My JD 336 did this when I got it, the twine disk tension and timing were out. My early knotter doesn't appear to have adjustable twine disc timing like shown in the manual so I left that.
I also had to set my needles closer to the twine disc than the manual says, I think the needle frame bushings are a bit loose and it would hang the twine in the wrong spot for the twine disc to pick up.
I've baled almost 50,000 bales since those adjustments with only knife sharpening and needle brake adjustment.
Plastic or sisal doesn't matter although my 336 when it was having this problem.
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