SMA HAS ROUGH ENG; LOW RPM. UNABLE TO MAKE LNDG ON RWY; USES DISPLACED THRESHOLD.

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I DEPARTED FROM W36 FOR BKT VIA PTB. I STAYED ABOVE 3500 FT UNTIL I VERIFIED THAT THE BKT TWR WAS NOT IN OP. THEN I CALLED CTAF AND WAS ADVISED WINDS WERE FAVORING RWY 19. I PULLED THE PWR TO 1000 RPM TO DSND; WITH CARB HEAT. AROUND 1400 FT I ADDED 10 DEGS OF FLAPS AND DID MY LNDG CHKS; 1 1/2 - 2 MI N OF BKT FIELD. I ADVANCED THE THROTTLE WITH NO RESPONSE. I SLOWED TO BEST GLIDE SPD 65 KTS; DID MY EMER CHKS; LOOKED FOR THE LOWEST SPOT IN THE TREE LINE; AND THE BEST PLACE TO LAND ON THE DISPLACED THRESHOLD AS IT WAS APPARENT THAT I WOULD NOT MAKE THE RWY. I LANDED ON THE DISPLACED THRESHOLD AND CAME TO A STOP ON THE ARR END OF RWY 19. THE ENG WAS RUNNING AT 800-900 RPM. I SLOWLY TAXIED TO THE RAMP. THE ARPT MGR CAME OUT TO MEET ME; AND WE LOOKED INTO THE COWLING. THERE WE DISCOVERED THAT THE BOLT CONNECTING THE THROTTLE CABLE TO THE CARB HAD FALLEN OUT. WE ALSO FOUND THE NUT; THAT SHOULD HAVE BEEN HOLDING THE BOLT IN PLACE; ON TOP OF THE CARB. AFTER CALLING THE FBO; I LEARNED THAT A NEW CARB HAD BEEN INSTALLED THE DAY BEFORE (NOV/SAT/93). APPARENTLY DURING INSTALLATION THE COTTER PIN HAD NOT BEEN PUT THROUGH THE BOLT TO HOLD THE NUT IN PLACE; OR THE NUT HAD NOT BEEN PUT ON AT ALL. THE MGMNT AT THE FBO SENT A PLT WITH A MECH TO BLACKSTONE TO FIX THE PROB. THE MECH FIXED AND TESTED THE PLANE; ALL WORKED WELL. I THEN FLEW BACK TO W36 WITHOUT FURTHER PROBS. WHEN I GOT BACK I TALKED WITH THE FBO I RENTED THE PLANE FROM; ANOTHER FBO; AND A PLT'S ASSOCIATION; AND WAS TOLD BY ALL 3 THAT IT WAS NOT NECESSARY TO FILE A RPT WITH THE FAA OR NTSB SINCE THERE WERE NO INJURIES OR DAMAGE TO THE PLANE OR OTHER PROPERTY. PLEASE LET ME KNOW; IF YOU CAN; IF THEIR ADVISE WAS CORRECT. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: CALLBACK MADE TO CONFIRM RPTR QUESTION REGARDING RPTS TO FAA OR NTSB. ADVISED HIM THAT HIS ADVICE WAS CORRECT. NO INJURY; NO DAMAGE; NO REQUEST TO RPT SO HE DOES NOT NEED TO DO SO.