I started my sled today and I didnt notice it sounding weird or anyting. Then I let it warm up for a while. When I came back out it was sounding weird ( kinda like a 4-stroke) and the oil light came on. So I looked and I still had plenty but I filled it up anyway. I took it 1 mile down the ditch and after I would open it up it didnt seem to sound weird. My brother was riding next to me and I drove it into the garage and he said it sounded weird too. So I let it sit for an hour or too then I checked everything. The anti freeze looked a little low. I started it up and it still sounded weird. I pulled out the plugs and one of them is white and the other looks normal color but has (idk what it is looks kinda like really small metal or somthing) on the end.