So you skimmed the head, but didn't open the chamber? 1mm will be 4cc so if I'd done that to mine I would have had 14.8:1 compression ratio. Which is a mighty high compression ratio for a 300.
Has it ever run well?
Maybe you've fixed the first issue and clouded it with too much comm?. Perhaps your local gas needs a smaller main as well.
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'07 EC300 GG
'14 TXT250 GG
'? 496 CPI Cheetah RZ/RGV hybrid
'22 765 Street Triple RS
'21 XTrainer
'69 Stinger T125 Suzuki
'23 TRS 250RR (it's a Trials thing)
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