I copied & pasted a post from MR Viper !
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its pretty much the same recipe as most of the other 8dn 20 set ups but that dalton 54/46 works awesome in it.
8dn-20 weights
4.5 rivets both holes, stock you only need to change out 1 rivet
w/w/w/yamaha spring in front
15.6mm stock rollers for srx
54/46 dalton helix with green yamaha spring at 60 twist, pretty much bang on 85-8600rpm, and it pulls HARD! all depends on how many stufds, how aggressive track, your weight and such but this is very very close.
if you put this set up in, ask for help if you need help to dial it in, no problem, will likely be within a 10 degree sec. adjustment is all thats needed. I have used this on 2-3 sleds and all were about perfect, just a twist or less twist was all needed to get spot on. ( one guy was 280+ lbs, we had to go back to the stock y/w/y with him but it was because of his weight and had 192 studs...heavy)
Very aggressive upshift and hard pulling mid to topend, good all around set up. Its trail set up not a race set up but its strong!