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.
Crankcase vacuum tester.
The adapter supplied are 10mm 14mm be sure to check out my ebay store for more parts and accessories.
Test kit for testing crankcase pressure vacuum leaks in 2 stroke chain saws trimmers blowers 2 stoke equipment must use a vacuum pressure pump with the rubber block offs and adapter note.
The morning i went out to replace the pcv.
He verified this by doing the above linked test which showed no crankcase vacuum at idle.
There is some argument about whether to do vac first and pressure second or pressure first and vac second.
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.
Always gently rotate the crank in each direction to disturb the seal lips and verify that they hold under vacuum.
Price 19.
Next pull a vacuum on the crankcase and see if that holds.