After previously installing the thicker battery, starter and ground cables I think I fixed my 2018 starter by installing a more powerful 240 CCA battery yesterday. I bought the Antigravity ATZ7-8 Lithium battery that Gasgas recommends to fix the starting problems for the 2018 and 2019 250 and 300s.
The stock replacement lithium battery only had 110 or 140 CCA which did not seem to be sufficient.
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