first venture into jetting 14 bing

supermoto lew /
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Hello all ! Just hoping i can think aloud here and make sure im doing the right things !

some info first

1971 Puch 14mm bing stock airbox stock exhaust 30 mph uk model . carb has a 68 jet bike runs well and often edges over 30 .

Just brought a big bag of jets 62 all the way to 86 from puch shop just fitted a bi turbo pipe and a spare stock but trimmed larger hole airbox.

68 jet = bike lumpy power delivery bike edges over 30 depending on the road condition.

70 jet = pulls way smoother but 30mph is like hitting a spluttery wall patches of 4 stroking.

my next thought is to go back to 68 and drop the needle to the bottom.

(just a note even though the jets are new the 68 in the new looks bigger than the old 68 i have ?!?)

any thoughts guidence or advice ? first time playing with this .

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