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I can't find any info for a 10 or 11 450R. Correct me if I'm wrong, but the last TRX450R was 2009. There was no TRX450 poduced in 2010 or 2011, then in 2012 the only TRX450 was the ER model.

Leave the pilot jet stock, increase the main jet by 2 sizes. If your main jet is a 122 (std for both the 09 R and the 12 ER) then go to a 128 - then try it to see if it is adequate. If it surges go up 2 more sizes, if it blubbers, go down one or back to stock.
 
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