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Sure, maybe that fuel economy is going through the floor after all...!
I took it round the houses, to the mechanics and back and the throttle felt almost loose. I guess it was happily drinking the petrol and producing power rather than dragging its way through a lean condition.
Going to ride it shortly to run an errand 10 miles away, and if it doesn't grenade then I'll ride it as-is on the green lanes tomorrow. That gives me next week to try to rebuild the flat slide carb with a different needle and jets. Keen to go back to the flatslide just to have maximum response vs the CV.
pdlouche-
You'll be safe on 140 I suspect, but I think you'll end up wanting bigger. Four strokes aren't quite as time-bomb like as two strokes if they're running lean. A handy trick for assessing the main jet is to get going fast, WOT, in 5th or 6th and if the engine picks up a bit when you just roll back the throttle a tiny bit, you're rich. If it doesn't, you can go richer.
Jung
Think about it this way, you’ve increased the pumping capacity of the engine by 10% or so, and also removed major restrictions (air box and pipe.) It’s not such a big jump at all.
Not a direct comparison but the main jets on my RD went from 120 to 230 after I ported and put pipes and filter on.