Just changed my plugs and the front one was smut black,no biggie I did not know how long it had been in there. The rear looked better but not pretty and clean ,you know what I mean. ANYHOW put in the new plugs and ran it around the yard less than 2 mins and checked the front again brand new and smut black. I did not do a full throttle chop so I do not really know if it loaded up on idle at shut off. I have no idea what jets or needle postions I have either. any pointers?
You should warm up the engine and then do a full throttle run.Shut off the ignition as you let off the throttle and stop right away or atleast put it in neutral so the engine doesn't spin with no spark.Now check the plugs.This will tell you how your main jetting is.Just driving around the yard you are using your slow speed jet and your idle mixture screw adjustment so you won't be able to tell your jetting.If the plugs are fine at full throttle and your plugs are black at low speed then it could be a few things.Either your slow speed jets are too big,your idle mixture screws are way out of adjustment ,or your choke plungers are stuck partially open.I have been reading about the choke plunger problem alot lately.
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