I didn't have ultrasonic but I tried some commercial carb cleaner and high pressure air. It seemed they were free.
I'm thinking there's something to Widebear's comment about fuel flow and intake velocity. An extremely slight slide adjustment makes a very large difference. That tells me it's either the design of the PJ circuit or something to do with the shape of the slide or the body. After a search I see some other members have had a virtually identical issue.
I was I could remember what the cutout #7 addressed on the motocrosser. It may have been a similar issue.
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04 Montesa 315R, 07 EC300, 21 KTM Erzberg 300, 21 Sherco 300 SEF-F, 23 KTM 690, 23 Rieju Mr Pro 300
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