Yamaha Star V-Max VMAX Motorcycle Discussion Forum

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  • My "89 Max has jet kit and a kerker exuast.The max is now sluggish after installing COPS(denzos from "02 GSXR750 w/1.5 ohm 25watt resisters.New NGK plugs gapped at .25.There is consistant spark to each plug.Startup and idle are fine ,air/fuel mix is as well.Max power seems to be @ 60%.Any suggestions?
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