plug gap for toro ccr 3650 is .025
.30 gap
The correct plug gap for my Toro GTS 6.5 horse mower is 0.035
.025
Autolite 458
.030" or .762mm
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.
Toro Briggs & Stratton 6.0 77-7330 relace with: Champion RC12YC .030 gap
I've still got my users manual - it says the gap should be 0.030" (0.76 mm).
You will need a Champion RJ18YC/130-435 spark plug. Gap it to .30. You can buy them here: http://www.jsesc.com/
It is probably a Briggs & Stratton engine. You will need to supply the model number from the engine to get a correct gap.
For most small 4 cycle cylinder engines using a magneto and a coil to provide electricity to feed the spark the gap is .006 to .010.