49CC 80CC 100CC RSE Reed Valve for 32mm - 40MM Intake for Bicycle Engine Kit

The concept is good, but it just doesn’t work in practice. The flaps on the valve are too rigid for the engine to actually suck in enough air and fuel so it lowers the performance of the engine that you put it on and I’ve tried tweaking the carburetor and the most I can go is about 15 miles an hour. I would not recommend this product.