Pull the valve spring cover off and rotate the engine by hand while watching inside there. If its functioning correctly, you will be able to see the exhaust valve be bumped open just a little bit during the compression stroke.
While you're in there its a good time to check the valve clearances too, as if the exhaust valve clearance is too large the compression release won't work.
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147 R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)
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