I've still got my users manual - it says the gap should be 0.030" (0.76 mm).
Mine has NGK BPMR4A
dont know just got mine but it had a champion h10
http://www.toro.com/home/customercare/interactivemanuals.html Snowthrowers Single Stage Snowthrower TOC Maintenance Spark Plug Conditions Page down to Replacing a Spark Plug
how to replace plug wire on a toro mower
1.7 degrees.
Champion RJ18Y
.030
Tecumseh Part #611049 - Champion Spark Plug #RCJ8Y
plug gap for toro ccr 3650 is .025
Champion RJ19LM will work.
Get a spark plug socket and wrench that fits the plug body and remove it by turning counter-clockwise.
The correct plug gap for my Toro GTS 6.5 horse mower is 0.035