Had a win today... Got sick of ordering and waiting for jets so bit the bullet and brought a large assortment, they arrived during the week.
Started with idle jets, from what I've read the optimum setting for the idle screws is 1 1/2 turns. Went from a 50 up to 60 idle which set it at 2 turns. Tried 65's which got it to the magic 1 1/2 turns but the engine seemed to go 'flat' under 2500rpm.
Back to the 60's and in with some F7 emulsion tubes to richen it down low, same thing idle screws perfect but an even worse flat spot at lower revs. So back in with the F11's.
A bit more fettling and looks like I'll have to settle on around 2 turns.
Power is good now, up there with the sidedraughts it used to have, it's smooth, really free revving and sounds great. With the rest of the country in a heat wave we've had record rain here in Perth so its staying in the garage today but I'm looking forward to getting it out for a proper run and some more tinkering in the coming weeks...
Cheers Drew