, Accel 3Ω's, Supertrapp (115K miles)

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Old 05-16-2018, 09:10 PM
rangerguy302 rangerguy302 is offline
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Ya know bikerphill....that's 1 link I didn't even think about. The o rings looked good, no tears or anything wierd and I reused them. Are they a specific ring or can I substitute a good automotive one to replace it?
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Old 05-16-2018, 09:14 PM
rangerguy302 rangerguy302 is offline
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Motoman, I put air shocks from a sec 650 turbo in the bike about 3yrs ago. I couldn't be happier with them, they are starting to show there age and the first oil ring has appeared.
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Old 05-16-2018, 10:13 PM
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Matching up the O ring(s) with automotive ones would be fine.
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79F - owned since '89 - FJ fork mod, solo seat mod, Dyna 3Ω's, Kerker, 14MM M/C (152K miles)
79SF - every day rider, solo seat mod, Brembo 16MM M/C, Accel 3Ω's, Supertrapp (115K miles)

"If it ain't broke, modify it"

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Old 05-18-2018, 01:28 PM
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Quote:
I did the fork seals last weekend, no oil leak but I used 79special upper tubes and 79standard lowers. The special had air shocks which I wanted but they don't seem to hold air. Soon as I drop it off the stand they go splat. Still no oil leak though.... Did the air shocks take a different fork seals to keep the pressure?
IIRC the special needed a spacer for the springs if they are aftermarket OR the standard springs. About 3" of PVC pipe is what was used. But PLEASE check FIRST, don't take the size as correct as it's been too many years since I worked with them. If the fork caps went right on without pushing them down, you have a problem.
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Old 05-19-2018, 09:47 AM
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80 & 81 standards had air forks that are a direct bolt on swap to your F and you don't have to mix and match internals.
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Old 05-20-2018, 07:30 PM
rangerguy302 rangerguy302 is offline
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Driverray, I had to stuff them in about 3in to tighten the caps. Forks are solid as they are just seem squishy to me.
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Old 05-22-2018, 08:35 PM
rangerguy302 rangerguy302 is offline
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Ba80, I didn't really want to go the route I did. It's what I had on hand, any tips on making the front end stiffer?
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