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Old 07-17-2016, 09:11 AM   #1
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1999 Mainship Pilot 30 propeller Yanmar 4LHA

Recent purchase of a 1999 Mainship Pilot 30 with a Yanmar 4LHA. Any idea what the original prop was? Boat had a 21 x 21 LH that was in bad shape. Prop shop suggested 22 X 20 LH. Have vibration starting around 2200rpm's. Noticed an article stating the early Pilots had an issue with vibration and noise, corrected under warranty. Shaft was checked, new cutlass bearing and packing gland. Any input would be appreciated.
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Old 07-17-2016, 11:05 AM   #2
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The Mainshippers at the MS Yahoo site have discussed this at length. I would caution re increasing diameter as some of the initial problems had to do with tip clearance and tunnel burn.

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