Vacuum pressure testers cam correct crankcase vacuum pressure tester.
Crankcase vacuum tester.
Not wanting to replace the cover i ordered the pcv valve replacement from ecs.
After my local mechanic did a smoke test and checked the vacuum lines he suggested that the issue might be the pcv valve in the cover.
Next pull a vacuum on the crankcase and see if that holds.
Azuno compression tester kit 2nd generation digital compression gauge 200 psi with adapter hose 8 pcs set deluxe case petrol engine small engine cylinder compression tester 164.
He verified this by doing the above linked test which showed no crankcase vacuum at idle.
Always gently rotate the crank in each direction to disturb the seal lips and verify that they hold under vacuum.
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There is some argument about whether to do vac first and pressure second or pressure first and vac second.