How big upjet for Proma GP?

Ljupa /
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Let's make it short:

Stock Puch E50 with only less restrictive air box (higher flow) and 14mm Bing.

62 jet with stock pipe. Jetted perfect.

What jet with Proma GP? Have 68 and 72 at hand. Will one of these work or I need to buy more?

Searched spreadsheet but still not sure.

Thank you all.

Respect

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