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We have operated an early 90s (1990ish) 18hp Craftsman II with 44 inch deck successfully for about 12 years now on a ranch property and it has rarely given us any trouble. It is well maintained and last year while servicing and giving everything a thorough cleaning, I sprayed some carb cleaner down the air horn and it seemed to run a little stronger after.
However when I returned it to the ranch I noticed it started this quirky rolling surge of RPM, and I can see the governor arm moving in and out to compensate for the throttle position or something as it rolls up and down like a race engine. Does not do it under a load mowing at WOT, only while trying to idle or cruise around at lower throttle position. Fuel filter looks clean, but there is this little square box in line with the fuel line (not sure what that is), and I have never tried to remove the carb or rebuild it or anything.
Anyone else experience or recognize this symptom?
thanks
However when I returned it to the ranch I noticed it started this quirky rolling surge of RPM, and I can see the governor arm moving in and out to compensate for the throttle position or something as it rolls up and down like a race engine. Does not do it under a load mowing at WOT, only while trying to idle or cruise around at lower throttle position. Fuel filter looks clean, but there is this little square box in line with the fuel line (not sure what that is), and I have never tried to remove the carb or rebuild it or anything.
Anyone else experience or recognize this symptom?
thanks
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