should i spray the powerfoam when the engine is hot or cold
 

i have did the search on how to decarboning the engine with powerfoam
but when i read the direction on the can it told us to warm up the engine and then spary that into the carb or intake
but since i am spraying the foam directly into the spark plug hole should i warm up the engine first?
plz help thx

hot or cold, it's your choice.

I would suggest you let it soak over night, hot is better because it speeds up the solvent reaction but do it slow, things dont like to go from hot to cold too fast. BTW you may carbon foul a plug so keep some extras around

thats interesting. where can i get that powerfoam, is it special foam for rotary or can i use sprays for regular piston engines in rotary? and how many miles will the car drive before it needs decarbonation again (I have FD)