Yes investigate it before striping the engine .
Do some other checks.
Check the reeds if any is broken or if they have stuck.
Also a vacuum test will help to find if a crank seal is leaking.
I wish you good luck.
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Owner of : Honda NSR250 MC28 95sp colours / Honda NSR250 MC18 R6K SP / Honda RS250 NF5 89 in boxes
/ Honda C50 12V cub / Honda C50 12V super cub Japanese version /Yamaha XT600 89 benetton