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the crankcase drain channels diverts crankcase juice to the purge valve and out the back end… not certain using the air nipple would do it properly since it sits above the purge valve. The resulting loss of pressure normally built up in a two line tank would also reduce crankcase pressure possibly affecting engine performance …which is why we plug it in the first place .
I tried finding a utube on it and did a search here to no avail. May have been an OUTBOARDER article some time ago ?? can’t recall. it basically involved blocking the purge drain and adapting a cover/nipple on the purge then sending juices back to a bottle.. juices build up at lower speed … at high rpms the fuel oil mix does not accumulate so much being pushed into the cylinders.
up to you… depending on how bad things are… did you try adjusting the carb . both cylinders working properly all at speeds ???
Yes, both cylinders working properly and the engine runs smooth. Both sparks plugs have the same color.
I’ll have another go this weekend and see if adjusting the carburetor helps.