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ACCORDING TO FACTORY RECOMMENDATIONS, THE PERFORMANCE OF THE K-151 UN CARBURETOR SHOULD BE ABOUT 7 TO 13 cm³ IN 10 CYCLES. A COMMON REASON FOR THE “FAILURE” OF THE UN IS THE ELEMENTARY LOSS OF THE BALL OF THE UN SUCTION VALVE OR ITS “SOAKING” IN THE CHANNEL (LOCATED UNDER THE NEEDLE WITH THE PLUG), A MALFUNCTION OF THE DIAPHRAGM (ESPECIALLY IF THE CARBURETOR IS PERIODICALLY “SPRAYED” WITH CLEANER, IT SIMPLY “STINKS”), THE SPRAY NOZZLE IS NOT TIGHTENED TIGHTLY, LARGE GAPS IN THE UN DRIVE. MAIN WORK CAN BE CARRIED OUT WITH THE CARBURETOR NOT REMOVED FROM THE CAR (REPLACE THE DIAPHRAGM, IT IS PREFERABLE NOT TO LOSE THE SPRING), REMOVE AND CLEAN THE SPRAYER OR SIMPLY TIGHTEN IT, BEND THE CRUSH LEVER TO THE CAM, SELECTING THE CLEARANCES, ADJUST THE DIRECTION OF THE JET AND EVALUATE ITS QUALITY, BUT IT WILL NOT BE POSSIBLE TO MEASURE THE PERFORMANCE... ALTHOUGH, INDIRECTLY BY THE DURATION AND QUALITY OF THE JET, WITH CERTAIN EXPERIENCE, IT IS POSSIBLE TO FIND THE OPTIMAL POSITION OF THE ADJUSTING SCREW DRAINAGE CHANNEL, WELL, A TEST RIDE WILL SHOW THE RESULT. GOOD LUCK TO EVERYONE ON THE ROADS!