all change again.
The JT carrier and a renthal sprocket with gold chain seems to be the way to go. Trouble is I can't source a 42 sprocket for a 525 chain. So, changing chain and sprockets to a 520 appears to be another solution with the added bonus of lower unsprung weight and (allegedly) a small increase in power. I'd be happy to be persuaded otherwise if there are any reasons why dropping to 520. I guess chain will wear quicker but I can live with that.
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