Can one of you fine gentlemen tell me the weight of standard Harley fork oil please.

I replaced the Type 'E' with some 7.5 weight oil in my FXDX and didn't notice any difference.

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Thanks Adam, I had it in my head that the type E was equivelent to 20 weight
I want to play around with some different weights but I need to know where my starting point is.

Fork oil weights appear to be as variable as the colour of the packaging!
I have not done any checks on fork oil "E" but Buell suspension for me works very well within the ranges of a few clicks either way on the compression / rebound adjusters.
I have looked at a number of fork oils, Ohlins, Hyperpro, Silkolene, Putoline to name a few. I have not yet found one manufacturer grade the same as another.
To put this into context my "experiments" are basic. I use a viscosity cup as used for getting paint viscosity correct for spraying. These viscosity cups are available from paint factors.
All I do is fill it with the chosen oil and time with a stopwatch, how long until the oil flows through. I do this at ambient temperature and it is only relevant on the day as a comparison between different oils at the same temperature.
I have found big differences in the vicosity between one manufacturers 10wt (for example) and anothers.
I would suggest trying the viscosity cup method with "E" oil and what you wish to change it for to get a comparison.
I have had very good repeatability with Hyperpro and Putoline fork oil measurements but this is not to say others are not as good. The thing to bear in mind is that one manufacturers grade does not seem to be the same as the same grade from somebody else.
My advice would be to select a manufacturer ( at the moment I would say Putoline) get a range of their viscosities and compare with Type E then blend to suit.
If you stick with the same manufacturer I would not expect a problem in using (say) 40 % 7.5 wt and 60% 10wt to acheive the viscosity you require.
I do think this is a bit "overkill" for road use though!

thanks for the reply vern, I must admit I wouldn't of thought of a viscosity cup although I used to use them when I started spraying

I use 10wt racing silkolene. 10wt being the equivalent to type E as advised by Silkolene. Believe it gives me great feel and control over compression and rebound. Bike is a 2007xb12r and i weigh 13.5 st fully kitted

Harley dealer sold me Type 'B' for my Buell. Was a good job I went to Maz who put in the correct Type 'E'.

Still, I suppose B and E could look very similar to the optically challenged.