Check valve function will increasingly diminish

To ensure the oil pump in the stationary state does not leak, the oil pump in the oil port at the installation of a check valve structure design. With the use of time and the oil pump check valve spring force continue to decline, coupled with the gradual  Instrument needle valve  body within the oil, check the function will become increasingly diminished, the engine does not work, there is still oil from the oil tank through its check valve slowly leaking into the carburetor float chamber. The design of the engine, pump valve leakage trace is allowed process, but there are certain limits. Once the leakage oversized, when the motorcycle  Valve manifolds  is too long, the oil pump check valve from leaking out of the oil will be overflowing carburetor float chamber, causing difficulty in starting the engine. Barely started, which emit large amounts of blue smoke muffler, leakage serious, and even cause the engine to fail to start.