In Reply to: 8N Carburetor posted by Cal Sexsmith on May 11, 2022 at 19:04:43:
Your OEM Marvel-Schebler carb can be rebuilt over and over. New aftermarket models tend to be junkers. Some time ago somebody decided to re-invent the wheel and came up with “new” needle & float valve that now used a clip and controlled the float that way. Why add more parts to a system that worked perfectly fine otherwise? Some say it is a better design, but that is strictly opinion, not fact. New needles usually now use a Viton tipped needle, again, why? Your M’S carb was replaced with the new style. The needle & valve are not your problem if you set the float level to ¼” at the closest point, use a drill or dowel as a gage. First thing is to perform the Fuel Flow Test. Chances are the problem is upstream of the system. TISCO makes the best carb rebuild kit. Use a brass venturii and float.
MARVEL-SCHEBLER CARBURETOR NEEDLE & FLOAT VALVE ASSEMBLY:
AFTERMARKET NEEDLE & FLOAT STYLE:
TISCO MAJOR CARB REBUILD KIT FOR TSX 33 & 241: