| 摘要 |
The present invention seeks to provide a simple, low cost and easy-to-install (or remove) device for two-cycle engines which improves engine efficiency through more complete combustion, resulting in increased engine rpm and a decrease in emissions. The invention specifically relates to an insert device which is located upstream of the carburetor, preferably in a coupler which typically extends between an air cleaner and the carburetor of a two-cycle engine. The insert itself is generally formed as a tubular member (of one or more pieces) tapering from a larger inlet side to a smaller outlet side, with or without surface irregularities, i.e., ribs, flutes, etc., formed on its interior surface. It is important that the tuned air insert be located such that its lower edge, i.e., on the outlet side, be raised above the coupler outlet and carburetor inlet, and that the coupler surrounding the tuned air insert have a diameter sufficiently greater than that of at least a portion of the insert, so as to create a chamber surrounding the insert, immediately above and open to the carburetor inlet.
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