CARBURETOR FOR 18/6 HP ONAN ENGINE,#142-0568,NEED

NEED TO FIND A CARBURETOR FOR MY SEARS 1977 GARDEN TRACTOR 18HP TWIN , MODEL 917.25191

PART # 142-0568 OR A UPGRADED UNIT -- THANKS

HI
I BELIEVE ABOUT THE ONLY PLACE FOR A CARB. ON A SEARS SUBURBAN 16 OR 18 HP ONAN WILL BE ON EBAY, I HAVE DONE A LOT OF SEARS RESTORATIONS (20) SO HAVE A FAIR IDEA OF PARTS AVALIBLITY AND PRICES. NOT KNOWING YOUR PLANS FOR THE TRACTOR MAKES IT HARD TO SUGGEST THE ROUTE TO GO ON REPAIR. HAVE SEEN SOME NEW OLD STOCK (40YEARS OLD) FOR $200-$300, USED FOR $35-$45 STILL 40 YEARS OLD, WHY NOT USE A REBUILD KIT IN YOURS, IF IT IS FUEL PUMP PROBLEMS, JUST PUT $10-$15 EXTERNAL PUMP, IF YOU WANT TO REALLY FIX YOUR MOTOR MY ADVISE IS TO REPLACE THE MARVEL CARB WITH A LATER MODEL NIKKI CARB.FOR ABOUT $100 CARB.MANIFOLD OR ADAPTER & AIR CLEANER ASSY. THE NIKKI CARB, WILL MAKE YOU AND THE ONAN VERY HAPPY. CAN GIVE MORE DIRECTIONS IF YOU DECIDE TO REPLACE WITH A NIKKI.
HAVE A GOOD ONE
JIMMY
IN SOUTH GEORGIA

PLAN TO USE TRACTOR TO JUST PLOW SNOW.

SEEMS FUEL PUMP PROBLEM, WHAT TO BUY AND HOW TO INSTALL A FUEL PUMP THAT YOU SUGGESTED.

ALSO HOW TO UPGRADE TO THE NIKKI CARB YOU SUGGESTED.

I DID PUT IN A KIT AWHILE BACK --
THANKS

Take Jimmy's advice and install the new replacement carb. He walked me thru mine. Runs like new.

ANOTHER CARBURATOR STORY, I HAD TRIED TO INSTRUCT A GUY HOW TO ADJUST HIS DD CARB. DIDN'T WORK SO HE BRINGS THE SUBURBAN TO ME FOR A NIKKI CARB. SWAP, PRICES ON EBAY HAS GONE CRAZY, MAKING THE SWAP TOO EXPENSIVE, WELL SO I DECIDED TO FIX HIS, MAINLY BECAUSE IT WAS THE BEST STARTING ONAN AFTER SETTING DAYS OR WEEKS I HAD EVER SEEN, THE CARB. HAD A MFG.OR REBUILDER TAG WITH 10/97 DATE,HE OR THE PO. KNEW NOTHING ABOUT CARBS.SO KNOW THEY DID NOT CHANGE ANYTHING, FOUND A VERY SHORT LOW SIDE ADJ. NEEDLE THAT WAS ONLY FILLING THE HOLE, NO WHERE REACHING THE ORFICE HOLE, AFTER A GOOD INSPECTIO FOUND A SECOND LOW SPEED ORFICE HOLE DRILLED BESIDE THE ORIGINAL, HOW IT COULD HAVE GOT THERE IS BEYOND ME, BUILT HIM A CARB. THAT I HAD, COMP. TEST.,CHG.INTAKE MANIFOLD, VALVE ADJ., NEW SPARK PLUGS, NOW RUNS AS SWEET AS AN ONAN SHOULD.
HAVE A GOOD ONE
JIMMY

[quote="Georgia SS"]HI
I BELIEVE ABOUT THE ONLY PLACE FOR A CARB. ON A SEARS SUBURBAN 16 OR 18 HP ONAN WILL BE ON EBAY, I HAVE DONE A LOT OF SEARS RESTORATIONS (20) SO HAVE A FAIR IDEA OF PARTS AVALIBLITY AND PRICES. NOT KNOWING YOUR PLANS FOR THE TRACTOR MAKES IT HARD TO SUGGEST THE ROUTE TO GO ON REPAIR. HAVE SEEN SOME NEW OLD STOCK (40YEARS OLD) FOR $200-$300, USED FOR $35-$45 STILL 40 YEARS OLD, WHY NOT USE A REBUILD KIT IN YOURS, IF IT IS FUEL PUMP PROBLEMS, JUST PUT $10-$15 EXTERNAL PUMP, IF YOU WANT TO REALLY FIX YOUR MOTOR MY ADVISE IS TO REPLACE THE MARVEL CARB WITH A LATER MODEL NIKKI CARB.FOR ABOUT $100 CARB.MANIFOLD OR ADAPTER & AIR CLEANER ASSY. THE NIKKI CARB, WILL MAKE YOU AND THE ONAN VERY HAPPY. CAN GIVE MORE DIRECTIONS IF YOU DECIDE TO REPLACE WITH A NIKKI.
HAVE A GOOD ONE
JIMMY
IN SOUTH GEORGIA
Can you please give more information about the Nikki carburetor and manifold the who what when and where of all of it so I can acquire one myself any help would be greatly appreciated.

THERE IS SOME BETTER PRICES ON EBAY NOW FOR THE NIKKI CARBS.& MANIFOLDS, AIR CLEANER ASSEMBLIES ARE NOT SUCH A GOOD BUY, CHOKE & THROTTLE HOOK UP ARE THE SAME, WILL ALSO NEED A $10 FUEL PUMP, GLAD TO PASS ON MY EXPERIENCE FOR I WON'T BE NEEDING IT MUCH LONGER.
THANKS
JIMMY

Thank you Sir for your time, I have a 1978 Sears 18 / 6 Onan powered. I've been through every aspect of the machine at this point and so far the carb has been the biggest issue other than finding original catagory 0 implements. As of you not needing your experiences much longer, I have been retired twice in my life and I've shared knowledge with more people then when I was working, if you are looking at something other than retirement I would say try to get as much of your information online as possible. You could help people for years.
Again, Thank You for your time.
Mark