Derbi flatreed gila 50

Alex Rice /
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Can’t seem to nail down the right needle for this setup- gila 50, stock head, stock reeds, 50cc zen, 19mm phgb/intake, k&n filter. Seems to want a high 80s main jet.. maybe a 90.. I can’t figure out the right needle.. it’s either lean in the middle and 4 stroking up top, or 4 strokes in the middle and a hair lean wot. I’ve got a modified reed block to throw on with some carbon reed.. just haven’t yet. If anyone has set this up with success I’d like to hear the numbers!

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