The correct plug gap for my Toro GTS 6.5 horse mower is 0.035
You will need to get the spark plug from the manufacturer. You can find out this information by calling them or looking through the users manual.
The spark-plug gap for a toro 6.5 hp self paced walk behind lawnmower is a 0.035 spark plug. You can easily find nice spark-plugs for sale on sites such as eBay.
It is probably a Briggs & Stratton engine. You will need to supply the model number from the engine to get a correct gap.
.030" or .762mm
Champion 5843
Before working on the Toro model 20017 lawnmower, disconnect the spark plug. The drive belt is visible under the mover. Use a ratchet to remove the blade. The drive belt is now accessible and can be easily changed.
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Champion RJ18Y
.030
Tecumseh Part #611049 - Champion Spark Plug #RCJ8Y
Champion RJ19LM will work.