The newer manual specifies a spark plug gap of .035" for "battery/breakerless" systems, & the older manual specifies a gap of .025" "for gasoline." Which is correct & why the difference? #2. Agreed about trusting the engine manual over Cub Cadet's. Out of the 3 gap choices that I shared, from the Kohler manual, would I go with "Battery.. Always refer to the appropriate product Operator's Manual for exact specifications and additional model specific service information when replacing spark plugs. Replacement spark plugs are available at our Online Parts Store. MTD Spark Plug Substitutions: If necessary, you may replace an MTD # 181765 spark plug with a Champion® RCJ6Y. If.
Page 1.6 of a Kohler Service Manual in the ignition section (spark plug gap) says the following: Battery ignition-.035 Magneto-.025 gaseous fuels-.018 My Kohler service manual is at least 20 years old. I would go by what the service manual says rather than what the Cub Cadet manual says.. Use a spark plug wrench and turn counter-clockwise to remove the old spark plug from the mower. Step 3 - Change the gap on your spark plug. Check the gap on the new spark plug and use a specialized gap tool or a set of feeler gauges to adjust the gap between the electrodes to the appropriate distance as referenced in your operator's manual.