If you have the OEM tool bag, pull the rear wheel. Inspect the cushions as mentioned before and look at the hubs bearing, confirm all spacers are present and the wheel bearings are smooth when pressure is applied and rotating them.
Next thing: No tools eh. OK, all we can do is diagnose; clean the front sprocket, nut, and shaft (brake cleaner). Apply some paper white out, make a THICK stripe across all three items in like 3 places (from the center of the shaft over the nut and onto the gear. After it dries, take it for ride and see if the relationship between the lines changes or if it cracks at the joined areas due to rotation.
I would also find something that will draw a VERY FINE STRAIGHT LINE ACROSS THEM ALL. An index just in case the white out cracks for the sake of cracking. Heck, tape may even work as it could show a twist or deflection when spanned across the shaft and sprocket.
If nothing comes of the rear wheel or the sprocket, I'd REALLY OPT FOR CUTTING OPEN THE OIL FILTER!
Also, are you sure the rear shock bushing isn't knocked out of the bottom?
Next thing: No tools eh. OK, all we can do is diagnose; clean the front sprocket, nut, and shaft (brake cleaner). Apply some paper white out, make a THICK stripe across all three items in like 3 places (from the center of the shaft over the nut and onto the gear. After it dries, take it for ride and see if the relationship between the lines changes or if it cracks at the joined areas due to rotation.
I would also find something that will draw a VERY FINE STRAIGHT LINE ACROSS THEM ALL. An index just in case the white out cracks for the sake of cracking. Heck, tape may even work as it could show a twist or deflection when spanned across the shaft and sprocket.
If nothing comes of the rear wheel or the sprocket, I'd REALLY OPT FOR CUTTING OPEN THE OIL FILTER!
Also, are you sure the rear shock bushing isn't knocked out of the bottom?