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GrandPaul, The Bonneville Shop
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Original Post (Thread Starter)
#857543 09/02/2021 7:02 PM
by Waterloo John
Waterloo John
Hey guys
I know my discussion is regarding a modified bike, but as the front end I am using is a stock 1971, I thought maybe someone on this forum may provide the answer. I also posted this in the modified forum, but so far have not received a response, below is what i posted ...

I got the frame back from the powder coaters and have started my final assembly. I am using a 1971 front end for this project, but do not have a Manual for anything past 1970. How much fork oil is needed for this front end?
Thanks as always for the advice.
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by DMadigan
190cc is usually quoted, however, better to measure from the top down to the oil level.Damper head has to be covered with enough extra so oil sitting on the spring and tube will not leave the damper head without oil on top. Adding more oil increases spring from trapped air but does not change damping.
Early damper nuts have a hole out the top which shoots oil up to the fork cap and can starve the damper head of oil. Later ones have the hole out the side so oil stays down at the head.
Early damper tubes have two long slots in the side. These do not work. You need the later tube with the single slot down near the bottom. The early slots let oil past the damper head at about mid stroke which effectively negates the damper head.
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