Bobby J Hughes
The disadvantage of no peripheral exhaust port.
Just take out the plugs and let it sit for a while. If the engine has low compression or low compression with the oil washed off of everything, a shot of engine oil in each housing will help with heat of compression or WD-40. In winter I have used several shots (from a pump style oil can) of engine oil and 1/2 cup of hot coffee in each housing. Starts right up. Lots of white smoke, but it clears up once it burns out of the muffler. You can start a junk engine with no compression at all with this method.
Lynn E. Hanover