If you truly only sprayed the clutch with brake cleaner and didn’t touch the spring adjusters, the clutch should be fine. Did you use the recommended tools to pull the clutch and reinstall it? I’d pull the clutch again to see if anything has broken. Revving the engine on the stand is not going to give you an accurate indication of when the clutch locks up and the engine should rev way past 10k.
If it’s not the clutch, you could have an engine or carb issue, or you have too small of a gear on the axle. If you keep running down the street having smoke coming off the clutch, stop doing both. Over heating the clutch is going to shorten the life span of the friction discs, floaters and springs.
LAD Specialties customer / tony kart / rotax / kt100