What is a boost port?

The original Schuerle patent showed only two ports flanking the exhaust port. It was thought that the velocity of the incoming fuel charge had to be kept high to scavenge to upper part of the cylinder. Someone realized that these two ports were in fact restrictive so a third "boost" port was added just opposite the exhaust port. Many of the early 3 intake port Schuerle engines had the two side ports open 4 degrees earlier than the boost port. Now days most engines have all three ports open at the same time, though they may not all be pointed in the same direction. Please note that small high velocity ports make for nice mellow engines just what a beginner needs. The LA engine is built for the entry market. It is not expected to make power nor is it expected to last much past the learning stage. It is expected to generate lots of profit for OS. OS is not dumb why build a great motor that will spend most of its time digging holes in the ground for the begineer pilot. Now are there better engines out in the market for the same cost? That's another topic!!!
Konrad

P.S.w8ye, I assumed that all intake ports cut into the sleeve flowed from the crankcase cavity. Dead end ports are something I hadn't fathomed.[X(]