Have a grizzly 450 that came into shop, no power under load, like in mud, ditches or climbing hills. Cleaned tank, carb, and filter very thoroughly, new plug etc. Customer says it's still doing it, i could never recreate the problem due to lack of area to ride it. Anyone experience this, making me think it's something electrical or even clutch, bike runs flawless and no spits or sputters riding around neighborhood, even opening it up WOT performs perfect unless under load
