yes, the SPE engine was my design , see the name. SPE ,mean Shen Ping Engine , it's happend my Chinese name is Shen Ping . in that time I was try to do design this engine at same way mount like DA, I never thought this engine are too much power and viabration , and the leg will broken finally. since my ex-partner get the right to produce and sell it. I have to make new engine ,now it's come out new enging , the MT-42 enging, and the new design have no problem with leg broken any more , and I upgrade this engine to 42CC engine, so the new replacement engine are light than SPE 40 and more powerfull .