they also are able to big bore kits for the nsr250 280cc and 300cc which is my next project.

Lilblackcooper
Given the sterling to dollar exchange rate you might want to consider a 300 kit from a certain Thailand supplier.

I used to have a "lilblackcooper" way back when, a 1968 Downton 1293 S
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If the rats eat my wiring one more time....