Hey guys. New member here. My name is Ryan and I ride a 98 YZ 400F. My bike wouldn't fire up for me a few weeks ago, so I changed the spark plug and that did the trick. I took the bike for a quick run around the yard to be sure everything was fine and I had no issues. I went out again today to see if it'd fire up and the kicker won't budge. The shifter won't even go into Neutral. Next I pulled the plug and the kicker still won't budge. I'm guessing that with it being cold out lately, there's a slight possibility that the cylinder wall could contract against the rings, preventing the piston from moving freely? I've never seen it happen, but just a thought.. Also, could the kicker gear cause this, even though I shut the bike off when everything was fine? I know this isn't due to any sort of internal engine failure, since it ran fine with the new plug. This bike has excellent compression and runs really strong. The decomp lever is doing nothing for me here either. Any help would be greatly appreciated. Thanks.