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Wondering if anyone can help I’ve got a 2001 Yamaha Dt 125 r working power valve model with a full dep exhaust runs and rides fairly nice bit boggy when warming up but other than that it rides okay although when changing my spark plug recently it was black but no excessive build up, the air box is standard and has the snorkel I’m assuming it’s running a bit rich but I’ve heard that the standard 240 main jet is correct for a full dep system on a Dt so I don’t know if it’s my fuel/air screw that needs adjusting which is currently at 1 and a half turns out.

any advice would be appreciated
Thanks
 
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