I have been given a mower engine which I think is a Suffolk Super Colt (75G14-25A), I have spent many hours trying to get it to run. I think I have solved most of the problems but the carburetor is still causing me problems. I see on ebay there are replacement carbs for models 30 and later is there a replacement carb for the 25A?The problem is that when I do manage to get it to start it will only run for a few seconds. The carburetor was badly corroded and every thing was seized, I have cleaned it out, heated it up and managed to free off adjusting screws and jet, flushed it through, fitted new gasket and set up per instructions The engine had been sat in a yard in all weathers, magneto/capacitor has been replaced and now has a good spark, points cleaned and adjusted.This forum has been a mine of information regarding the carburetor but my patience is begging to run out, what are your thoughts please. Before you retrace your steps in the carburettor check the fuel flow from the tank by pulling the pipe off the carb and letting it flow into a suitable container for a full half minute.
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If it continues for that time without faltering that is fine, but if it slows down check the tank cap breather hole and the tap filter gauze.If the flow is ok you will need to strip the carb and ideally have it ultrasonically cleaned, but try another thorough clean with a proprietary carb cleaner. However if the carb has suffered internal water related corrosion it is possible that its beyond saving. On the bright side there are plenty of suitable Zenith carbs to be had for reasonable money.Just a thought, did your cleaning extend to removing the slow running jet/tube?
STROMBERG NA-S3A1 CAR BU RE TOR OVER HAUL MANUAL. With intake silencer or Without intake silencer. Single Carb or Dual Carb. Jet Needle O Ring. REPLACEMENT PARTS. TC, TCA, Cessna.:175, 185, 188, Grumman.: AA-1, Lake.: LA-4, A, P, Maule.: M-5-180C.
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March 2023
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