Download video: STG 87cc Big Bore Stroker w/ Large Valve Head idling SCOOTERS TO GO
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This is the STG engine idling. You may notice a little more noise and vibration out of this engine, and it is to be expected. These engines have a larger displacement, both bore and stroke, so there is a comfortable vibration while they idle. They also make more noise because of the high compression, larger bore, and longer stroke. The STG engine should have a more "throaty" noise coming from the carburetor and a deeper/more-poppy noise coming from the exhaust.