I run an LRP Shpere Comp in both my ZX5 and my B4, and I'm not going back. Nothing to do between rounds but sit back and enjoy watching some bloke skimming a motor (I have a lathe for sale btw), and Kirky rebuilding another gearbox. :P
I ran a 4 star (equivalent of a 7 turn) in my B4 on Sunday, "for a laugh", and it was silly. Ran it on an 18 pinion because I couldn't get the motor close enough to the spur with a 17. As Mr Doughty says, the 3 star is probably about right for most things.
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