I have a 2000 Trail Blazer 250. I confess that previously the cooling fan thermostat failed and the engine "seized". After it cooled down it ran fine and I wired the fan to the low beam light switch to turn it on manually. I was using the ATV to pull a drag around the property. The engine slowed down gradually and then stopped. I plan to check to see if there is spark, air and fuel. It appears that I have to remove the fuel tank to get to the spark plug. I did find two small plastic tube that come up from somewhere in the engine compartment and go down the handle bar center tube. These tubes are hard and brittle and are broken. I plan to replace them, but I wondered if the thought is that these could be the problem.