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lynx
As Lynx has said valve clearances are important.
Check the fuel mixture as well. I run mine a bit rich, just enough to crackle on the overrun. I did use a colortune to begin with but after a while I learnt to do it by ear. I carried a small screwdriver and made tiny adjustments to the mixture over the space of a month to arrive at my current settings.
Float height and carb cable condition can be a factor too.
When it all comes together the effect is pretty magical. I've not managed to get a garage to do a decent job of tuning engines, they get in the ballpark but you need to ride it and get a feel for different temperatures before you find a good compromise.