These can suffer with compression loss if left sitting for a while
Can be rectified fairly easily most times
Take the plugs out and put a tablespoon of 10/40 or 20/50 if you can get it down the bores.
Spin it over with the plugs out.
Repeat with the oil and put plugs back in
Try starting it.. The Lifters may rattle if it goes but this should return to normal with time.
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