Looking at BD's website, I only saw 2 carb choices in the fuel category.
1. was the 30mm CV style carb for 175cc engine and larger. Said nothing about it's place of origin.
2. was the Mikuni 26 VM round slide carb.
There seems to be some sort of confusion on the carb in your pic. "Designed in Japan" normally means made in China.
Liduno is right about that UNI filter. With it being out in the open like that, it normally runs a bit lean and requires rejetting.
3 questions.
1. Have the air temperatures dropped in your area lately? You may have been running a little lean before when air was warmer, but now that's it's getting colder, the engine may require more fuel.
2. Are you sure you're not getting an air leak somewhere? Intake manifold leak, vacuum hoses in good shape and properly connected?
3. In all of your carb cleanings, have you ever messed with the float height? Have you ever checked your float height since the problems started?
Please post a good clear picture of your carb and vacuum hoses hooked up for us to see. Thanks
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My Yerban assault vehicle: 2.2mm stroker crank, 62mm Nikasil cyl, Taida large vavle head, American made valve springs, ported intake manifold, TM 28mm carb, stock CDI, Bando coil, TK exhaust, stock CVT except for the 14g sliders, 13/40 internal gears, 16T drive, 31T axle sprocket, 22" rear tires, and ONE BIG POTATO CANNON mounted on top..........
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