It all depends on of what type of needle you have got, what height it's at, the anti-skipping and so on. There's no general setting. Just read the documentation that comes with the needles.
If you are using Ortofon/Concorde needles just put the weight at its heavyest or even take the weight of and put it back on again the other way round, if you need even more weight. Make sure that the needlecartridge itself isn't touching the record, especially with those bendy and curved bootlegs. I've had this before in the past and it only took slight adjustment to fix it so it can be very critical if you want to use heavy weight on your needle.
But remember, heavy weight on your needles is not good for your records (they wear out faster)
Like I said before: check the settings in the manual.