The 'preheater stove' is a piece of sheet metal bolted to the OEM manifold and connected via a flexy pipe to the bottom of the air cleaner. On cold days, a heat or vacuum operated valve on the air cleaner opens to allow this hot air from the manifold (which gets hot faster than any other engine part) to flow into the carb. This prevents carb icing and promotes faster engine warmup. Review the air cleaner illustration at www.sor.com for your model and you'll see what's not there. These can be fabbed onto headers, if you do not have the OEM exhaust manifold.
The best reason to quickly assess the emission situation before driving it is to be sure that unfiltered air is not going directly into your engine.
The best reason to quickly assess the emission situation before driving it is to be sure that unfiltered air is not going directly into your engine.