Race organisers say there'll be two practice sessions tomorrow.
After weather caused problems for practicing earlier this week, the clerk of the course says there's a revised schedule over the weekend.
The Mountain Road will close at 9am with the rest of the course shutting for 10am on Saturday for qualifying - roads will reopen no later than 9.30pm.
Sunday's programme is unchanged, but the Supersport and Sidecar races will now take place on Monday.
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