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I have searched through site and all I have found is that there are so many changes that I need to ask the following:

Is the standard or normal set up for a Falco a 15t front and 41t rear sprocket and the chain is a 525 type.

By normal I mean the 15t is used by most to keep the front wheel under control and I have that fitted to mine.

I did find something about people finding it difficult to get the correct rear sprocket and having to shim it out in order to get it to fit, I did come a cross a thread where someone had a correct one made by a company called B&C.

Basically looking for a complete change of transmission in one go.

From the factory the chain is a 525, the front sprocket a 16t and the rear sprocket a 41t.

The consensus is to stick with a 525 chain (the 520 being a bit weedy for a thumping V-twin)

Many of us prefer to change the final gearing to pep up acceleration and, more importantly, to improve the ride around town (slow corners at junctions etc)

If not wanting to change the chain, many of us will fit a 15t front sprocket.
If changing the complete set, you have more options.

Comparison of Ratios:

• 16/41 gearing = 0.3902 (standard)
  16/43 gearing = 0.3721
  16/44 gearing = 0.3636
  15/41 gearing = 0.3658

Compared to standard gearing:

• 16/43 gearing is a reduction of 4.64%
  16/44 gearing is a reduction of 6.82%
  15/41 gearing is a reduction of 6.25%

Basically 16/44 and 15/41 give about the same effect.

Remember that for every tooth reduction you need to shorten the chain by a link and for every tooth addition you need a chain that is longer by a link.

Thanks D-Rider as ever quick and effective, I will use the "standard" set up of 15 - 41 when required.

Since that was successful I will now ask has anyone recently bought a rear sprocket (41) that fitted as it should with no fettling, from what I have read on this site via the search function the original one was flat and modern one's are recessed and have to be spaced out in order to fit.

I used Talon sprockets front and rear, no problems, 15 tooth on the front and std 41T rear, but aircraft quality alloy.
Looks great and wearing very well so far, (been on 5 years and around 12k miles).
I even fitted a new chain last year and retained the sprockets. The sprocket wear was so light, but chain had rusted badly.
I know it is not advised but wear still looks fine a year on.