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Hey guys new here. I have TB 210 and I hit a rock while mowing. After this incident mower starts and stops. I removed the flywheel and checked the key and it does not look broken. So I put it back. Now when I turn the flywheel manually I feel some resistance after a quarter or half turn. I have never removed a flywheel before so I am not sure if this resistance is normal. there is no blade under the deck can this be the problem as there is no downward weight? I am afraid to crank up the mower as it might break or something. Any advice would be helpful

Remove the spark plug & the rocker cover
When you feel resistance have a look at the rockers
If they are starting to push the valves down then there is the source of your resistance

how long has it been sitting since it hit the rock?

Going to need the engine Model and type(spec) numbers as it considered a separate part of the mower.