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NOISY ENGINE?

MY ST220 MAKES A WHISTLING SOUND WHEN OFF THE REVS,THEN GOES WHEN THROTTLE IS APPLIED, WHAT IS IT?
SCOTT, July 2008
sound is induction coming from split/perrished/missing vacum hoses on intake side of engine.usually 6mm-10mm black hoses like small coolant hoses.running ur hand over them sometimes changes pitch and can help find leak.if not its systematic removal till noise changes to find source

caine, July 2008