I had a similar issue with my 29mk2 with Yanmar 2GM. Turned out it was the
transmission slipping. I suspected my Flexofold prop at first, and eventually
discovered that pushing the shifter hard down helped, before having a mechanic
aboard who immediately recognized it as the transmission. All better now since
having it rebuilt. Adjusting the shift cable may help as well.
Derek McLeod
Aileron, 1983 29MK2
Toronto, ON
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