As long as the cylinder still holds compression, Yes, B-12 Chemtool Carburetor, Choke & Throttle Body Cleaner (part #0113, #0117 & #0120) can be used in such a manner. Extended soak times are not required either. (You won’t clean anything in 60 minutes that you didn’t clean in 15 minutes.) One word of caution: do not use B-12 Chemtool on a hot motor—excessive heat will boil off the active solvents and render the product less effective. The ideal cylinder temperature range is about 60 to 80°F or as high as 90 to 100°F if you thread the spark plug back in.