I don't think your whistling is related to your chain adjustment. What else might be whistling ... helmet ... ???Did you change anything else? Was your chain loud before and possibly covered the noise you are now hearing?
SOURCE: slapping noise after chain adjust
Honda owners manual chain adjustment should be 5/8'' to 1''
SOURCE: noise in trans or in primary chain
It sounds like the primary drive chain is loose. The way I adjust mine is to take off the upper left inspection cover, start the bike and slowly tighten the adjuster until it starts to wine, then back off until it stops. Rev it slowly and listen for a wine. No wine good to go.
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Its coming from somewhere around my left boot. I have a 2002 Honda shadow spirit 750.
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