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    Engine howl at 3500 rpm and above

    Had the bike (80 650 special) for years, just recently i started to get a howl (about a 300Hz tone) at 3500 rpms and above.., engine runs fine at idle and all the way up to that point. Howl seems to dissipate in a right hand bank.. I have checked in different gears and the howl always starts...
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